o1 Model Specs, Costs & Benchmarks (November 2025)

o1, developed by OpenAI, features a context window of 200K tokens. The model costs $15.00 per million tokens for input and $60.00 per million tokens for output. It was released on December 17, 2024, and has achieved impressive scores in various benchmarks.

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Overview

	o1
Model Provider The organization behind this AI's development	OpenAI
Input Context Window Maximum input tokens this model can process at once	200K tokens
Output Token Limit Maximum output tokens this model can generate at once	100K tokens
Release Date When this model first became publicly available	December 17, 2024 11 months ago December 17th, 2024

Pricing

	o1
Input Token Cost Cost per million input tokens	$15.00 per million tokens
Output Token Cost Cost per million output tokens	$60.00 per million tokens

Capabilities & Features

	o1
Input Types Supported input formats	textimagefile
Output Types Supported output formats	text
Tokenizer Text encoding system	GPT
Key Features Advanced capabilities	✓ Function Calling✓ Structured Output✓ Content Moderation

Benchmarks

	o1
MMLU Measures knowledge across 57 subjects like law, math, history, and science	Not available
MMMU Measures understanding of combined text and images across various domains	Not available
HellaSwag Measures common sense reasoning by having models complete sentences about everyday situations	Not available