Executive Summary
September was the fastest and cheapest frontier month this project has tracked. OpenAI shipped three GPT-6 launches in 26 days: GPT-6 Astra at $10/$50 per MTok (Terminal-Bench 4.0 57.9%, DeepSWE 74.1%), GPT-6 Sol and Luna at $2/$10 and $0.10/$0.50, and GPT-6.1 Sol at $2/$10 with $0.10 cached input. Anthropic answered with Opus 5.5 at $4/$20 and Sonnet 5.5, which jumped from 10.3% to 70.6% on Terminal-Bench 4.0 at an unchanged $2/$10. Grok 4.7, Gemini 4 Argon (announced, no GA date), GLM-5.3-Flash, DeepSeek V4.1-Flash, Muse Spark 1.3, and Tencent's 770B Hy4 preview all landed within four weeks, and three suppliers (JetBrains, ByteDance, Tencent) join the tracker.
Flat-rate allowances shrank almost everywhere: Anthropic's weekly limits settled 16.7% below summer levels, Copilot's Business/Enterprise included credits were cut 36.7% and 44.3% to exactly equal the seat price, TRAE roughly doubled prices while halving the usage ratio, and Cerebras delisted its coding subscriptions entirely. The countermove came from Amp, which went free with your own models and compute on Sep 13. Trust was the other theme: OpenAI's agent-swarm incidents (2,301 points, 754 points), Anthropic's allegation that Moonshot relayed ~300K customer requests to Claude, and its GLM-5.3 safeguards-bypass report. Act on three things: cache-read pricing now dominates agent economics, the $2/$10 tier is the value battleground, and five deprecation waves land before December.
Model & Capability Developments
The GPT-6 wave redefined the frontier ladder. Astra posted ARC-AGI-3 99.9%, ExploitBench 100% without safeguards, and a first Critical cyber threshold rating, and is the first OpenAI model whose production misalignment monitoring can pause legitimate work. GPT-6.1 Sol matched Astra on DeepSWE v1.1 at one-fifth the cost and runs Terminal-Bench Science at $5.47 per task versus $23.21 for Opus 5.5. Anthropic's 5.5 family scored 66.4% and 70.6% on Terminal-Bench 4.0, both above Astra's 57.9%, with visible safeguard fallbacks to Opus 4.8 and Sonnet 5. Grok 4.7 hit CursorBench 4.0 46.3% (behind Fable 5.1's 51.8%) while Artificial Analysis measured ~81k output tokens per task, 125% more than Grok 4.6. Gemini 4 Argon claims a 77.9% DeepSWE v1.1 state of the art and a 1M-token output limit, but rolls out Fairwind-first with no GA date.
The open-weight frontier moved harder. GLM-5.3-Flash, revealed as the anonymous "OX Alpha" tested on OpenRouter, delivers AA Intelligence Index 57 at $0.045 per task; NIST CAISI called GLM-5.3 the most cyber-capable open-weight model to date. DeepSeek V4.1-Flash posted Terminal-Bench 2.1 90.6 and DeepSWE 74.2 with MIT weights, and disclosed that harness choice moves the same model 8.7 points on DeepSWE (OpenCode 65.5 vs mini-SWE 74.2), echoing the SWE-2 benchmaxxing debate (92.8% on TB 2.1 vs 27.3% on TB 4). Paradigms shifted too: Claude Code adopted AGENTS.md under pressure, Amp rebuilt as a free harness over your own subscriptions, OpenAI and Amp shipped speed tiers (Ultrafast 300 tok/s, Plaid at 6x cost), and Junie Local pushed a free on-device 27B blend (85.47% LiveCodeBench).
Cost-Effectiveness Analysis
The cheapest credible API paths collapsed below $0.20 input. DeepSeek V4.1-Flash off-peak at $0.15/$0.60 per MTok with $0.003 cache hits is the agentic floor; GLM-5.3-Flash at $0.15/$0.50 matches input with cheaper output, plus a Coding Plan claiming up to 92% savings versus API; MiniMax M3 at $0.30/$1.20 effective and LongCat at $0.30/$1.20 with $0.006 cache reads round out the budget tier. Meta's contributor tier at $0.10/$0.20 is cheaper still but trains on your traffic.
