OpenAI: GPT-5.1-Codex-Max
Released Dec 4, 2025Try it on:
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...
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Pricing
Per token
- Input (per 1M)
- $1.25
- Output (per 1M)
- $10.00
- Cache Read (per 1M)
- $0.125
Per unit
- Web search
- $0.010/call
Capabilities
Modality
text+image->textContext
400K tokens
Tokenizer
GPT
Max output
128K tokens
Moderation
Moderated
Supported parameters
include_reasoning
max_completion_tokens
max_tokens
reasoning
response_format
seed
structured_outputs
tool_choice
tools
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