The Model Index
Models/OpenAI

GPT-4.5

OpenAIReleased 27 Feb 2025ClosedFlagship
124113–136Index score#129 of 229 models
3/ 8Core tests taken2 of 6 areas · plus 10 anchor tests
−11Versus the frontier at releasebest then: o1Replaced by GPT-5
–Price per million tokensno public API price found
–Context windowtokens it reads at once

Where it sitson the frontier

o1 reached this score 3 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeevidence
GPQA Diamond
69%
Humanity's Last Exam
5%
Mathsevidence
FrontierMath T1-3
no result
Codingevidence
SWE-bench Verified
no result
Terminal-Bench
no result
Agentsno evidence yet
APEX-Agents
no result
Novel problemsevidence
ARC-AGI-2
1%
Long tasksno evidence yet
METR time horizon
no result

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

The Model Indexindependent tests, our method#129of 219 · 124
Epoch Capabilities Indexoverall capability from many benchmarks#116of 239 · 136.7

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

Replaced by GPT-5; it no longer leads any category 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

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

Released27 Feb 2025
Release entryGPT-4.5
Scored asGPT-4.5
Artificial Analysis index–
Output speed–
Hugging Faceclosed weights

OpenAI releasesaround this one