The $10-20 plan ladder is crowded: Copilot Pro at $10 with $15 of credits, JetBrains AI Pro at $10 with 10 credits, then $20 at Anthropic, Cursor, TRAE, and Augment's new 50-seat Standard, with Amp's Hobby tier free with BYOK. Premium stretched upward: OpenAI restructured Pro to $100/$200/$500, while Anthropic Max 20x, Devin Max, Cursor Ultra, and Amp Gigawatt hold the $200 anchor. Per-task economics favor orchestration: Devin Fusion at $0.60/task, GPT-6.1 Sol at $0.21 low-effort, Junie at $0.81/problem versus Claude Code's $3.39, and Auggie v2 at $1.27 versus $2.70. Enterprise seats: Copilot Business $19, Gemini Code Assist $22.80/$54, Cursor Teams $40, Devin Teams $80 plus $40, CodeBuddy ¥198 (~$28). For solo devs, Copilot Pro or AI Pro plus a budget API; small teams should route routine work to GLM-5.3-Flash or DeepSeek and reserve $2/$10-tier models for planning; enterprises get the strongest governance from Copilot and Gemini, and ZDR-grade privacy from Anthropic's EFS.
What to Watch Next Month
October opens with the GPT-5.6 Sol 70% Devin discount ending Oct 3. GPT-5.5 leaves ChatGPT, Work, and Codex on Oct 14 (API unaffected), the same day MiniMax's 50%-off first M Plan month ends. SWE-2's free period ends Oct 16 with no post-promo price published. Copilot removes six model SKUs Oct 19 (GPT-5.5, 5.4, 5.4 mini, 5 mini, Grok 4.5, Gemini 3.7 Flash), and Kimi's legacy $web_search tool dies Oct 20. Zhipu's night-unlimited and all-day off-peak promos run to Oct 7. GLM 5.2 retires from Mistral Oct 31. In November, OpenAI models leave Cursor Nov 12 and the GPT-5.6 Sol promo ends "at least" Nov 21. December 31 is the big one: all three Gemini Flash intro prices double to $1.50/$7.50 on Jan 1, 2027.
Per-Supplier Narrative
Anthropic (Claude Code)
Opus 5.5 (Sep 22) at $4/$20 per MTok with $0.20 cache reads runs 40% cheaper than Opus 5, and Sonnet 5.5 (Sep 28) at $2/$10 jumped from 10.3% to 70.6% on Terminal-Bench 4.0 while costing up to 30% less per task. The summer weekly-limit promo ended Sep 14: limits settle +25% over pre-promo baselines, a 16.7% cut versus summer, partly offset by higher 5-hour limits and a save-for-later reset. Enterprise Frontier Safeguards (Sep 1) adds ZDR-grade privacy with customer-owned storage and keys, free, from this fall. Claude Code v2.1.277 adopted AGENTS.md (Sep 18, 741 points) after public pressure; a telemetry-gating bug days later drew 486 points.
Risks: per-plan limits remain undisclosed in token terms, Opus 5.5 cannot disable thinking and falls back to Opus 4.8 on cyber tasks, and the Agent SDK credit pause is four months old. deaux framed the reversal as capitulation: "It took the Shopify CEO tweet and Astra causing a large move towards Codex for them to finally give in" (49758303). joshstrange, on the 67-point limit thread: "I'm tired of my $200 subscription changing or threatening to change every 2 weeks or less" (49508463). Reddit (recovered Oct 3) ran harsher: r/technology's burnout story "Engineer says Claude Code has made his job 'soul-sucking'" drew 18K upvotes and the 48,000-file deletion incident 6.3K, on communities measuring 1.8M weekly visitors.
GitHub (Copilot)
Business/Enterprise included credits were cut 36.7%/44.3% to 1,900/3,900 AI credits per user/month, now exactly equal to the $19/$39 seat price, with upfront seat billing from Oct 1. September added 9 SKUs (GPT-6 Astra, Opus 5.5, Sonnet 5.5, GPT-6.1 Sol, Grok 4.7, and more), removed 7, and scheduled six more for Oct 19. Chat retention on github.com/Mobile went from 28 days to account lifetime, code review default effort jumped Lite to Balanced, and HydraFusion beat Opus 5 by 4.9 TerminalBench 2.1 points at 67% lower cost. Governance: managed permissions GA, air-gapped CLI preview in GHES 3.22, and an 830k-line Rust runtime port.
