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Claude Fable 5 vs Claude Opus 4.8

Claude Fable 5 scores higher than Claude Opus 4.8 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 Opus 4.8 at 47.8 (out of 100).

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

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Leaderboard by leaderboard

BoardClaude Fable 5Claude Opus 4.8Higher
LMArena
Elo (community votes)
1,626.81,555.2Claude Fable 5
LiveBench
global average (0-100)
8376.2Claude Fable 5
SimpleBench
AVG@5 % (private set)
81.964.8Claude Fable 5
Vals AI
Vals Index accuracy % · weighted finance + coding tasks
6660.9Claude Fable 5
Artificial Analysis
intelligence index · measured runs only
49.641.8Claude 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 Opus 4.8 at a glance

Developer
Anthropic
Status
Live since May 27, 2026

Live.

Full Claude Opus 4.8 tracker →

Claude Fable 5 vs Claude Opus 4.8: quick answers

Which is better, Claude Fable 5 or Claude Opus 4.8?

It depends on what you measure. Claude Fable 5 scores higher than Claude Opus 4.8 on all 5 public leaderboards that rate both. Claude Fable 5's widest lead is on LiveBench. 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 Opus 4.8 at 47.8 (out of 100).

Which is newer, Claude Fable 5 or Claude Opus 4.8?

Claude Fable 5. It went live on July 1, 2026, 35 days after Claude Opus 4.8 (May 27, 2026).

Who makes Claude Fable 5 and Claude Opus 4.8?

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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