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Side-by-side comparison · models

Claude Fable 5 vs Claude Fable 5.1

What we have checked about each, line by line. Every value shows where it came from and when we last confirmed it.

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Models

Claude Fable 5

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.

64 checked values

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Models

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.

56 checked values

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Checked facts

Line by line

Claude Fable 5 vs Claude Fable 5.1, compared on checked facts
MeasureClaude Fable 5Claude Fable 5.1
Input price$10.00 per million tokensChecked OpenRouter models API$10.00 per million tokensChecked OpenRouter models API
Output price$50.00 per million tokensChecked OpenRouter models API$50.00 per million tokensChecked OpenRouter models API
Price on amazon-bedrock$1.00 per million cached input tokensChecked OpenRouter models API$0.250 per million cached input tokensChecked OpenRouter models API
Price on amazon-bedrock$10.00 per million input tokensChecked OpenRouter models API$10.00 per million input tokensChecked OpenRouter models API
Price on amazon-bedrock$50.00 per million output tokensChecked OpenRouter models API$50.00 per million output tokensChecked OpenRouter models API
Price on anthropic$1.00 per million cached input tokensChecked OpenRouter models API$0.250 per million cached input tokensChecked OpenRouter models API
Price on anthropic$10.00 per million input tokensChecked OpenRouter models API$10.00 per million input tokensChecked OpenRouter models API
Price on anthropic$50.00 per million output tokensChecked OpenRouter models API$50.00 per million output tokensChecked OpenRouter models API
Price on azure$1.00 per million cached input tokensChecked OpenRouter models API$0.250 per million cached input tokensChecked OpenRouter models API
Price on azure$10.00 per million input tokensChecked OpenRouter models API$10.00 per million input tokensChecked OpenRouter models API
Price on azure$50.00 per million output tokensChecked OpenRouter models API$50.00 per million output tokensChecked OpenRouter models API
Price on claude-on-aws$1.00 per million cached input tokensChecked OpenRouter models APINot checked yet
Price on claude-on-aws$10.00 per million input tokensChecked OpenRouter models APINot checked yet
Price on claude-on-aws$50.00 per million output tokensChecked OpenRouter models APINot checked yet
Price on google-vertex$1.00 per million cached input tokensChecked OpenRouter models API$0.250 per million cached input tokensChecked OpenRouter models API
Price on google-vertex$10.00 per million input tokensChecked OpenRouter models API$10.00 per million input tokensChecked OpenRouter models API
Price on google-vertex$50.00 per million output tokensChecked OpenRouter models API$50.00 per million output tokensChecked OpenRouter models API
Latest versionanthropic/claude-5-fable-20260609Checked OpenRouter models APIanthropic/claude-fable-5.1-20260831Checked OpenRouter models API
Time to first token (ms)115,760Checked Artificial Analysis115,050Checked Artificial Analysis
Time to first token (ms) on amazon-bedrock4,485Checked OpenRouter models API6,488Checked OpenRouter models API
Time to first token (ms) on anthropic3,508Checked OpenRouter models API3,702Checked OpenRouter models API
Time to first token (ms) on azure5,491Checked OpenRouter models API2,679Checked OpenRouter models API
Time to first token (ms) on claude-on-aws3,449Checked OpenRouter models APINot checked yet
Time to first token (ms) on google-vertex2,784Checked OpenRouter models API3,332Checked OpenRouter models API
Output speed (tokens a second)66.3Checked Artificial Analysis59.8Checked Artificial Analysis
Output speed (tokens a second) on amazon-bedrock42Checked OpenRouter models API51Checked OpenRouter models API
Output speed (tokens a second) on anthropic56Checked OpenRouter models API63Checked OpenRouter models API
Output speed (tokens a second) on azure61Checked OpenRouter models API46Checked OpenRouter models API
Output speed (tokens a second) on claude-on-aws50Checked OpenRouter models APINot checked yet
Output speed (tokens a second) on google-vertex57Checked OpenRouter models API58Checked OpenRouter models API
Tokens served on OpenRouter in a day4.6B (for 10 Nov 2026)Checked OpenRouter model activity (748 of 748 series)27.1B (for 10 Nov 2026)Checked OpenRouter model activity (748 of 748 series)
Tool calls on OpenRouter in a day23.1K (for 10 Nov 2026)Checked OpenRouter model activity (748 of 748 series)121.1K (for 10 Nov 2026)Checked OpenRouter model activity (748 of 748 series)
Artificial Analysis Intelligence Index49.6Checked Artificial Analysis via OpenRouter50Checked Artificial Analysis via OpenRouter
Artificial Analysis Coding Index76.5Checked Artificial Analysis via OpenRouter81.6Checked Artificial Analysis via OpenRouter
Artificial Analysis Agentic Index50.7Checked Artificial Analysis via OpenRouter57.9Checked Artificial Analysis via OpenRouter
LMArena text rating (Elo)1,492Checked LMArena (CC-BY-4.0), published 2026-11-091,512Checked LMArena (CC-BY-4.0), published 2026-11-09
LMArena web development rating (Elo)1,625Checked LMArena (CC-BY-4.0), published 2026-11-091,742Checked LMArena (CC-BY-4.0), published 2026-11-09
LMArena vision rating (Elo)1,326Checked LMArena (CC-BY-4.0), published 2026-11-091,322Checked LMArena (CC-BY-4.0), published 2026-11-09
Design Arena rating (Elo)1,329Checked Design Arena via OpenRouter1,397Checked Design Arena via OpenRouter
Gpqa diamond85.9% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)Not checked yet
Frontiermath tiers 1 3 v2 private87% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)90.2% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Simpleqa verified70.7% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)70.8% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Arc agi 289.2% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)90% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Apex agents63.6% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)68.6% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Arc agi98.5% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)97.5% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Chess puzzles47% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)48% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Dtbench98.4% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)97.6% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Ebr bench39.5% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)57.1% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Frontiercode53.5% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)50.9% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Frontiermath tier 4 v2 private90.2% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)87.8% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Frontierswe47% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)56.3% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Furniture assembly35.8% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)70% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Gso bench78.4% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)88.2% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Lmca61.2% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)65.5% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Mirrorcode63.9% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)73.3% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Mystery game puzzles52% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)58% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Posttrainbench41.8% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)Not checked yet
Proofbench95% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)100% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Remote labor index16.1% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)17.9% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Simplebench81.9% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)Not checked yet
Surface evolver bench95% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)Not checked yet
Weirdml91.9% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)92.9% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Weirdml v327.9% (for 9 June 2026)Checked Epoch AI (CC BY 4.0)43.5% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
Otis mock aime 2024 2025100% (saturated benchmark: the top models all score near the ceiling) (for 9 June 2026)Checked Epoch AI (CC BY 4.0)100% (saturated benchmark: the top models all score near the ceiling) (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)
SpireclimbNot checked yet2% (for 1 Sept 2026)Checked Epoch AI (CC BY 4.0)

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