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Claude Fable 5.1

AnthropicReleased Sep 1, 2026Current

Score basis

Claude Fable 5.1 is at the frontier in reasoning and coding; strong in long context, factuality, math, and agentic tasks; and behind the leaders in instruction following. Too few results yet to rate safety, multimodal tasks, or multilingual tasks.

Capability profile

Bars show the model's median result as a share of the leading model's, per capability. Select a row to see its results.

Frontier2 capabilities
  1. Reasoning−1.2%6 of 6
  2. Coding−4.3%7 of 10
Strong4 capabilities
  1. Long Context−4.4%1 of 3
  2. Factuality−5.6%3 of 4
  3. Math−5.8%5 of 5
  4. Agentic−7.1%5 of 7
Limited1 capability
  1. Instruction Following−34.4%1 of 3
Not rated3 capabilities

Too few results yet to rate Safety, Multimodal or Multilingual.

Price

$10.00input$50.00outputper million tokens

From Anthropic's own price page · 3 providers tracked · All prices

Costs more than 95% of 329 priced models · 3:1 input-to-output blend, log scale

Evidence

161results on82benchmarks

  • 25 independently verified
  • 75 aggregator
  • 44 vendor-reported
  • 17 cross-referenced

From 24 sources · latest Oct 17, 2026 · How verification works

API features

Tool callingStructured outputsReasoning

As listed by OpenRouter

Research

11 papers reference Claude Fable 5.1

Claude Fable 5.1 benchmark results

161 results on 82 benchmarks, grouped by capability. Each bar is the result as a share of the capability leader's; every result links to its source.

Reasoning

FrontierFull reasoning ranking

1.2% behind the leader6 of 6 ranked benchmarks measured

Show 19 more reasoning resultsHide 19 reasoning results

Coding

FrontierFull coding ranking

4.3% behind the leader7 of 10 ranked benchmarks measured

Show 8 more coding resultsHide 8 coding results

Long Context

StrongFull long context ranking

4.4% behind the leader1 of 3 ranked benchmarks measured

Show 4 more long context resultsHide 4 long context results

Factuality

StrongFull factuality ranking

5.6% behind the leader3 of 4 ranked benchmarks measured

Show 8 more factuality resultsHide 8 factuality results

Math

StrongFull math ranking

5.8% behind the leader5 of 5 ranked benchmarks measured

Agentic

StrongFull agentic ranking

7.1% behind the leader5 of 7 ranked benchmarks measured

Show 12 more agentic resultsHide 12 agentic results

Instruction Following

LimitedFull instruction following ranking

34.4% behind the leader1 of 3 ranked benchmarks measured

Multimodal

Not enough dataFull multimodal ranking

0 of 6 ranked benchmarks measured

More results

Benchmarks outside the capability baskets. They are not ranked against a leader.

Show 78 more resultsHide 78 results

Claude Fable 5.1: common questions

Who makes Claude Fable 5.1?

Claude Fable 5.1 is made by Anthropic.

When was Claude Fable 5.1 released?

Claude Fable 5.1 was released on Sep 1, 2026, according to Anthropic's own announcement.

What is Claude Fable 5.1 good at?

Claude Fable 5.1 is at the frontier in reasoning and coding; strong in long context, factuality, math, and agentic tasks; and behind the leaders in instruction following. Too few results yet to rate safety, multimodal tasks, or multilingual tasks.

How much does Claude Fable 5.1 cost?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens, according to Anthropic's own price page. We track its price at 3 providers. At a mix of three input tokens to one output token, it costs more than 95% of the 329 priced models we track.

How many benchmarks has Claude Fable 5.1 been tested on?

We track 161 results for Claude Fable 5.1 on 82 benchmarks from 24 sources, 25 of them independently verified. The latest was recorded on Oct 17, 2026.

Which API features does Claude Fable 5.1 support?

OpenRouter lists tool calling, structured outputs, and reasoning for Claude Fable 5.1.

About this record

Where Claude Fable 5.1's numbers come from, and every name it appears under.

Tracked since
Sep 1, 2026
Newest source mention
Oct 8, 2026

Where the results come from

Verification: 161 scores · 25 independently verified · 75 aggregator-attributed · 17 vendor cross-reference · 44 vendor-reported. How these tiers are assigned

From 24 sources on 12 sites. Artificial Analysis supplies 75 of them; the 25 independently verified results come from 7 sites. Bars are coloured by trust tier.

  • artificialanalysis.ai75
  • www-cdn.anthropic.com31
  • deepmind.google17
  • arcprize.org9
  • anthropic.com8
  • livebench.ai7
  • api.llm-stats.com5
  • epoch.ai3
  • datasets-server.huggingface.co2
  • labs.scale.com2
  • lmarena.ai1
  • simple-bench.com1

Also known as

How our sources name Claude Fable 5.1 at each reasoning setting.

SettingShort formLong formAPI id
lowclaude fable 5.1 (low with fallback) claude fable 5.1 (low)claude fable 5.1 (adaptive reasoning, low effort, default fallback)claude-fable-5-1-low
mediumclaude fable 5.1 (medium with fallback) claude fable 5.1 (medium)claude fable 5.1 (adaptive reasoning, medium effort, default fallback)claude-fable-5-1-medium
highclaude fable 5.1 (high with fallback) claude fable 5.1 (high)claude fable 5.1 (adaptive reasoning, high effort, default fallback)claude-fable-5-1-high
xhighclaude fable 5.1 (xhigh with fallback) claude fable 5.1 (xhigh)claude fable 5.1 (adaptive reasoning, xhigh effort, default fallback)claude-fable-5-1-xhigh fable-5.1 (claude code) xhigh
maxclaude fable 5.1 (max with fallback) claude fable 5.1 (max) claude fable 5.1 max fable 5.1 maxclaude fable 5.1 (adaptive reasoning, max effort, default fallback)—
Also listed asclaude fable5.1claude-fable-5-1claude-fable-5.1:batchfable 5.1fable 51