OpenAI: GPT-5.1
openai/gpt-5.1-2025-11-13Created N/A|400K context context|Starting at $1.25/M input tokens|Starting at $10/M output tokens
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.
Providers for GPT-5.1
Routes requests to the best providers that are able to handle your prompt size and parameters.
| Provider | Context Window | Max Output | Input Price | Output Price | Cache Read | Cache Write |
|---|---|---|---|---|---|---|
OpenAI | 400K | 128K | $1.25 | $10 | $0.125 | — |