Key Terms
- Token-based billing - charges based on the number of input and output tokens processed. One token is roughly 4 characters or 0.75 words. Codex credits are consumed based on token rates for Business and new Enterprise customers. Source: Openai – Pricing
- Prompt caching - stores frequently used prompts on OpenAI's servers to reduce latency and cost. Cached input tokens cost 90% less than regular input tokens (e.g., $0.50/MTok cached vs $5.00/MTok standard for GPT-5.5). Source: OpenAI – Pricing
- Batch API - asynchronous processing at 50% of standard rates, with results available within 24 hours. GPT-5.5 Batch: $2.50/$15.00 per MTok. Source: OpenAI – Pricing
- Flex processing - best-effort processing at 50% of standard API rates. May have higher latency and lower availability. Source: OpenAI – Flex Processing
- Priority processing - guaranteed faster processing at 2.5x standard API rates. GPT-5.5 Priority: $12.50/$75.00 per MTok. Source: OpenAI – Pricing
- Context window - the maximum number of tokens a model can process in a single conversation. GPT-5.5 supports 1M tokens via API, 400K in Codex for Pro/Enterprise users, and 256K for Plus/Business. Source: OpenAI – Introducing Gpt 5 5
- Fast mode - generates tokens 1.5x faster for 2.5x the credit cost in Codex. Available for supported models. Source: Openai – Pricing
- Credits - the core billing unit for Codex usage beyond included limits. As of April 2, 2026, Business and new Enterprise customers are billed based on API token rates mapped to credits. Source: Openai – Pricing
- GPT-5.3-Codex - a specialized model optimized for coding tasks within Codex. Priced at $1.75/$14.00 per MTok via API. Used for cloud tasks and code review. Source: OpenAI – Pricing
- GPT-5.3-Codex-Spark - a fast Codex model in research preview for ChatGPT Pro users only. Not available via API. Separate usage limit that may adjust based on demand. Source: Openai – Pricing
- Trusted Access for Cyber - a pilot program giving verified defenders expanded access to cyber-permissive models like GPT-5.4-Cyber with fewer restrictions. Source: OpenAI – Scaling Trusted Access For Cyber Defense
- Data residency - support for processing data in specific geographic regions (US, EU, UK, JP, CA, KR, SG, IN, AU, UAE) with a 10% price uplift for eligible models. Enterprise only. Source: OpenAI – Pricing
Latest Changes
Changes since the 2026-04 report.
- Promo expiry: Pro plan promotional multipliers expire May 31, 2026. Pro $100/mo reverts from 10x to 5x Plus usage. Pro $200/mo reverts from 25x to 20x Plus usage on 5h limits. This is a significant capacity reduction for existing Pro users. Source: Openai – Pricing
- Feature added: Codex now available in the ChatGPT mobile app (iOS and Android), announced May 14. Users can manage coding tasks from mobile with full context sync across devices. Source: OpenAI – Work With Codex From Anywhere
- Feature added: Remote SSH support for managed development environments in Codex (May 14). Source: OpenAI – Work With Codex From Anywhere
- Feature added: Scoped programmatic access tokens and hooks for Codex enterprise deployments (May 14). Source: OpenAI – Work With Codex From Anywhere
- Feature added: HIPAA-compliant use support for Codex (May 14). Source: OpenAI – Work With Codex From Anywhere
- Partnership: OpenAI and Dell Technologies partner to bring Codex to hybrid and on-premises enterprise environments via Dell AI Data Platform and Dell AI Factory, announced May 18. Source: OpenAI – Dell Codex Enterprise Partnership
- Recognition: OpenAI named a Leader in the Gartner Magic Quadrant for Enterprise AI Coding Agents (May 22). Gartner highlighted Codex's agentic software development, enterprise governance, sandboxing, and flexible deployment. Source: OpenAI – Gartner 2026 Agentic Coding Leader
- Security incident: OpenAI responded to the TanStack npm supply chain attack (May 13). Codex's sandboxing prevented the compromised package from affecting users. Source: OpenAI – Our Response To The Tanstack Npm Supply Chain Attack
- Feature added: Open-source Windows sandbox for Codex (May 13). Source: OpenAI – Building Codex Windows Sandbox
- Deprecation: OpenAI is winding down the fine-tuning platform. No longer accessible to new users. Existing users can create training jobs for the coming months. Fine-tuned models remain available for inference until base models are deprecated. Source: OpenAI – Pricing
- Company: OpenAI launched the OpenAI Deployment Company to help businesses build around AI (May 11). Source: OpenAI – Openai Launches The Deployment Company
- Research: An OpenAI model disproved a central conjecture in discrete geometry (May 20). 1,429 points on Hacker News with 1,054 comments. Source: OpenAI – Model Disproves Discrete Geometry Conjecture
- Community signal: GPT-5.6 spotted in Codex UI by Reddit users (late May), 472 upvotes. Not officially confirmed. Source: Reddit – Gpt56 Spotted In Codex
- No pricing changes: All API and plan prices remain unchanged since April 2026.