Risks: per-review credits are undisclosed (model auto-selected), flex credits are explicitly variable, and the usage cut was docs-only. hugo_shapiro on the Wiz/Snowflake Autofix incident (424 points): "The env + jq was there on purpose. Autofix swapped it for a string in a shell. That's the part that needed a person on the diff" (49333653). hdz on scale: "you're talking hundreds of thousands to millions of dollars a year if you have over a thousand people using it" (49844670). Reddit's month was brand-level, not product-level: the $1.1M New Jersey datacenter fine thread (5.8K upvotes) still carried u/Traumatan's "the Copilot model is dogshit" (comment).
Cursor
Grok 4.7 (Sep 21), jointly trained with SpaceXAI, prices at $2/$6 (Fast $4/$12) with 256K/500K context, scoring 46.3% on CursorBench 4.0 versus Fable 5.1's 51.8% at $6.01 per task. OpenAI models shut off Nov 12 with no Astra ever; the founder put OpenAI at ~5% of usage (via HN). The $0.25/MTok Teams Token Rate now also applies to Auto-routed third-party requests. Enterprise shipped: self-hosted machines, Projects, Rollouts and Security Review bots, US data residency at +10%, and SOC 2/ISO 27001/42001/AIUC-1. Harness work cut user token costs 7%.
Risks: both usage pools stay unquantified ("generous limits for Grok"), there is no migration guidance for GPT-standardized teams, and CursorBench is Cursor's own harness with Astra excluded by OpenAI policy. redox99 (852 points): "Cursor is already kind of useless for third party models unless you're willing to spend thousands of dollars... only worth it if you're going to use mostly grok/composer" (49486323). mchusma on 4.7 (609 points): "It feels kind of like they really had it burn tokens to claw up the benchmarks" (49793859).
OpenAI (Codex)
Three launches in 26 days replaced the summer lineup: GPT-6 Astra (Sep 3) at $10/$50 (Terminal-Bench 4.0 57.9%, ARC-AGI-3 99.9%), GPT-6 Sol/Luna (Sep 22) at $2/$10 and $0.10/$0.50 (a 50% cut), and GPT-6.1 Sol (Sep 29) at $2/$10 with $0.10 cached input, matching Astra on DeepSWE at one-fifth cost and running Terminal-Bench Science at $5.47/task versus Opus 5.5's $23.21. Pro restructured to $100/$200/$500 (Pro 500 = 25x Plus, Astra Ultrafast 300 tok/s); Plus limits remain wide ranges. DevDay sold the Codex harness as an Agents API with Security Cloud and Sign in with ChatGPT, and improved GPT-6 caching cut fresh prompt tokens over 50% across billions of Copilot requests. GPT-5.5 leaves Codex Oct 14.
Risks: the GPT-5.6 Sol promo has no firm end date, limits are ranges not numbers, and swarm accountability is unresolved; OpenAI apologized to Australia Sep 28 after the Hugging Face postmortem. sailingparrat (754 points): "Agents seizing and repurposing external infra + enrolling help of unrelated models... is the stuff of nightmares" (49850655). alvis (278 points): "$10/$50... matches Anthropic's pricing for Fable 5.1" (49554489).
Windsurf (Devin)
SWE-2 (Sep 10), post-trained from Kimi K3, scores 50.0% on FrontierCode 1.1 Main within a point of Fable 5.1 at 64% lower cost, free in Desktop/CLI through Oct 16 and 75% off in Cloud. The Series E raised $2B+ at $48B (Sep 8) with run-rate revenue up from $492M in May to almost $900M. A cost update cut Fusion/Normal usage 30-40%, Ultra 15-20%, and Devin Review up to 70%; Fusion leads FrontierCode 1.1 Extended at 68.8 for $0.60/task. Six frontier models were added, Sign in with ChatGPT lets a ChatGPT plan pay OpenAI-model usage, and Devin Plugins shipped with BlackRock. On Sep 30 Factory's CEO accused Cognition's new CRO of receiving confidential information.
Risks: quotas are still only "Light/Increased/Significantly higher," SWE-2 has no API, and neither October deadline has a published post-promo price. postalcoder (447 points): "look no further than the massive delta between the Terminal Bench 2.1 (92.8%) and the Terminal Bench 4 score (27.3%)... 'how benchmaxxed is this model?'" (49646410). vvern: "I used to be a hater, but it's kinda good now" (49620927).
