The Model Index
Models/Anthropic

Claude Haiku 4.5

AnthropicReleased 15 Oct 2025ClosedSmall / fastDate verified
137125–148Index score#98 of 229 models
3/ 8Core tests taken3 of 6 areas · plus 13 anchor tests
−17Versus the frontier at releasebest then: GPT-5
$1.0/ $5.0Price per million tokensinput / output, list price
200KContext windowtokens it reads at once

Where it sitson the frontier

Gemini 2.5 Pro reached this score 7 months earlier.

Test resultsby area · tick = best by any model

Reasoning & knowledgeevidence
GPQA Diamond
71%
Humanity's Last Exam
no result
Mathsevidence
FrontierMath T1-3
no result
Codingevidence
SWE-bench Verified
no result
Terminal-Bench
36%
Agentsevidence
APEX-Agents
no result
Novel problemsevidence
ARC-AGI-2
4%
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

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

Not in the top three among current models on any category we track.

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

Released15 Oct 2025
Announcementanthropic.com ↗
Release entryClaude Haiku 4.5
Scored asClaude Haiku 4.5
Artificial Analysis index–
Output speed–
Hugging Faceclosed weights

Anthropic releasesaround this one