o1 Preview

OpenAI

OpenAI reasoning model with chain-of-thought

Text Generation API GPT Family
Back to Models
Parameters
-
params
Context Window
128K
tokens
Max Output
33K
tokens
Input Price
$15.0000
per 1M tokens
Output Price
$60.0000
per 1M tokens

GPT Family Timeline 15 versions

GPT-5.4 Latest api
Mar 2026
GPT-5.4 Pro api
Mar 2026
GPT-5.3 Codex api
Feb 2026
GPT-5.2 Thinking api
Dec 2025
GPT-5.2 Pro api
Dec 2025
GPT-5.2 Instant api
Dec 2025
GPT-5.1 Instant api
Nov 2025
GPT-5.1 Thinking api
Nov 2025
GPT-5 api
Aug 2025
GPT-4o (Nov 2024) api
Nov 2024
o1 Preview Current api
Sep 2024
o1 Mini api
Sep 2024
GPT-4 Turbo api
Jan 2024
GPT-3.5 Turbo api
Nov 2023
GPT-4o (Azure) api
-

Capabilities

👁️
Vision
⚡
Function Calling
📋
JSON Mode
🌊
Streaming
💬
System Prompt
🖥️
Code Execution
🔍
Web Search
🔌
MCP Support

Details

Release Date
September 12, 2024
Knowledge Cutoff
October 1, 2023
Source
API
API Key Required
Yes
License
Proprietary
Model ID
o1-preview
Last updated: November 26, 2025