GPT-5.1 Codex Max
by OpenAIChatdeprecated 2026-07-23
Coding-optimized GPT model for repository edits, reviews, and agentic software work
- Context
- 400K tokens
- Max output
- 128,000 tokens
- Released
- 2025-11-13
- Weights
- Closed
openai/gpt-5-1-codex-max · also seen as azure/gpt-5.1-codex-max, eu/gpt-5.1-codex-max, us/gpt-5.1-codex-max, openai/gpt-5.1-codex-max-20251204
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2025-11-13
- Weights
- Closed
- Input
- Text, Image
- Output
- Text
- Context window
- 400,000 max across endpoints
- Max output
- 128,000
- Providers
- 6 + 11 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $1.25–$3.44 in · $10.00–$27.51 out per 1M tokens · 4 of 6 providers have a comparable price
More details
- Last updated
- 2026-01
- Knowledge cutoff
- 2024-09-30
- Developer country
- United States of America
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel tools
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web search
- Computer useunknown
- System messages
- Assistant prefillunknown
- Temperature
- Streaming
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $1.25 in / $10 out per 1M tokens at Azure on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs GPT-5.1 Codex Max |
|---|---|---|---|---|---|
| Gemini 2.5 ProGoogle | $2.44 | $1.13 | $9.00 | 1.05M | +0% |
| GPT-5-ChatOpenAI | $2.44 | $1.13 | $9.00 | 128K | +0% |
| GPT-5 Image MiniOpenAI | $2.42 | $2.50 | $2.00 | 400K | −1% cheaper |
| Claude Sonnet 5Anthropic | $2.40 | $1.44 | $7.20 | 1M | −2% cheaper |
| Gemini Nano Banana 2.1Google | $2.50 | $1.50 | $7.50 | 131K | +3% |
| Magistral MediumMistral AI | $2.50 | $1.50 | $7.50 | 128K | +3% |
| Mistral Medium 3.5Mistral AI | $2.50 | $1.50 | $7.50 | 262K | +3% |
| Mistral Medium 3.5Mistral AI | $2.50 | $1.50 | $7.50 | 262K | +3% |
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