GPT-5.1 series

deprecatedproprietary

gpt-5.1 , gpt-5.1-codex , gpt-5.1-codex-mini

Intelligence
Reasoning
Speed
Context
400K
Max output
128K
Input price
$1.25/1M tokens
Output price
$10/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Batch Processing

Details

Model IDgpt-5.1
Provider Azure AI Foundry
Creator OpenAI
Familygpt-5.1
Licenseproprietary
Statusdeprecated
Typechat
Input modalitiestext
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window400K tokens
Max input—
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Deprecation date
Sourceofficial

Pricing

Text tokensPer 1M tokens
InputCached inputOutput
Standard$1.25$0.125$10

Family Comparison: gpt-5.1

ModelContextMax out
gpt-5.1-chat Preview128K16K
gpt-5.1-codex-max400K128K
gpt-5.1-codex-mini400K128K
gpt-5.1-codex400K128K
GPT-5.1 series400K128K

API

GET/v1/models/azure/gpt-5.1

GPT-5.1 series

deprecated
gpt-5.1

gpt-5.1 , gpt-5.1-codex , gpt-5.1-codex-mini

Changes · 6 entries
gpt-5.1updateca7a400Nov 2, 2026, 03:02 AM
descriptiongpt-5.1 , gpt-5.1-chat Preview , gpt-5.1-codex , gpt-5.1-...→gpt-5.1 , gpt-5.1-codex , gpt-5.1-codex-mini
gpt-5.1update17bcfbfSep 11, 2026, 06:36 AM
descriptiongpt-5.1 , gpt-5.1-chat Preview , gpt-5.1-codex , gpt-5.1-...→gpt-5.1 , gpt-5.1-codex , gpt-5.1-codex-mini
gpt-5.1updatec8065d6Apr 25, 2026, 10:39 AM
descriptionNEW gpt-5.1 , gpt-5.1-chat Preview , gpt-5.1-codex , gpt-...→gpt-5.1 , gpt-5.1-chat Preview , gpt-5.1-codex , gpt-5.1-...
gpt-5.1update6231fb5Apr 22, 2026, 02:50 AM
descriptionNEW gpt-5.1 , gpt-5.1-chat , gpt-5.1-codex , gpt-5.1-code...→NEW gpt-5.1 , gpt-5.1-chat Preview , gpt-5.1-codex , gpt-...
gpt-5.1update2b100acMar 23, 2026, 05:30 AM
model_typechat
descriptionNEW gpt-5.1 , gpt-5.1-chat , gpt-5.1-codex , gpt-5.1-code...
taglineNEW gpt-5.1 , gpt-5.1-chat , gpt-5.1-codex , gpt-5.1-code...
gpt-5.1create7f5c66fMar 21, 2026, 05:16 AM