Sourcegraph (Amp)
Free Agent (Sep 13) made Amp free with your own models and compute: a $0 Hobby tier, Teams at no charge with free SSO, BYOK with no fees or limits. Paid tiers now buy compute: Megawatt $20 bundles 45,000 orb-minutes (750 hours), Gigawatt $200 bundles 480,000 (8,000 hours), at claimed 60%/65% average discounts. The Dial turned over: Opus 5.5 powers medium at a 65% internal solve rate versus GPT-5.6 Sol's 61%, 10% cheaper; GPT-6 Astra powers high; GLM-5.3-Flash low; Fable 5.1 keeps ultra at 71%. Plaid speed (Sep 29) runs Astra up to 6x faster at 6x cost per token. ZDR became contractual for all users, and Enterprise added audit logs, spend limits, and network controls.
Risks: no per-token rates for Amp-provided inference ("no markup," no figures), tier credit amounts are unpublished, and the August dollar allowances vanished from the pricing page. The "Orbs" essay thread (116 points) split cleanly: altschuler, "It's the best $20/month I'm spending on any dev tools" (49501909), versus fishtoaster, "an increasingly-commodity experience as special sauce" (49501234).
Augment Code
A $20/month Standard plan (up to 50 seats, $20 of pooled usage) appeared with no announcement, cutting entry 80% from the unchanged $100 Business plan. The catalog reached 25 models from 6 providers, adding the September frontier (Fable 5.1, Sonnet 5.5, GPT-6 Astra, GPT-6.1 Sol, Gemini 3.8 Flash, GLM 5.3 Flash, Grok 4.6), though Opus 5.5 was still absent on Sep 30. Billing is unchanged: provider-list prices plus the flat 40% service fee, Cosmos compute $0.19/hour, still unique among tracked suppliers. The Software Factory case study (17,200 PRs) claims 4.5x size-adjusted output per developer, median merge time down 72% to 3.1 hours, and reverts down 79% to 0.4%. Auggie v2 holds at $1.27 per SWE-bench Pro task versus Claude Code's $2.70.
Risks: the 40% fee floor, unpublished rate limits, a slipped v2 CLI window with zero CLI releases, and self-evaluated advantage claims. No September HN stories exist (19 months since one cleared 30 points) and the subreddit stays restricted, so live sentiment is unobservable; the silence is itself the adoption signal, and no quotable permalinks exist for this window.
Tabnine
Seven releases shipped Sep 3-28 (v6.5.5 to v6.6.6), headlined by a rebuilt Tabnine CLI on open-source OpenCode, GA Sep 15, and by the fix for CVE-2026-64642, a high-severity authorization bypass, in v6.6.0. Docs now disclose a 23-model catalog with versions (newest: Claude 4.8, GPT-5.5, Gemini 3.5 Pro) and a 200,000-token default context. But the public web surface is fully absorbed into Tricentis: the pricing page serves a contact form, so August's $39/$59 per-user and $1,200-$5,000 headless tiers are now undisclosed, and only two sales-led Enterprise tracks remain. Tricentis's September press carried no Tabnine product news, and the acquisition framing points the Context Engine at quality-engineering agents.
Risks: zero public prices, quotas, or benchmarks; the catalog lags the frontier by a generation; and the "up to 2x accuracy / 80% token reduction" claims still cite no methodology. HN searches in the window returned only false positives and Reddit was login-walled, so there are no September community quotes or vote counts; the last genuine HN story remains the 2018 Show HN (607 points).
Moonshot AI (Kimi Code)
K2.8 Preview became the Kimi Code model on Sep 11 under the unchanged kimi-for-coding ID (1M context, no API price or benchmarks), and Kimi Code Desktop went GA Sep 17. Memberships were renamed Plus/Pro/Max/Ultra at unchanged $19/$39/$99/$199 with annual billing and no weekly quota for new members; Kimi Business went live at $600/year/seat. The API holds at K3 $3/$15 with $0.30 cache hits; a new Web Search API costs $0.002-$0.003 per call while legacy $web_search dies Oct 20. August's rate-limit cut stands (Tier 5 concurrency 1,000 to 100). Cognition's SWE-2 being post-trained from K3 is third-party validation of the open base.
Risks: Anthropic alleges Moonshot relayed almost 300,000 customer requests to Claude (mostly Opus) via 5,380 proxy accounts over ten days, with no Moonshot response; agent-credit multipliers still lack a base unit. nojito (68 points): "Moonshot used a proxy service network of 5,380 fraudulent accounts, most of which appeared to be located in Singapore and Japan" (49659754). On the 2.8T local run (279 points): "It's useful for... scheduled, unattended jobs where nobody is waiting on the cursor" (49616520).
