Models / openai / GPT-5.1 Codex

GPT-5.1 Codex

JSON →
openaillm

An incremental update to GPT-5 Codex with improved code generation and debugging capabilities.

textcode-generationfunction-callingstreamingjson-modetool-usevisionprompt-cachingreasoning
homepage ↗docs ↗
Specs
Context & limits
272K
context window
128K
max output
Lifecycle
Dates
released2025-11-15
knowledge cutoff2025-06-01
Resources
homepagehttps://openai.com/index/gpt-5/ ↗
docshttps://platform.openai.com/docs/models ↗