o1 Preview

reasoningdeprecatedproprietary

Status: Shut down · Succeeded by o3

Intelligence
Reasoning
Speed
Context
128K
Max output
33K
Input price
$15/1M tokens
Output price
$60/1M tokens
Snapshots

Capabilities

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

Details

Model IDo1-preview
Provider OpenAI
Creator openai
Familyo1
Licenseproprietary
Statusdeprecated
Typereasoning
Input modalitiestext
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window128K tokens
Max input—
Max output33K tokens
Reasoning tokensYes
Knowledge cutoff
Release date
Deprecation date
Retirement date
Successoro3
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Endpoints

Chat CompletionsPOST
Generate chat responses with messageshttps://api.openai.com/v1/chat/completions
AssistantsPOST
Persistent assistants with tools and fileshttps://api.openai.com/v1/assistants

Pricing

Text tokensPer 1M tokens
InputCached inputOutput
Standard$15$7.5$60

Family Comparison: o1

ModelContextMax outPricing
o1-mini128K66K$1.1$4.4
o1 Preview128K33K$15$60
o1200K100K$15$60
o1-pro200K100K$150$600

API

GET/v1/models/openai/o1-preview

o1 Preview

deprecated
o1-preview

Status: Shut down

o1-preview-2024-09-12
Changes · 12 entries
o1-previewupdateca7a400Nov 2, 2026, 03:02 AM
descriptionResearch preview of the o1 series of models, trained with...→Status: Shut down
successoro1→o3
deprecation_date2025-04-28
retirement_date2025-07-28
pricinginput$15output$60cached input$7.5tiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
o1-previewupdateb2f45bfOct 29, 2026, 03:29 AM
descriptionResearch preview of the o1 series of models, trained with...→Status: Shut down
o1-previewupdate118451aSep 24, 2026, 07:08 AM
successoro1→o3
deprecation_date2025-04-28
retirement_date2025-07-28
pricinginput$15output$60cached input$7.5tiers[{"label":"Text tokens","unit":"Per 1M tokens","columns":...
o1-previewupdatee8ec634Mar 24, 2026, 07:27 PM
knowledge_cutoff2023-09→2023-10
o1-previewupdatefa2bbbbMar 24, 2026, 05:22 AM
capabilitiesjson modeno→yes
o1-previewupdatef43e286Mar 24, 2026, 04:45 AM
capabilitiesjson modeyes→novisionnofine tuningno
o1-previewupdate1cd659eMar 24, 2026, 04:19 AM
knowledge_cutoff2023-10→2023-09
capabilitiesjson modeyes
page_urlhttps://platform.openai.com/docs/models/o1-preview→https://developers.openai.com/api/docs/models/o1-preview
o1-previewupdateb301ebeMar 23, 2026, 11:47 PM
knowledge_cutoff2023-09→2023-10
o1-previewupdate2b100acMar 23, 2026, 05:30 AM
licenseproprietary
release_date2024-09-12
page_urlhttps://platform.openai.com/docs/models/o1-preview
open_weightno
tools["function_calling"]
o1-previewupdateb50649fMar 21, 2026, 11:58 PM
pricinginput$15output$60cached input$7.5batch input$7.5batch output$30
knowledge_cutoff2023-09
reasoning_tokensyes
reasoning3
capabilitiesstreamingyestool callyesstructured outputyesreasoningyes
endpoints["chat_completions","assistants"]
taglinePreview of our first o-series reasoning model
successoro1
o1-previewupdatec9a70c5Mar 21, 2026, 08:12 AM
pricinginput$15output$60cached input$7.5batch input$7.5batch output$30
o1-previewcreate7f5c66fMar 21, 2026, 05:16 AM