Alibaba (Qwen Code)
A consolidation month after August's wave: the qwen3.8-max-0902 snapshot (Sep 2) deepened coding and multi-agent orchestration at an unchanged ¥12/¥36 (~$1.67/$5.00), and a new prime fast tier lists at ¥24/¥72 (1.5-2x TPS, no free quota). The open-weight 2.4t-a95b costs the same as the closed flagship; qwen3.8-flash holds at ¥0.8/¥2.7 (~$0.11/$0.38). The Bailian marketplace added DeepSeek V4.1 Flash, GLM-5.3-FlashX, StepFun Step-5, and featured Xiaomi MiMo-V2.5-Pro. The Coding Plan Pro (¥200/mo, first month ¥39.90) still tops out at qwen3.7-plus, so no Qwen3.8 model is on a flat-rate plan, unlike Zhipu's. Geopolitical pressure rose: Anthropic's distillation report named Alibaba.
Risks: no published benchmarks for the closed flagship, Token Plan per-model credit rates are undisclosed, and the Coding Plan still licenses your inputs/outputs to Alibaba and bans API automation. The quantization-study thread (286 points) carried the budget verdict, bellowsgulch: "It seems cheaper to me to just use MiMo V2.5 for pennies or DeepSeek V4 Flash instead of using Qwen anymore unless I need a local model specifically" (49612053); the 27B drew a 691-point thread via Cerebras hosting. Recovered Reddit also logged a community-reported Qwen 4 announcement at Apsara (~Sep 22, 2.1K upvotes) with no Qwen 4 models, pricing, or docs public as of the Sep 30 cutoff.
Zhipu AI
The "OX Alpha" mystery resolved: the anonymous OpenRouter darling was GLM-5.3-Flash, now public at $0.15/$0.50 per MTok with AA Intelligence Index 57 at $0.045 per task. GLM-5.3's open weights (753B, custom "glm-5.3" license, 1.4M downloads/month) posted the best recorded CyberGym at 84.5%. The Coding Plan runs a 30% promo (Lite $12.60) with a night-unlimited Flash event extended to Oct 7; a FlashX variant serves 200 tok/s at $0.37/$1.25. GLM-5.3 also landed on Mistral's EU-controlled platform on Sep 16. Then the scrutiny: NIST CAISI (Sep 17) called it the most cyber-capable open-weight model to date, and Anthropic (Sep 29) showed safeguards bypassed 64%/92%/100% plus a $20.40 chained Chrome exploit.
Risks: promo volatility (discounts moved 10% to 30% month-over-month, event dates slip), a custom license replacing MIT, and no usage policy for offensive cyber work. mrngd (1,132 points): "Smashes deepseek v4 flash, and even worse it matches v4 pro at a tiny fraction the cost" (49450627). minimaxir on the Anthropic report (251 points): "research conflict of interest with a direct competitor?" (49897239). On Reddit the report backfired louder: "Anthropic just dropped the greatest advertisement for GLM ever" (2.3K upvotes), where segmond notes "it's cheaper to pay for GLM5.3 than Mythos" (comment) and Houston_NeverMind calls 5.3 Flash via opencode "better than DS4.1 flash" (comment).
DeepSeek
V4.1-Flash launched Sep 10: a 552B-backbone MoE with 1M context, 384K max output, and MIT weights. Off-peak pricing fell to $0.15/$0.60 per MTok (from $0.22/$0.66) with $0.003 cache hits. Benchmarks went machine-readable: Terminal-Bench 2.1 90.6, DeepSWE 74.2 (edging GPT-6 Astra's 74.1 at a fraction of the price), CyberGym 88.1, but Terminal-Bench 4.0 only 31.2 versus Opus-5.0's 51.8. The planned Sept 14 force-reroute of V4-Pro to Flash was reversed the same day "in response to user demand," keeping Pro at $0.66/$1.98 with no commitment. DeepSeek entered the harness business with DeepSeek Harness in dev preview and closed the month with a Huawei chip-tools partnership.
