o3

by OpenAI

o-series family

Parameters

—

Context window

200K tokens

Released

2025-04-01

Input price / 1M tok

$60.00

Output price / 1M tok

$240.00

Modality

multimodal, vision, tools

About o3

OpenAI's second-gen reasoning model. State-of-the-art on ARC-AGI, competition math, and expert-level science benchmarks. Very expensive per token; typically reserved for research and highest-stakes agent use.

Strengths

Top-1 reasoning benchmark scores
Native tool use
Vision

Weaknesses

Very expensive
Slow
Overkill for typical chat workloads

Best for

Research agentsMath/scienceComplex code review

Vendor page →