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||Anthropic All models

Announcements Chatter Podcasts Policy The week Models Connect your AI

Claude Fable 5.1

Name: Claude Fable 5.1
Brand: Anthropic

Announcements Chatter Podcasts Policy The week Models Connect your AI

Anthropic modelsSonnet 5.5 Opus 5.5 Mythos 5.1 Fable 5.1 Opus 5 Sonnet 5 Fable 5 Opus 4.8

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts
2
platforms carry itAmazon, GitHub

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts
2
platforms carry itAmazon, GitHub

Anthropic·All models

Anthropic models

Claude Haiku 5.57 Oct

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Claude Fable 5.1 · Anthropic — forck

||Anthropic All models

Announcements Chatter Podcasts Policy The week Models Connect your AI

Claude Fable 5.1

Announcements Chatter Podcasts Policy The week Models Connect your AI

Anthropic modelsSonnet 5.5 Opus 5.5 Mythos 5.1 Fable 5.1 Opus 5 Sonnet 5 Fable 5 Opus 4.8

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts
2
platforms carry itAmazon, GitHub

So far

1 Sep
announced2026
2
posts about itFirst-party
6
outlets reportedOn its posts
2
platforms carry itAmazon, GitHub

Anthropic·All models

Anthropic models

Claude Haiku 5.57 Oct

Claude Sonnet 5.5

28 Sep

Claude Opus 5.522 Sep

Claude Mythos 5.11 Sep

+12 →

Launch

Anthropic· 1 Sep

Introducing Claude Fable 5.1 and Claude Mythos 5.1

Claude Fable 5.1 costs 25% less than Fable 5 for typical workloads.

Most coveredNew model

TestingCatalog: “Anthropic launches Claude Fable 5.1 and Mythos 5.1”

Reporting · 6 outlets

Image from anthropic.com

Anthropic· 1 Sept

Introducing Claude Fable 5.1 and Claude Mythos 5.1

Where to run it

Claude Fable 5.1 is generally available in GitHub Copilot

Claude Fable 5.1 now available in GitHub Copilot for Pro+, Max, Business, Enterprise users

GitHub1 Sep

Introducing Claude Fable 5.1 on AWS

Claude Fable 5.1 now available on Amazon Bedrock and Claude Platform on AWS.

Amazon1 Sep

How it measures

Artificial Analysis · Intelligence Index · Max, Default Fallback

53.46thof 696 models

Coding index81.6 · 1st

Median 12.5Top 57.6

Benchmarks, as Artificial Analysis ran them

94%GPQA Diamond
59%Humanity's Last Exam
52%Terminal-Bench 4.0
91%Terminal-Bench 2.1
63%SciCode
47%τ²-Bench Banking
85%Long context reasoning

Speed: 72.4 tokens/s
First answer: 200.3 s; thinking included
Per 1M tokens: $10.00 in · $50.00 out
Context: 1M tokens

LMArena · Text6thof 417

1Gemini 4 Argon (High)
2Muse Wonder (Max)
3Claude Opus 5.5 (High)
4Claude Fable 5 (High)

Claude Fable 5.1 (Max) · 1,503 (1,497–1,509) · 15,623 votes

Rated by versionClaude FableLevel with Claude Fable 5.

Claude Fable 5.1 · 1,503 (1,497–1,509) · 6th

Against list priceRating for the price

Claude Fable 5.1 · 1,503 · $20.00 per 1M tokens ($10.00 in, $50.00 out) · 1M context

LMArena, CC BY 4.0, 20 October 2026 · prices OpenRouter, list price blended 3:1, read 21 October 2026 · Artificial Analysis, read 21 October 2026

Everything else, by date

How Block orchestrates Claude Fable across thousands of pull requests8 Oct

About the model

Lab: Anthropic
Price: cost an estimated 25% less than Fable 5 for typical workloads
Released: 1 September 2026, per models.dev
OpenRouter: Listed 1 September 2026anthropic/claude-fable-5.1

Ask your AI

Your brief, straight from the record

Connect once, then ask Claude or ChatGPT what changed for the tools you use. Every item links to its page on forck.live.

+ any MCP app

Connect your AI →

About the model

Lab: Anthropic
Price: cost an estimated 25% less than Fable 5 for typical workloads
Released: 1 September 2026, per models.dev
OpenRouter: Listed 1 September 2026anthropic/claude-fable-5.1

Ask your AI

Your brief, straight from the record

Connect once, then ask Claude or ChatGPT what changed for the tools you use. Every item links to its page on forck.live.

+ any MCP app

Connect your AI →