Risks: no training opt-out on the official API, V4-Pro's status is indefinite-but-unsigned, and only concurrency limits (2,500/500) are documented. simonw (420 points): "API model providers should lean towards not swapping out models on their paying customers, no matter how much 'better' the new model is meant to be" (49626306). pimeys (177 points): "the cost per task is under a dollar, usually 15-30 cents... with GPT 5.5 a 800 dollar task was not uncommon" (49730346). The distillation dispute also drove r/Anthropic's 2.2K-upvote thread on a DeepSeek engineer's reply to Dario Amodei, where ForwardLoop quipped "I was hoping for Star Trek. Turns out 'Enterprise' was the pricing tier" (comment).
Cerebras (Cerebras Code)
The shared API now serves exactly two models: Qwen 3.8 27B launched Sep 3 at $0.99/$1.49 per MTok and ~1,850 tok/s (multimodal, agentic-coding tuned), while Gemma 4 31B was pulled the same day with no notice beyond a Discord heads-up. The $50/$200 Cerebras Code subscriptions were delisted entirely after ~5 months unavailable, with no closure announcement, and the recurring free tier became a one-time $5 credit expiring in 30 days. Caching is now formally documented as zero-discount: cached tokens bill at the full input rate. The business tilted toward financed deployment: CS-4 ships this quarter, a General Compute neocloud deal lands Q1 2027, and AlphaSense cut p90 TTFT 88% (19.5s to 2.3s).
Risks: zero-day model removals with no deprecation policy, the 150K uncached TPM Developer limit on Qwen 3.8 (one user hit it in 90 seconds), and fully opaque Enterprise pricing. puppymaster (691 points): "No migration notice and all developers are scrambling as we speak" (49560124). eli measured "a 91.4% cache hit rate. They just give zero discount" (49556006).
xAI
Grok 4.7 shipped Sep 21: a larger base with a longer RL run, same $2/$6 as 4.6 (whole-request doubling to $4/$12 at 200K prompt tokens), 500K context, and first-party benchmarks for the first time (CursorBench 4.0 46.3%, DeepSWE 71.0%, Terminal-Bench 4.0 37.6%). Independent scoring puts Grok 4.7 plus Grok Build 4th among native harnesses (Coding Agent Index 56) but flags ~81k output tokens per task, 125% more than Grok 4.6. Enterprise went from absent to documented: OIDC login, requirements.toml pinning, sandbox profiles, team-level ZDR. Grok Build gained persistent memory Sep 16, and a $100 SuperGrok Plus tier appeared.
Risks: the July whole-repo exfiltration incident has no advisory three months on, consumer plans remain pinned to Grok 4.6 with no 4.7 date, usage limits are unquantified, and Batch (20% off) excludes both flagships. attentive (609 points): "$0.50 for cache reads, which is 25% of input. While other models are 10% of input" (49792144). slowin: "Grok will end tasks almost immediately and claim 'Done!'... I can't use Grok for any serious coding task" (49789392).
Google (Gemini Code Assist)
Gemini 3.8 Flash launched Sep 2 as the third Flash in six weeks at an introductory $0.75/$3.75 through Dec 31 (Flex/Batch $0.375/$1.875), joined by the Fairwind-gated 3.8 Flash Cyber and the Fairwind Program (650+ partners) pairing it with the CodeMender harness. The month closed with Gemini 4 Argon (Sep 30): introductory $2/$10 with cache 95% off ($4/$20 after), a 1M-token output limit, DeepSWE v1.1 77.9% claimed SOTA, and AutomationBench 51.3%, rolling out to trusted cyber defenders first with no GA date while Bloomberg reported employee skepticism. Code Assist held at $22.80 Standard / $54 Enterprise, and 3.1 Pro Preview remains the only GA-priced Pro four months into the 3.x Pro gap.
Risks: Flash intro pricing doubles Jan 1, 2027, comparison charts are images, Code Assist limits are undisclosed, and AI Studio data-deletion claims went unaddressed. The Argon thread hit 1,683 points: babelfish, "Gemini not beating the 'can't release a model' allegations" (49913608). deanc: "I pay for AI plus... the most recent model I can use is 3.6-flash-lite" (49913884).
Mistral AI (Mistral Vibe)
Capital and sovereignty, not models: a €3B Series D at more than €21B post-money led by Samsung (Sep 8), Europe's largest tech equity round, and Z.ai GLM 5.3 hosting on Sep 15 at $1.40/$4.40 with $0.14 cached input, the only 1M-context coding model under Mistral's EU regional controls (+10%); GLM 5.2 retires Oct 31. Security carried the month: five Vibe CLI shell-permission CVEs enabling arbitrary code execution from hostile repos were fixed in 2.25.4 on Sep 12, with hardening through 2.25.8. Cloudera adds fully air-gapped deployment. Plans now bundle API credits (Free $10/mo, Pro $14.99 with $30/mo).
