GPT-5.1

reasoningdeprecatedproprietary

Status: Deprecated · Succeeded by gpt-6-sol

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

Capabilities

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

Details

Provider OpenAI
Creator openai
Familygpt-5.1
Licenseproprietary
Statusdeprecated
Typereasoning
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window400K tokens
Max input—
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Deprecation date
Retirement date
Successorgpt-6-sol
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs
Web Searchweb_search
Search the web for information
File Searchfile_search
Search across uploaded files
Image Generationimage_generation
Generate images inline
Code Interpretercode_interpreter
Execute code in a sandbox
Apply Patchapply_patch
Apply code patches to files
MCPmcp
Connect to Model Context Protocol servers

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.openai.com/v1/chat/completions
ResponsesPOST
Stateful multi-turn conversationshttps://api.openai.com/v1/responses
BatchPOST
Async batch processing at lower costhttps://api.openai.com/v1/batches

Pricing

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

Family Comparison: gpt-5.1

ModelContextMax outPricing
GPT-5.1-Codex Mini400K128K$0.25$2
GPT-5.1 Chat128K16K$1.25$10
GPT-5.1-Codex-Max400K128K$1.25$10
GPT-5.1-Codex400K128K$1.25$10
gpt-5.1-latest——$1.25$10
GPT-5.1400K128K$1.25$10

API

GET/v1/models/openai/gpt-5.1

GPT-5.1

deprecated

Status: Deprecated

gpt-5.1-2025-11-13
Changes · 12 entries
gpt-5.1updateca7a400Nov 2, 2026, 03:02 AM
descriptionGPT-5.1 is our flagship model for coding and agentic task...→Status: Deprecated
statusactive→deprecated
model_typechat→reasoning
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...→[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
tools["function_calling"]→["function_calling","web_search","file_search","image_gen...
endpoints["responses","chat_completions","batch"]→["chat_completions","responses","batch"]
page_urlhttps://developers.openai.com/api/docs/models/gpt-5.1?sna...→https://developers.openai.com/api/docs/models/gpt-5.1
deprecation_date2026-10-01
retirement_date2027-04-01
successorgpt-6-sol
gpt-5.1updateb2f45bfOct 29, 2026, 03:29 AM
descriptionGPT-5.1 is our flagship model for coding and agentic task...→Status: Deprecated
gpt-5.1update4e8b6afOct 21, 2026, 06:35 AM
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...→[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
gpt-5.1update2b89bf1Oct 2, 2026, 06:39 AM
statusactive→deprecated
deprecation_date2026-10-01
retirement_date2027-04-01
successorgpt-6-sol
gpt-5.1update118451aSep 24, 2026, 07:08 AM
descriptionGPT-5.1 is our flagship model for coding and agentic task...→GPT-5.1 is our flagship model for coding and agentic task...
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...→[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
endpoints["responses","chat_completions","batch"]→["chat_completions","responses","batch"]
gpt-5.1updatee3d7dedAug 31, 2026, 04:13 AM
model_typechat→reasoning
tools["function_calling"]→["function_calling","web_search","file_search","image_gen...
page_urlhttps://developers.openai.com/api/docs/models/gpt-5.1?sna...→https://developers.openai.com/api/docs/models/gpt-5.1
gpt-5.1updatefa2bbbbMar 24, 2026, 05:22 AM
capabilitiesjson modeno→yes
gpt-5.1updatef43e286Mar 24, 2026, 04:45 AM
capabilitiesjson modeyes→nofine tuningnobatchyes
gpt-5.1update1cd659eMar 24, 2026, 04:19 AM
capabilitiesjson modeyes
page_urlhttps://platform.openai.com/docs/models/gpt-5.1→https://developers.openai.com/api/docs/models/gpt-5.1?sna...
gpt-5.1update2b100acMar 23, 2026, 05:30 AM
model_typereasoning→chat
tools["function_calling","web_search","file_search","image_gen...→["function_calling"]
licenseproprietary
page_urlhttps://platform.openai.com/docs/models/gpt-5.1
open_weightno
release_date2025-11-13
gpt-5.1updateb50649fMar 21, 2026, 11:58 PM
namegpt-5.1→GPT-5.1
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
knowledge_cutoff2024-09
reasoning_tokensyes
reasoning4
taglineThe best model for coding and agentic tasks with configur...
tools["function_calling","web_search","file_search","image_gen...
endpoints["responses","chat_completions","batch"]
gpt-5.1create7f5c66fMar 21, 2026, 05:16 AM