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Claude Fable 5 vs Claude Sonnet 5

Claude Fable 5 scores higher than Claude Sonnet 5 on all 5 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 81.4 and Claude Sonnet 5 at 43.5 (out of 100).

Scores as published by each board; table composed September 24, 2026.

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Leaderboard by leaderboard

BoardClaude Fable 5Claude Sonnet 5Higher
LMArena
Elo (community votes)
1,626.81,542.5Claude Fable 5
LiveBench
global average (0-100)
8376Claude Fable 5
SimpleBench
AVG@5 % (private set)
81.960.6Claude Fable 5
Vals AI
Vals Index accuracy % · weighted finance + coding tasks
6659.6Claude Fable 5
Artificial Analysis
intelligence index · measured runs only
49.638.2Claude Fable 5

Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.

Claude Fable 5 at a glance

Developer
Anthropic
Status
Live since July 1, 2026

Returned Jul 1.

Full Claude Fable 5 tracker →

Claude Sonnet 5 at a glance

Developer
Anthropic
Status
Live since June 30, 2026

Shipped Jun 30.

Full Claude Sonnet 5 tracker →

Claude Fable 5 vs Claude Sonnet 5: quick answers

Which is better, Claude Fable 5 or Claude Sonnet 5?

It depends on what you measure. Claude Fable 5 scores higher than Claude Sonnet 5 on all 5 public leaderboards that rate both. Claude Fable 5's widest lead is on SimpleBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5 is at 81.4 and Claude Sonnet 5 at 43.5 (out of 100).

Which is newer, Claude Fable 5 or Claude Sonnet 5?

Claude Fable 5. It went live on July 1, 2026, 1 day after Claude Sonnet 5 (June 30, 2026).

Who makes Claude Fable 5 and Claude Sonnet 5?

Both are from Anthropic.

Where do these numbers come from?

Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 24, 2026). Boards measure different things, so raw scores are only comparable within a row.

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