openai
OpenAI: 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...
Quality Score
99/100
composite of price, context, capability
Input Price
$1.25
per 1M tokens
Output Price
$10.00
per 1M tokens
Context Window
400,000
tokens
- Model ID
- openai/gpt-5.1-codex-max
- Vendor
- openai
- Tokenizer
- GPT
- Input Modalities
- text, image
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
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