Plans
| Plan | Price | Usage Model | Key Inclusions |
|---|---|---|---|
| Free | $0/mo | Limited (10 GPT-5.5 messages/5h) | Limited GPT-5.5 Instant, limited Codex, limited messages/uploads, 27K instant context window |
| Go | $8/mo | Expanded (160 GPT-5.5 messages/3h) | More GPT-5.5 Instant, 54K instant context, more messages/uploads, may include ads |
| Plus | $20/mo | Shared 5h window (15-80 GPT-5.5 local messages) | GPT-5.5 Thinking (3,000/week), 256K reasoning context, expanded Codex, deep research, agent mode, projects, tasks, custom GPTs. 2x Codex usage promo expired May 31, 2026 |
| Pro 5x | $100/mo | 5x Plus usage (reverting from 10x promo) | GPT-5.5 Pro, 400K context, unlimited GPT-5.3, GPT-5.3-Codex-Spark (research preview), ChatGPT Pulse, max deep research/agent mode |
| Pro 20x | $200/mo | 20x Plus usage (reverting from 25x promo) | Everything in Pro 5x at maximum limits |
| Business Codex | Pay-as-you-go | Per-token billing, no seat fee | AI software engineering, automated code/security reviews, cloud environments, worktrees, SAML SSO, MFA, no training on data, SOC 2 Type 2 |
| Business ChatGPT & Codex | $25/user/mo (annual) | Per-seat + usage | Everything in Plus and Business Codex, 60+ app integrations (Slack, Google Drive, SharePoint, GitHub), shared projects, custom workspace GPTs |
| Enterprise | Custom pricing | Scales with credits | SCIM, EKM, audit logs, data residency (10 regions), 128K instant context, 400K reasoning context, 24/7 priority support, SLAs, RBAC, compliance API, IP allowlisting, HIPAA support, branded workspace |
Codex usage limits per 5h window (after promo expiry):
| Model | Plus (local) | Pro 5x (local) | Pro 20x (local) | Plus (cloud) | Pro 5x (cloud) | Pro 20x (cloud) |
|---|---|---|---|---|---|---|
| GPT-5.5 | 15-80 | 80-400 | 300-1,600 | Not available | Not available | Not available |
| GPT-5.4 | 20-100 | 100-500 | 400-2,000 | Not available | Not available | Not available |
| GPT-5.4-mini | 60-350 | 300-1,750 | 1,200-7,000 | Not available | Not available | Not available |
| GPT-5.3-Codex | 30-150 | 150-750 | 600-3,000 | 10-60 | 50-300 | 200-1,200 |
Note: Local messages and cloud tasks share a 5h window. Additional weekly limits may apply. Enterprise/Edu users on flexible pricing have no fixed rate limits; usage scales with credits.
Source: Openai – Pricing
API Pricing
Standard pricing (per 1M tokens):
| Model | Input | Cached Input | Output | Long Context Input | Long Context Cached | Long Context Output |
|---|---|---|---|---|---|---|
| GPT-5.5 | $5.00 | $0.50 | $30.00 | $10.00 | $1.00 | $45.00 |
| GPT-5.5 Pro | $30.00 | - | $180.00 | $60.00 | - | $270.00 |
| GPT-5.4 | $2.50 | $0.25 | $15.00 | $5.00 | $0.50 | $22.50 |
| GPT-5.4 Pro | $30.00 | - | $180.00 | $60.00 | - | $270.00 |
| GPT-5.4 Mini | $0.75 | $0.075 | $4.50 | - | - | - |
| GPT-5.4 Nano | $0.20 | $0.02 | $1.25 | - | - | - |
Specialized models (per 1M tokens):
| Category | Model | Input | Cached Input | Output |
|---|---|---|---|---|
| ChatGPT | chat-latest | $5.00 | $0.50 | $30.00 |
| Codex | GPT-5.3-Codex | $1.75 | $0.175 | $14.00 |
| Cyber | GPT-5.4-Cyber | Undisclosed | Undisclosed | Undisclosed |
Batch pricing (50% discount, per 1M tokens):
| Model | Input | Cached Input | Output |
|---|---|---|---|
| GPT-5.5 | $2.50 | $0.25 | $15.00 |
| GPT-5.5 Pro | $15.00 | - | $90.00 |
| GPT-5.4 | $1.25 | $0.13 | $7.50 |
| GPT-5.4 Mini | $0.375 | $0.0375 | $2.25 |
| GPT-5.4 Nano | $0.10 | $0.01 | $0.625 |
| GPT-5.4 Pro | $15.00 | - | $90.00 |
| o3 Deep Research | $5.00 | - | $20.00 |
| o4-mini Deep Research | $1.00 | - | $4.00 |
| Computer Use | $1.50 | - | $6.00 |
Flex pricing (50% discount, same as Batch): Available for all flagship models at the same rates as Batch.
