The Model Index
Models/Anthropic

Claude Fable 5

AnthropicReleased 9 Jun 2026ClosedFlagshipDate verified
185174–196Index score#6 of 229 models
4/ 8Core tests taken4 of 6 areas · plus 20 anchor tests
FrontierVersus the frontier at releaseset or matched the recordReplaced by Claude Fable 5.1
$10/ $50Price per million tokensinput / output, list price
1MContext 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
86%
Humanity's Last Exam
no result
Mathsevidence
FrontierMath T1-3
87%
Codingevidence
SWE-bench Verified
no result
Terminal-Bench
no result
Agentsevidence
APEX-Agents
64%
Novel problemsevidence
ARC-AGI-2
89%
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

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

Released9 Jun 2026
Announcementanthropic.com ↗
Release entryClaude Fable 5 + Mythos 5 (restricted)
Scored asClaude Fable 5
Artificial Analysis index–
Output speed–
Hugging Faceclosed weights

Anthropic releasesaround this one