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Claude Fable 5.1

by Anthropic

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors.

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Our verdict

Not reviewed yet

We have not reviewed Claude Fable 5.1 yet

No one at Enterprise DNA has checked this listing against its sources. The description comes from public listings gathered automatically. Any fact below shows where it came from and when it was last checked.

How we review records

From the listing

About Claude Fable 5.1

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors.

Best for

Long-running planning and code review

Notes

Claude Fable 5.1 is listed in the EDNA Models directory from the OpenRouter catalogue.

Pros

  • Planning a multi-step change with checkpoints
  • text, image, file input; text output on the listed OpenRouter route

Cons

  • Using a premium model before measuring simpler alternatives
  • Treating a long answer as proof the work was executed
  • Base text-token rates exclude other modalities, tools, caching, retries and any hosting-specific charges. Check actual usage before comparing cost per successful task.

Key facts

What we have checked

Input price
$10.00 per million tokens
Checked OpenRouter models API
Output price
$50.00 per million tokens
Checked OpenRouter models API
Price on amazon-bedrock
$0.250 per million cached input tokens
Checked OpenRouter models API
Price on amazon-bedrock
$10.00 per million input tokens
Checked OpenRouter models API
Price on amazon-bedrock
$50.00 per million output tokens
Checked OpenRouter models API
Price on anthropic
$0.250 per million cached input tokens
Checked OpenRouter models API
Price on anthropic
$10.00 per million input tokens
Checked OpenRouter models API
Price on anthropic
$50.00 per million output tokens
Checked OpenRouter models API
Price on azure
$0.250 per million cached input tokens
Checked OpenRouter models API
Frontiermath tiers 1 3 v2 private
90.2% (for 1 Sept 2026)
Checked Epoch AI (CC BY 4.0)
Simpleqa verified
70.8% (for 1 Sept 2026)
Checked Epoch AI (CC BY 4.0)
Arc agi 2
90% (for 1 Sept 2026)
Checked Epoch AI (CC BY 4.0)

Each value shows when we last confirmed it and where it came from. Values we have not confirmed are left out, never guessed.

API access

How to call it

Call via OpenRouter with model id `anthropic/claude-fable-5.1`.

  • openrouter · anthropic/claude-fable-5.1 · Docs

OpenRouter id: anthropic/claude-fable-5.1

Price

What Claude Fable 5.1 costs, over time

Input price

$10.00 to $10.00

US dollars per million input tokens. 3 Sept 2026 to 7 Nov 2026, 41 days.

Source: OpenRouter models API. Checked .

Output price

$50.00 to $50.00

US dollars per million output tokens. 3 Sept 2026 to 7 Nov 2026, 41 days.

Source: OpenRouter models API. Checked .

Prices by host

HostPriceOver timeChecked
amazon-bedrockCached input$0.250 per million cached input tokensSince 24 Oct 2026No change recordedOpenRouter models API
amazon-bedrockInput$10.00 per million input tokensSince 24 Oct 2026No change recordedOpenRouter models API
amazon-bedrockOutput$50.00 per million output tokensSince 24 Oct 2026No change recordedOpenRouter models API
anthropicCached input$0.250 per million cached input tokensSince 24 Oct 2026No change recordedOpenRouter models API
anthropicInput$10.00 per million input tokensSince 24 Oct 2026No change recordedOpenRouter models API
anthropicOutput$50.00 per million output tokensSince 24 Oct 2026No change recordedOpenRouter models API
azureCached input$0.250 per million cached input tokensSince 24 Oct 2026No change recordedOpenRouter models API
azureInput$10.00 per million input tokensSince 24 Oct 2026No change recordedOpenRouter models API
azureOutput$50.00 per million output tokensSince 24 Oct 2026No change recordedOpenRouter models API
google-vertexCached input$0.250 per million cached input tokensSince 24 Oct 2026No change recordedOpenRouter models API
google-vertexInput$10.00 per million input tokensSince 24 Oct 2026No change recordedOpenRouter models API
google-vertexOutput$50.00 per million output tokensSince 24 Oct 2026No change recordedOpenRouter models API

Usage

How much Claude Fable 5.1 is used

Tokens served a day

64.7B to 25.9B

tokens a day on OpenRouter. 19 Sept 2026 to 7 Nov 2026, 50 readings.

Source: OpenRouter model activity (741 of 741 series). Checked .

Scores

How Claude Fable 5.1 scores

Each score comes from the named source and shows when we last confirmed it. A flag means the score needs care.