Priority pricing (2.5x standard, per 1M tokens):
| Model | Input | Cached Input | Output |
|---|---|---|---|
| GPT-5.5 | $12.50 | $1.25 | $75.00 |
| GPT-5.4 | $5.00 | $0.50 | $30.00 |
| GPT-5.4 Mini | $1.50 | $0.15 | $9.00 |
| GPT-5.3-Codex | $3.50 | $0.35 | $28.00 |
Other pricing:
- Web search: $10.00 per 1,000 calls + search content tokens billed at model rates
- Containers (Hosted Shell / Code Interpreter): $0.03 (1GB) to $1.92 (64GB) per 20-minute session
- File search storage: $0.10/GB per day (1GB free)
- File search tool call: $2.50 per 1,000 calls
- Data residency: 10% uplift for models released on or after March 5, 2026
- Fine-tuning (o4-mini only): $100/hour training, $4/$16 per MTok inference ($2/$8 with data sharing)
Codex credit rates (Business & new Enterprise, credits per 1M tokens):
| Model | Input Tokens | Cached Input | Output Tokens |
|---|---|---|---|
| GPT-5.5 | 125 | 12.50 | 750 |
| GPT-5.4 | 62.50 | 6.250 | 375 |
| GPT-5.4-mini | 18.75 | 1.875 | 113 |
| GPT-5.3-Codex | 43.75 | 4.375 | 350 |
| GPT-Image-2 (image) | 200 | 50 | 750 |
Source: OpenAI – Pricing, Openai – Pricing
Model Performance / Benchmarks
GPT-5.5 benchmarks (from launch announcement, April 23, 2026):
| Benchmark | GPT-5.5 | GPT-5.4 | GPT-5.5 Pro | Claude Opus 4.7 | Gemini 3.1 Pro |
|---|---|---|---|---|---|
| SWE-Bench Pro (Public) | 58.6% | 57.7% | - | 64.3% | 54.2% |
| Terminal-Bench 2.0 | 82.7% | 75.1% | - | 69.4% | 68.5% |
| Expert-SWE (Internal) | 73.1% | 68.5% | - | - | - |
| GDPval (wins/ties) | 84.9% | 83.0% | 82.3% | 80.3% | 67.3% |
| OSWorld-Verified | 78.7% | 75.0% | - | 78.0% | - |
| ARC-AGI-1 (Verified) | 95.0% | 93.7% | - | 93.5% | 98.0% |
| ARC-AGI-2 (Verified) | 85.0% | 73.3% | - | 75.8% | 77.1% |
| CyberGym | 81.8% | 79.0% | - | 73.1% | - |
GPT-5.3-Codex benchmarks (from launch announcement, February 5, 2026):
| Benchmark | GPT-5.3-Codex | GPT-5.2-Codex | GPT-5.2 |
|---|---|---|---|
| SWE-Bench Pro | 56.8% | 56.4% | 55.6% |
| Terminal-Bench 2.0 | 77.3% | 64.0% | 62.2% |
| OSWorld-Verified | 64.7% | 38.2% | 37.9% |
| GDPval (wins/ties) | 70.9% | - | 70.9% |
Note: OpenAI notes evidence of memorization on SWE-Bench Pro by other labs. OpenAI has deprecated SWE-bench Verified in favor of SWE-Bench Pro, arguing the former is saturated and Python-only.
