GPT-5.1 Codex Max
unknownOpenAI · gpt-codex family
Coding-optimized GPT model for repository edits, reviews, and agentic software work
Limits
Context400,000
Input272,000
Output128,000
Modalities
Inputtext, image
Outputtext
Release info
Release2025-11-13
Last update2025-11-13
Knowledge cutoff2024-09-30
Provider offerings
Provider-specific prices and limits stay separate from canonical model facts.
| Provider | Provider model ID | Input | Output | Context | Output limit |
|---|---|---|---|---|---|
| Neon | gpt-5-1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| Azure | gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| OpenCode Zen | gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| Vivgrid | gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| Jiekou.AI | gpt-5.1-codex-max | $1.125 / 1M | $9 / 1M | 400,000 | 128,000 |
| Abacus | gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| OpenAI | gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| Poe | openai/gpt-5.1-codex-max | $1.1 / 1M | $9 / 1M | 400,000 | 128,000 |
| Vercel AI Gateway | openai/gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| OrcaRouter | openai/gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| Kilo Gateway | openai/gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
| Requesty | openai/gpt-5.1-codex-max | $1.1 / 1M | $9 / 1M | 400,000 | 128,000 |
| NanoGPT | openai/gpt-5.1-codex-max | $2.5 / 1M | $20 / 1M | 400,000 | 128,000 |
| OpenRouter | openai/gpt-5.1-codex-max | $1.25 / 1M | $10 / 1M | 400,000 | 128,000 |
Capabilities
Attachments
Yes
Reasoning
Yes
Tool calling
Yes
Structured output
Yes
Temperature
No