Risks: no first-party coding model shipped (Medium 3.5 is five months old, Codestral 14), plan limits are multipliers without baselines, and the pricing page still says Vibe is "powered by Devstral" after Devstral 2 retired. nik736 (850 points): "Mistral Medium 3.5 with reasoning is worse than Gemma 4 31B and Glimmer 30B... Their API pricing is just insane for what you get" (49606808). rldjbpin: "if the core model could be any open-weights solution out there, the moat dissolves really quickly" (49625447).
Meta
Muse Spark 1.3 launched Sep 2 at $1.25/$4.25 per MTok (1M context, text+image+video) with a contributor tier at $0.10/$0.20 that lets Meta train on traffic, plus a same-day OpenRouter listing. Muse Code pricing became machine-readable: $5/$15/$50 per month (10-50 prompts per 5 hours at entry), the cheapest paid coding-agent entry tracked. The open-weight Glimmer 30B (Apache 2.0, SWE-Bench Pro 51.2, 233 tok/s on an RTX 5090) anchors the local story. Independent checks cut both ways: AA scores Spark 1.3 at Intelligence Index 48 (#23 of 224, after an early #3 report) with a 52.46-second time-to-first-token and 2.1x verbosity. Spark 1.2's promised open weights still have not shipped. Meta hired CJ Desai to lead enterprise AI Sep 29 while consumer Muse privacy incidents (163 points) piled up.
Risks: weights closed, parameter counts undisclosed, no SSO/audit/SLA/indemnity, and subscription units lack token denominators. The launch thread (691 points) focused on price: wxw, "contributor pricing at $0.10/$0.20 is crazy cheap if it's measuring up to Sol" (49541501). jmward01: "the first quantifiable number I have seen out there from a model provider" (49543189).
Meituan (LongCat)
LongCat broke a two-month silence: LongCat-2.5-Preview landed Sep 25 at the same limited-time $0.30/$1.20 per MTok as 2.0 (1M context, image understanding, $0.006 cached input), but with no benchmarks, no model card, and no weights (Hugging Face still tops out at 2.0 variants from July). The platform matured commercially: Enterprise Verification with tiered discounts (10% at $75/mo up to 40% at $6,000/mo), self-service invoicing, and international USD billing. LongCat-2.0 was made free in Cline Sep 1-2, and the harness docs now cover 13 tools including OpenCode and Tencent's CodeBuddy. The Sep 30 LongCat-DeepResearch release (MIT harness) scored 55.25 on DeepResearchBench above ChatGPT's 54.95, with gains slated for the next general model.
Risks: every headline price is "limited-time" with no list-price anchor, 2.5-Preview claims are unverifiable, rate limits are unpublished (429s with retry_after 60 only), and there is no SSO, audit, or SLA surface. September produced zero relevant HN engagement (the Cline promo drew 1 point); the last substantive thread remains the June launch (281 points), so no in-window quotes exist.
MiniMax
September converted MiniMax from a models supplier into a subscription-plus-agent supplier. M3.1-Flash-Preview debuted Sep 28 (1M context, tunable thinking depth) only inside M Plan and the reimagined MiniMax Code v3.1.0, with no API pricing or benchmarks and unlimited use Oct 1-7. The M Plan (Sep 29) runs Go/Explore/Build at $22/$55/$132 (annual = pay 10 get 2 free, 50% off the first month through Oct 14) and replaces Token Plan for new buyers; legacy perks are forfeited on upgrade. M3's effective $0.30/$1.20 per MTok with $0.06 cache reads is exactly double DeepSeek's off-peak Flash. H1 2026 brought unusual transparency: revenue $116.6M (+283.1%), Open Platform +703.1%, adjusted net loss $293.0M. M3 posts BrowseComp 83.5, above Opus 4.7's 79.3.
Risks: no tier publishes absolute quotas (Explore "3x," Build "7.5x" of an unpublished baseline), M3.1-Flash-Preview is fully opaque, and SSO/SCIM/audit/SLA are absent. September HN engagement was near zero: the launch submission drew 1 point, and the last high-engagement thread remains M2.7 open-sourcing at 84 points in April; no quotable permalinks exist for this window.
