OpenAI
GPT-5.1 Chat
gpt-codex
Model ID gpt-5.1-chat-latest
Provider OpenAI
Family gpt-codex
Status -
Knowledge Cutoff 2024-09-30
Release Date 2025-11-13
Input Modalities text, image
Output Modalities text
Context Window 128000
Input Limit -
Output Limit 16384
Tool Calling Yes
Reasoning Yes
Structured Output Yes
Temperature Control No
Open Weights No
Input Cost / 1M tokens $1.25
Output Cost / 1M tokens $10.00
Reasoning Cost / 1M tokens -
Cache Read Cost / 1M tokens $0.12
Cache Write Cost / 1M tokens -