Expired50% confidenceFactExact time
The previous-generation Claude OPUS had a success rate of only 1.4% on a certain high-difficulty leaderboard, whereas Fable 5 reached approximately 30%, an improvement of more than 20 times.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
Claude Fable 5 Deep Dive: An AI That Works 9 Hours Straight — Are Programmers Really Being Replaced?
bilibiliMr克劳德Claude6/11/2026
Related Claims
UnverifiedClaude Opus 5 scored 30.2% on ARC-AGI-3, compared to only 1.5% for the previous generation.74% similarUnverifiedOpus 5's pass rate at Low Effort is approximately 60%, surpassing Opus 4.8's 59% at the Max level, for which the per-task cost is as high as $13.73% similarUnverifiedClaude Opus 4.8 reached 85.9% on the GraphWalks 256K subset (up from 76.9% for 4.7) and 68.1% on the full 1-million-token version, nearly double Opus 4.7's score of 40.3%73% similarUnverifiedClaude Opus 4.8 achieved a score of 1890 in agentic performance benchmarks, 137 points higher than the previous generation and 121 points ahead of GPT 5.5.72% similarUnverifiedClaude Opus 5's capabilities are close to the level of the previous-generation flagship Opus, but with significantly reduced inference costs.71% similar
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