Source: OpenAI – Introducing Gpt 5 5 OpenAI – Introducing Gpt 5 3 Codex
Latest News
May 2026 announcements (chronological):
- May 11: OpenAI Deployment Company launched. A new entity to help businesses build around AI intelligence, offering implementation services alongside OpenAI's products. Source: OpenAI – Openai Launches The Deployment Company
- May 13: TanStack npm supply chain attack response. OpenAI disclosed that a compromised TanStack npm package was used in a credential theft attack. Codex's sandboxing prevented the compromised package from affecting users. OpenAI open-sourced its Windows sandbox in the same timeframe. Source: OpenAI – Our Response To The Tanstack Npm Supply Chain Attack OpenAI – Building Codex Windows Sandbox
- May 14: Codex available on mobile. Codex is now in the ChatGPT iOS and Android apps. Also announced: Remote SSH support for managed development environments, scoped programmatic access tokens, hooks for enterprise deployments, and HIPAA-compliant use support. Source: OpenAI – Work With Codex From Anywhere
- May 18: Dell Technologies partnership. Codex will connect with the Dell AI Data Platform and Dell AI Factory, enabling hybrid and on-premises enterprise deployments. This addresses enterprises that need Codex closer to their internal data and systems. Source: OpenAI – Dell Codex Enterprise Partnership
- May 20: AI model disproves discrete geometry conjecture. An internal version of GPT-5.5 discovered a new proof about Ramsey numbers in combinatorics, later verified in Lean. This demonstrates GPT-5.5's capability beyond coding into mathematical research. Source: OpenAI – Model Disproves Discrete Geometry Conjecture
- May 22: Gartner Magic Quadrant Leader. OpenAI named a Leader in the inaugural Gartner Magic Quadrant for Enterprise AI Coding Agents. Gartner highlighted agentic software development, enterprise governance, sandboxing, and flexible deployment. Cisco cited as a case study: used Codex to develop the majority of its AI Defense platform, shortening delivery from several quarters to weeks. Until June 12, eligible enterprises can get two months of free Codex usage. Source: OpenAI – Gartner 2026 Agentic Coding Leader
- May 27: Self-improving tax agents with Codex. Engineering blog post detailing how OpenAI and Thrive Holdings built Tax AI for Crete accountants. The system processed 7,000 tax returns, achieving 97% accuracy on draft returns. Demonstrates Codex's application beyond software engineering into domain-specific professional workflows. Source: OpenAI – Building Self Improving Tax Agents With Codex
- May 28: OpenAI Frontier Governance Framework. Published the company's framework for governing frontier AI models, including preparedness evaluations and safety processes. Source: OpenAI – Openai Frontier Governance Framework
- Ongoing: Fine-tuning platform wind-down. OpenAI is winding down the self-serve fine-tuning platform. Only o4-mini remains available for fine-tuning ($100/hour training). All fine-tuned models remain available for inference until base model deprecation. Source: OpenAI – Pricing
Community Signals
Hacker News:
The biggest OpenAI story on Hacker News in May was the discrete geometry result: "An OpenAI model has disproved a central conjecture in discrete geometry" received 1,429 points and 1,054 comments, making it one of the most-discussed AI stories of the month. Source: News – Item
"Codex is now in the ChatGPT mobile app" received 486 points and 247 comments on May 15, with discussion focused on the implications of mobile-first agentic coding. Source: News – Item
The "OpenAI Deployment Company" announcement (May 11) generated 42 points and 33 comments, with skepticism about OpenAI becoming a consulting organization. Source: News – Item
Reddit (r/OpenAI):
"GPT-5.6 spotted in Codex" (late May) received 472 upvotes and 93 comments. Users reported seeing GPT-5.6 as an option in the Codex model picker before it was removed. OpenAI has not confirmed GPT-5.6. Source: Reddit – Gpt56 Spotted In Codex
"First thing you see when Googling 'OpenAI Codex app' is a fake malware website" received 736 upvotes and 79 comments. This highlights a growing brand safety problem as Codex's popularity attracts phishing attempts. Source: Reddit – First Thing You See When Googling Openai Codex
"OpenAI codex tool compromised in credential theft supply chain attack" was also discussed, though the post received only 6 comments, suggesting the community recognized that Codex's sandboxing prevented actual impact. Source: Reddit – Openai Codex Tool Compromised In Credential Theft
A "macOS Menubar app to monitor token availability in Codex, Claude and Gemini" was shared, indicating that users across platforms are actively tracking usage limits, a signal that limits are a pain point. Source: Reddit – Macos Menubar App To Monitor Token Availability
