GPT-5.1 Codex
openai/gpt-5.1-codex
Codex GPT for repository edits, code review, and practical software agents
Capabilities
ReasoningYes
Tool callingYes
Structured outputYes
TemperatureFixed
AttachmentYes
Open weightsNo
Limits
Context400,000 tokens
Max input272,000 tokens
Max output128,000 tokens
Details
Familygpt-codex
Knowledge cutoff2024-09-30
Release date2025-11-13
Last updated2025-11-13
Modalities
Inputtext, image
Outputtext
Community Rating
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Pricing
Cost per 1M tokens
InputN/A
OutputN/A