GPT-5.1-Codex-Max
LLM
by openai ·
openai-gpt-51-codex-max-20251204
Context window
400K
Max output
128K
Providers
2
Best input
$1.25
About this model
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...
Providers & prices
| Provider | Input $/MTok | Output $/MTok | Context | Upstream ID |
|---|---|---|---|---|
| O OpenAI | $1.25 | $10.00 | 400K | openai/gpt-5.1-codex-max |
| MA Microsoft Azure | $1.25 | $10.00 | 400K | openai/gpt-5.1-codex-max |