ScoreValueSourceChecked
Artificial Analysis Intelligence Index50indexAs of 7 Nov 2026Artificial Analysis via OpenRouter
Artificial Analysis Coding Index81.6indexAs of 7 Nov 2026Artificial Analysis via OpenRouter
Artificial Analysis Agentic Index57.9indexAs of 7 Nov 2026Artificial Analysis via OpenRouter
LMArena text rating (Elo)1,513EloAs of 7 Nov 2026LMArena (CC-BY-4.0), published 2026-11-06
LMArena web development rating (Elo)1,746EloAs of 7 Nov 2026LMArena (CC-BY-4.0), published 2026-11-06
LMArena vision rating (Elo)1,321EloAs of 7 Nov 2026LMArena (CC-BY-4.0), published 2026-11-06
Design Arena rating (Elo)1,424EloAs of 7 Nov 2026Design Arena via OpenRouter
Apex agents (best-across-versions)68.6percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Arc agi (best-across-versions)97.5percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Arc agi 2 (best-across-versions)90percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Chess puzzles (best-across-versions)48percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Dtbench (best-across-versions)97.6percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Show 17 more scores
ScoreValueSourceChecked
Ebr bench (best-across-versions)57.1percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Frontiercode (best-across-versions)50.9percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Frontiermath tier 4 v2 private (best-across-versions)87.8percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Frontiermath tiers 1 3 v2 private (best-across-versions)90.2percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Frontierswe (best-across-versions)56.3percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Furniture assembly (best-across-versions)70percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Gso bench (best-across-versions)88.2percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Lmca (best-across-versions)65.5percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Mirrorcode (best-across-versions)73.3percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Mystery game puzzles (best-across-versions)58percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Otis mock aime 2024 2025 (best-across-versions)Saturated100percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Proofbench (best-across-versions)100percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Remote labor index (best-across-versions)17.9percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Simpleqa verified (best-across-versions)70.8percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Spireclimb (best-across-versions)2percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Weirdml (best-across-versions)92.9percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Weirdml v3 (best-across-versions)43.5percentAs of 1 Sept 2026Epoch AI (CC BY 4.0)
Saturated
Top models score close to the maximum, so this test no longer separates them.

Compare

Compare Claude Fable 5.1 side by side

Sources

Where this comes from

A source shows what was published when we checked it. It does not certify security, performance or a working installation. Read our method.

Changelog

What changed

No changes recorded yet. Releases, price changes and deprecations appear here, with their dates, once we track them for this record.

USAGE / OPENROUTER

How much Claude Fable 5.1 is used

Tokens processed through OpenRouter each day. It shows what developers actually run, not every company's private traffic.

Tokens, last 7 days
265B ▼23.5%
Requests, last 7 days
2.3M
Tool calls, last 7 days
1.3M
Intelligence score
50
People's vote
1513
Average cost per request
$22.40
Price per million tokens
$10 in · $50 out
0100B200B19 Sept: 64.7B tokens, 469K requests20 Sept: 57.3B tokens, 508K requests21 Sept: 78.4B tokens, 632K requests22 Sept: 77.5B tokens, 643K requests23 Sept: 55.2B tokens, 540K requests24 Sept: 107B tokens, 900K requests25 Sept: 169B tokens, 1.2M requests26 Sept: 81.9B tokens, 789K requests27 Sept: 49.2B tokens, 372K requests28 Sept: 76.6B tokens, 660K requests29 Sept: 71.3B tokens, 817K requests30 Sept: 66.8B tokens, 656K requests1 Oct: 63.6B tokens, 582K requests2 Oct: 37.1B tokens, 372K requests3 Oct: 26.2B tokens, 240K requests4 Oct: 28.1B tokens, 277K requests5 Oct: 33.1B tokens, 364K requests6 Oct: 40.4B tokens, 435K requests7 Oct: 53.7B tokens, 430K requests8 Oct: 47.6B tokens, 384K requests9 Oct: 53.4B tokens, 396K requests10 Oct: 42.2B tokens, 302K requests11 Oct: 72.8B tokens, 353K requests12 Oct: 42.1B tokens, 339K requests13 Oct: 48.1B tokens, 388K requests14 Oct: 41.8B tokens, 335K requests15 Oct: 58.6B tokens, 438K requests16 Oct: 36B tokens, 356K requests17 Oct: 33.2B tokens, 284K requests18 Oct: 30.1B tokens, 274K requests19 Oct: 46.5B tokens, 353K requests20 Oct: 44.5B tokens, 789K requests21 Oct: 42.9B tokens, 439K requests22 Oct: 46.2B tokens, 798K requests23 Oct: 86.6B tokens, 631K requests24 Oct: 42.3B tokens, 343K requests25 Oct: 39B tokens, 295K requests26 Oct: 49.2B tokens, 357K requests27 Oct: 53.8B tokens, 412K requests28 Oct: 57B tokens, 396K requests29 Oct: 55.1B tokens, 440K requests30 Oct: 52.5B tokens, 393K requests31 Oct: 39.7B tokens, 285K requests1 Nov: 36.3B tokens, 276K requests2 Nov: 46.4B tokens, 376K requests3 Nov: 48.7B tokens, 386K requests4 Nov: 37.5B tokens, 369K requests5 Nov: 36B tokens, 356K requests6 Nov: 34.2B tokens, 317K requests7 Nov: 25.9B tokens, 247K requests19 Sept3 Oct17 Oct31 Oct7 NovSee where it ranks on the leaderboard →