General signals:
The GPT-5.5 launch blog quotes multiple partner CEOs (Cursor's Michael Truell, NVIDIA's Justin Boitano, Every's Dan Shipper) praising the model's "conceptual clarity" and sustained performance. These are curated testimonials, but the breadth of partner endorsements (Cursor, Lovable, Cognition, Windsurf, GitHub, JetBrains, Sonar) suggests strong adoption across the coding agent ecosystem. Source: OpenAI – Introducing Gpt 5 5
OpenAI's internal usage statistic is notable: "more than 85% of the company uses Codex every week across functions including software engineering, finance, communications, marketing, data science, and product management." Source: OpenAI – Introducing Gpt 5 5
Enterprise Readiness
| Feature | Available? | Details |
|---|---|---|
| SSO (SAML) | Yes | Business and Enterprise plans |
| SCIM | Yes | Enterprise only. Automated user provisioning/deprovisioning |
| Audit logs | Yes | Enterprise only. Compliance API Logs Platform for Codex tasks |
| IP indemnity | Undisclosed | Not mentioned in plan comparison or enterprise features |
| Data residency | Yes | Enterprise only. 10 regions (US, EU, UK, JP, CA, KR, SG, IN, AU, UAE). 10% price uplift for eligible models |
| HIPAA | Yes | Codex supports HIPAA-compliant use (announced May 14) |
| Air-gapped / on-prem | Partial | Dell partnership announced May 18 for hybrid/on-prem via Dell AI Data Platform and Dell AI Factory. Not yet available for general deployment |
| SLA | Yes | Enterprise only. 24/7 priority support, SLAs, custom legal terms |
| Admin controls (RBAC) | Yes | Enterprise only. Role-based access controls, domain verification, IP allowlisting, EKM, connector registry |
| EKM (Encryption Key Management) | Yes | Enterprise only |
| ISO certifications | Yes | Enterprise only: ISO 27001, 27017, 27018, 27701 |
| SOC 2 Type 2 | Yes | Business and Enterprise |
| Intune MDM | Yes | Enterprise only. Intune for iOS |
| No training on data | Yes | Business and Enterprise by default |
| Custom data retention | Yes | Enterprise only |
| Branded workspace | Yes | Enterprise only |
Source: Chatgpt – Pricing Openai – Pricing
Terms explained:
- SCIM - System for Cross-domain Identity Management. Allows automatic syncing of user accounts between your identity provider (Okta, Azure AD) and ChatGPT Enterprise. Source: Chatgpt – Pricing
- EKM - Enterprise Key Management. Customer-managed encryption keys so OpenAI cannot decrypt your data without your key. Source: Chatgpt – Pricing
- IP indemnity - the provider covers your legal costs if their AI output infringes a third party's copyright. OpenAI's IP indemnity posture is not prominently documented on the pricing or enterprise pages.
Transparency Gaps
- Usage limit ranges are opaque. Codex usage limits are expressed as wide ranges (e.g., "15-80" GPT-5.5 messages per 5h for Plus, "80-400" for Pro 5x). The actual number depends on "size and complexity of your coding tasks," which cannot be predicted before use. Users cannot budget accurately. Source: Openai – Pricing
- Promotional pricing expiry. The Pro plan promotional multipliers (10x for $100, 25x for $200) expire May 31, 2026. Users who signed up during the promo period will see an immediate 40-50% reduction in effective capacity. The permanent pricing (5x and 20x) was always stated but the promo duration was short (approximately one month). Source: Openai – Pricing
- GPT-5.4-Cyber pricing undisclosed. The specialized cybersecurity model's pricing is listed as "undisclosed" on the public pricing page. Organizations must apply through the Trusted Access for Cyber program. Source: OpenAI – Pricing
- Business ChatGPT & Codex pricing rendered dynamically. The per-user/month price on the ChatGPT pricing page is dynamically rendered and stripped from text/html fetches. The price is $25/user/mo annual or $30/user/mo monthly based on the plan footnote, but this is not visible in static renders. Source: Chatgpt – Pricing
- Fine-tuning wind-down timeline. OpenAI says the fine-tuning platform will be available "for the coming months" but has not specified an end date. Only o4-mini remains fine-tunable. Source: OpenAI – Pricing
- GPT-5.6 not confirmed. Multiple Reddit users spotted "GPT-5.6" in the Codex model picker in late May, but OpenAI has not acknowledged or confirmed this model. Source: Reddit – Gpt56 Spotted In Codex
- Enterprise pricing undisclosed. Enterprise plan pricing is "custom" and requires a sales conversation. No published starting price or per-seat range.
- Weekly limits mentioned but not quantified. The Codex pricing FAQ mentions "additional weekly limits may apply" on top of the 5h window, but does not specify what those limits are.
- chat-latest model behavior. The API offers a "chat-latest" model at the same pricing as GPT-5.5, but it is not documented which model it resolves to or when it switches between models.