All Models
GPT-5.1 Codex Max
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows spanning software engineering, mathematics, and research. GPT-5.1-Codex-Max delivers faster performance, improved reasoning, and higher token efficiency across the development lifecycle.
Available Providers (13)
| Provider | Model ID | Input Cost | Output Cost | Context | Max Output | Docs |
|---|---|---|---|---|---|---|
 GitHub Copilot | gpt-5.1-codex-max | $0.00/MTok | $0.00/MTok | 400K | 128K | |
 Poe | openai/gpt-5.1-codex-max | $1.10/MTok | $9.00/MTok | 400K | 128K | |
 OpenRouter | openai/gpt-5.1-codex-max | $1.10/MTok | $9.00/MTok | 400K | 128K | |
 Requesty | openai/gpt-5.1-codex-max | $1.10/MTok | $9.00/MTok | 400K | 128K | |
 Jiekou.AI | gpt-5.1-codex-max | $1.13/MTok | $9.00/MTok | 400K | 128K | |
 OpenCode Zen | gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 AIHubMix | gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 Abacus | gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 Vivgrid | gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 Vercel AI Gateway | openai/gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 OpenAI | gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 Azure | gpt-5.1-codex-max | $1.25/MTok | $10.00/MTok | 400K | 128K | |
 NanoGPT | openai/gpt-5.1-codex-max | $2.50/MTok | $20.00/MTok | 400K | 128K |
Capabilities
Reasoning
Tool Calling
Attachments
Open Weights
Structured Output