Azure Cognitive ServicesGPT-5.1 Chat model ID, context window & pricing
gpt-codex
Quick facts
Model ID gpt-5.1-chat
Source Azure Cognitive Services
Context Window 128000
Pricing $1.25 input / $10.00 output per 1M tokens
Capabilities tool calling, reasoning, structured output
Model overview
GPT-5.1 Chat is an AI model from Azure Cognitive Services with 128000 token context window and text, image, audio input support.
Published pricing is $1.25 input and $10.00 output per 1M tokens.
- Workloads that use text, image, audio inputs with text, image, audio outputs.
- Agent and tool workflows that need function calling.
- Reasoning-heavy prompts where stepwise problem solving matters.
Model ID gpt-5.1-chat
Provider Azure Cognitive Services
Family gpt-codex
Status -
Knowledge Cutoff 2024-09-30
Release Date 2025-11-14
Input Modalities text, image, audio
Output Modalities text, image, audio
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 -