GPT-5.1-Codex Mini

reasoningdeprecatedproprietary

Status: Shut down · Succeeded by gpt-5.6-terra

Intelligence
Reasoning
Speed
Context
400K
Max output
128K
Input price
$0.25/1M tokens
Output price
$2/1M tokens

Capabilities

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

Details

Model IDgpt-5.1-codex-mini
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-5.6-terra
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs
Web Searchweb_search
Search the web for information

Endpoints

ResponsesPOST
Stateful multi-turn conversationshttps://api.openai.com/v1/responses

Pricing

Text tokensPer 1M tokens
InputCached inputOutput
Standard$0.25$0.025$2

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-codex-mini

GPT-5.1-Codex Mini

deprecated
gpt-5.1-codex-mini

Status: Shut down

gpt-5.1-codex-mini
Changes · 12 entries
gpt-5.1-codex-miniupdateca7a400Nov 2, 2026, 03:02 AM
nameGPT-5.1 Codex mini→GPT-5.1-Codex Mini
descriptionGPT-5.1 Codex mini is a smaller, more cost-effective, les...→Status: Shut down
deprecation_date2026-04-22
retirement_date2026-07-23
successorgpt-5.6-terra
gpt-5.1-codex-miniupdateb2f45bfOct 29, 2026, 03:29 AM
descriptionGPT-5.1-Codex Mini is a smaller, more cost-effective, les...→Status: Shut down
gpt-5.1-codex-miniupdate118451aSep 24, 2026, 07:08 AM
deprecation_date2026-04-22
retirement_date2026-07-23
successorgpt-5.6-terra
gpt-5.1-codex-miniupdatee3d7dedAug 31, 2026, 04:13 AM
nameGPT-5.1-Codex mini→GPT-5.1-Codex Mini
descriptionGPT-5.1-Codex mini is a smaller, more cost-effective, les...→GPT-5.1-Codex Mini is a smaller, more cost-effective, les...
gpt-5.1-codex-miniupdated68a4f1Jun 10, 2026, 02:10 AM
nameGPT-5.1 Codex mini→GPT-5.1-Codex mini
descriptionGPT-5.1 Codex mini is a smaller, more cost-effective, les...→GPT-5.1-Codex mini is a smaller, more cost-effective, les...
gpt-5.1-codex-miniupdate6a1e7e3Apr 24, 2026, 02:41 AM
statusactive→deprecated
gpt-5.1-codex-miniupdatefa2bbbbMar 24, 2026, 05:22 AM
capabilitiesjson modeno→yes
gpt-5.1-codex-miniupdatef43e286Mar 24, 2026, 04:45 AM
capabilitiesjson modeyes→nofine tuningno
gpt-5.1-codex-miniupdate1cd659eMar 24, 2026, 04:19 AM
capabilitiesjson modeyes
page_urlhttps://platform.openai.com/docs/models/gpt-5.1-codex-mini→https://developers.openai.com/api/docs/models/gpt-5.1-cod...
gpt-5.1-codex-miniupdate2b100acMar 23, 2026, 05:30 AM
licenseproprietary
page_urlhttps://platform.openai.com/docs/models/gpt-5.1-codex-mini
open_weightno
gpt-5.1-codex-miniupdateb50649fMar 21, 2026, 11:58 PM
pricingtiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
max_output_tokens100000→128000
knowledge_cutoff2024-09
reasoning_tokensyes
reasoning4
taglineSmaller, more cost-effective, less-capable version of GPT...
tools["function_calling","web_search"]
endpoints["responses"]
snapshots["gpt-5.1-codex-mini"]
gpt-5.1-codex-minicreate7f5c66fMar 21, 2026, 05:16 AM