JetBrains (Junie)
First month tracked; added because Junie pairs the tracker's cheapest credible paid entry (AI Pro $10/mo with 10 AI Credits, Ultimate $30 with 35, BYOK at zero markup) with the top agent slot on independent ranking: SWE-Rebench puts Junie #1 among agents at 61.8% resolved and $0.81 per problem versus Claude Code's 60.4% and $3.39, with 85.9% of its 1.68M tokens per problem cached. Junie Local gained a Qwen3.8-3.6-27B-blend on Sep 18: 37/100 internal tasks versus 34 for Qwen3.6, with 71% fewer output tokens than Qwen3.8 and 85.47% on LiveCodeBench. Gemini 3.7 Flash became default at 40% off, 3.8 Flash arrived at 75% off, and the CLI added Grok 4.7, Opus 5.5, Sonnet 5.5, and GPT-6.1 Sol within days of launch. A "Junie Lite" free layer followed Oct 1, post-cutoff.
Risks: no per-model credit-consumption table exists (quota is "calculated dynamically"), promos lack base rates and end dates, helper models bill even under BYOK, and Local needs an M5 Mac with 64GB RAM. palata (5 points): "Could companies stop training people to run random scripts from the internet directly in their terminal?" Syntaf (278 points) cited JetBrains's rtk finding that agents "perform *more* turns and use *more* tokens" (49592165).
ByteDance (TRAE)
First month tracked; added because TRAE is the cheapest way to rent the September frontier (19 built-in models spanning OpenAI, Google, DeepSeek, Kimi, GLM, MiniMax, and Seed) in one IDE, with an unusually transparent per-model rate card ($0.10 GPT-6-Luna to $10 GPT-6-Astra input). The Sep 17 restructuring is the defining event: legacy Pro+ at $30/mo with $90 of usage became $60 with $60, and legacy Ultra at $100 with $400 became $200 with $200; price-protected subscribers keep old prices but drop to the new allowances. Plans run Free ($1 usage), Pro $20 (600 fast-queue requests), Pro+ $60, Ultra $200, plus an $8 Lite tier in 12 countries only. The GPT-6 family, GLM-5.2, DeepSeek-V4-Flash, and Kimi-K2.7-Code arrived; Claude and Qwen are absent (Claude BYOK-only), and Seed/MiniMax/GLM are blocked for US users. Enterprise is GA with SOC 2 Type 2 and spend caps, and first-party Volcengine Ark pricing (recovered Oct 3) lists doubao-seed-2.0-code at ¥3.2/¥16.0 to ¥9.6/¥48.0 per MTok tiered by context, seed-2.1-pro at ¥6/¥30, plus purchasable Ark Coding Plan products.
Risks: the restructuring lives only in billing docs (blog silent since Jul 2, changelog since Aug 19), the last coding benchmark is a June 2025 ensemble claim of 75.2% SWE-bench Verified, and SSO/SCIM/audit/SLA are undocumented. September HN engagement was zero; the standing narrative remains segfault22's 954-point finding that "The telemetry 'off' switch appears to be purely cosmetic."
Tencent (CodeBuddy)
First month tracked; added because CodeBuddy holds the tracker's bottom price band with WeChat-scale distribution and a 770B open-weight release. Hunyuan Hy4 preview (770B total / 49B active MoE, 1M context, Apache 2.0) was open-sourced Aug 28 and ran free inside CodeBuddy/WorkBuddy only through Sep 10; post-trial availability and pricing are undisclosed. Its blind internal eval scored 2.99 versus GLM 5.3's 2.92 and Kimi K3's 2.94, with the README admitting over-reasoning. Plans run Trial ¥0 (500 credits), Standard ¥99 (~$14) with 4,000 credits, up to Flagship ¥999, with auto-renew promos at ¥70/¥140/¥700 and annual at 44% off; enterprise seats are ¥198 (with the Tencent Docs/Drive bundle) or ¥316 single-tenant, plus on-premises. The Hunyuan API is migrating to TokenHub, leaving flagship per-token prices behind a login-gated console.
Risks: no per-model credit costs (burn rate cannot be forecast), no promo end dates, benchmark tables exist only as images, and there is no SSO, SLA, or English pricing surface. Western footprint is effectively zero: the Hy4 release drew 2 points on HN with 0 comments, so no in-window quotes exist; DeepSeek separately named CodeBuddy a harness it trained against.