The Model Index
Models/OpenAI

o3

OpenAIReleased 16 Apr 2025ClosedReasoningDate verified
147136–158Index score#63 of 229 modelsPro mode: 148 · $20 / $80
6/ 8Core tests taken5 of 6 areas · plus 22 anchor tests
FrontierVersus the frontier at releaseset or matched the record
$2.0/ $8.0Price per million tokensinput / output, list price
200KContext windowtokens it reads at once

Where it sitson the frontier

Among the first models to reach this score.

Test resultsby area · tick = best by any model

Reasoning & knowledgeevidence
GPQA Diamond
82%
Humanity's Last Exam
20%
Mathsevidence
FrontierMath T1-3
33%
Codingevidence
SWE-bench Verified
62%
Terminal-Bench
no result
Agentsevidence
APEX-Agents
no result
Novel problemsevidence
ARC-AGI-2
7%
Long tasksevidence
METR time horizon
2.0 h

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

What others sayrank on each leaderboard

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

Best attop three among current models

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

Where to use itprices checked 1 Oct 2026

API providers 1 · per million tokens, in / out

OOpenAI$2.0 / $8.0cheapest

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

Facts and sources

Released16 Apr 2025
Announcementopenai.com ↗
Release entryo3 + o4-mini
Scored aso3
Artificial Analysis index20 (their estimate)
Pro modeindex 148 · $20 / $80 per M
Output speed106 tokens/s
Hugging Faceclosed weights

OpenAI releasesaround this one