MODEL FIELD GUIDE / SOURCE EVIDENCE

What you can do with Claude Fable 5.1.

Specifications reviewed; no EDNA task evaluation has been run. Sources checked 2026-11-07. Hosting routes and app features can differ.

DeveloperAnthropic
Exact model identifieranthropic/claude-fable-5.1
Inputtext, image, file
Outputtext
Tool calling
Listed support
Structured output
Listed support
Reasoning controls
Listed support
Availability
available
Price basis
token
Licence verification
Check the developer licence; the model name is insufficient
Context length
1M tokens
Knowledge cutoff
Not established
Developer release date
Not established
First seen in the catalogue
1 Sept 2026
Listed retirement date
Not established

Base text-token rates exclude other modalities, tools, caching, retries and any hosting-specific charges. Check actual usage before comparing cost per successful task.

Consider it for

  • Planning a multi-step change with checkpoints
  • Reviewing a large implementation against a design

Watch for

  • Using a premium model before measuring simpler alternatives
  • Treating a long answer as proof the work was executed

PRACTICAL EXERCISE / NOT RUN BY ENTERPRISE DNA

Try the model on a small, checkable task.

Plan a migration from a single currency ledger to per-invoice currency. Identify schema, API, reports and rollback work; list dependencies and stop before running changes.

Check the result: The plan separates historical invoices from new ones and includes reconciliation and rollback checks.

Compare another approach

anthropic claude sonnet 5 5 ↗openai gpt 6 1 sol ↗
Inspect the sources and their scope
provider source ↗

Developer documentation for model family or task. OpenRouter route-specific properties remain catalogue claims; EDNA has not executed a task evaluation.

Checked 2026-10-19
catalogue source ↗

anthropic/claude-fable-5.1: listed route capabilities, availability and prices; provider endpoints can differ.

Checked 2026-11-07
openrouter.ai ↗

Source for reasoning controls, first seen, tool calling, context length, input, output, structured output.

Checked 2026-11-07
How to evaluate a model for your work →

FROM SPECIFICATIONS TO YOUR WORK

Is this the right model for your job?

Start with a realistic sample. These workflows match the model’s listed capabilities, not a verified result on your task.

Write a clear business documentWorkflow & starter prompt ↗Analyse a spreadsheetWorkflow & starter prompt ↗Research a companyWorkflow & starter prompt ↗Build an appWorkflow & starter prompt ↗Extract document dataWorkflow & starter prompt ↗Run a reliable agentWorkflow & starter prompt ↗

What would it cost?

Pick a common job and how many times a month you run it. Token sizes are our assumption for a typical run, shown under the result.

Working out the cost...

Token prices only. Per-request, image, tool, storage and subscription fees are not included. One token is about three quarters of an English word. Real counts vary by model and language. How tokens are counted ↗

Check the source

Price date: 7 Nov 2026, from OpenRouter models API. Prices are USD API token rates. Your app subscription, uploads, browsing and tools are separate.

Model source & availability ↗

Understand the evidence

Listed capabilities and third-party benchmark scores do not establish Enterprise DNA task-test results. Validate accuracy and total cost on your own sample.

Intelligence Index: 50 (2026-11-06) ↗Coding Index: 81.6 (2026-11-06) ↗Agentic Index: 57.9 (2026-11-06) ↗
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