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openai/gpt-5-1-codex-mini
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GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
11/13/2025
400,000 tokens
Specifications
Modalities
Input
image
text
Output
text
Supported Parameters
include_reasoning
max_tokens
reasoning
response_format
seed
structured_outputs
tool_choice
tools
Max Output Tokens
100,000Reasoning Configuration
- Default
- Thinking on (effort: medium)
- Selectable effort levels
- highmediumlow
- Turning thinking off
- Possible (reasoning.enabled: false)
Frequently asked questions
- Is GPT-5.1-Codex-Mini available on FastMetal?
- Not at the moment. GPT-5.6 Sol, from the same lab, is available on the FastMetal API today.
- What is the context window of GPT-5.1-Codex-Mini?
- 400,000 tokens, shared between the prompt and the response.