o1 Preview

Preview of our first o-series reasoning model

OpenAIo1-previewReport incorrect data

Specs

Context: 128K
Max output: 32.8K
Input price: $15/ 1M tokens
Output price: $60/ 1M tokens
Released: —

Context

Context window: 128K
Max input: —
Max output: 32.8K

Pricing · USD / 1M tokens

Input: $15
Output: $60
Cache read: $7.5
Cache write: —

Modalities

Input: Text
Output: Text

API

API types: chat

Reasoning

Reasoning: Yes
Levels: —

Info

Status: Retired
Released: —
Knowledge cutoff: 2023-10-01

Features

Confirmed: toolsstructured_outputstreaming

How to call

openaimodel = o1-preview

chat

POSThttps://api.openai.com/v1/chat/completions

JSON

o1-preview.json

{
  "id": "o1-preview",
  "object": "model",
  "created": null,
  "owned_by": "openai",
  "name": "o1 Preview",
  "api": {
    "types": [
      "chat"
    ]
  },
  "limits": {
    "context": 128000,
    "input": null,
    "output": 32768
  },
  "modalities": {
    "input": [
      "text"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": true,
    "efforts": []
  },
  "pricing": {
    "currency": "USD",
    "unit": "1M_tokens",
    "input": 15,
    "output": 60,
    "cache_read": 7.5,
    "cache_write": null
  },
  "features": [
    "tools",
    "structured_output",
    "streaming"
  ],
  "info": {
    "status": "retired",
    "release_date": null,
    "knowledge_cutoff": "2023-10-01",
    "description": "Preview of our first o-series reasoning model",
    "docs": "https://developers.openai.com/api/docs/models/o1-preview",
    "verified_at": "2026-10-11"
  }
}

Official sources

o1 Preview Model | OpenAI APIdevelopers.openai.com2026-10-11 Deprecations | OpenAI APIdevelopers.openai.com2026-10-11