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...
Specification
- Model ID
- openai/gpt-5.1-codex-max
- Weight license
- Not verified; consult the exact publisher model card
- Modality
- Text+image >text
- Context
- 400K tokens
- Input
- $1.25/1M
- Output
- $10.00/1M
- Web search
- $10000.00/1M
- Updated
- Nov 14, 2026
Scores
Capabilities
- Supports tool calling
- Supports vision inputs
- Supports long-context workflows
- Supports deeper reasoning tasks
Input and output
Accepts Text, Image inputs. Returns Text outputs.
Supported parameters
include_reasoningmax_completion_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity
Related models
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