Unverified50% confidenceBenchmarkExact time
In the LSCBench leaderboard, Claude Fable 5 within Claude Code has a functional pass rate of 91.1% and a functional+security pass rate of 25.1%, the highest security pass rate among the six models.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/16/2026
First Seen
Valid until: 1/14/2027
Sources
Related Entities
Related Claims
UnverifiedAfter the researchers added a sentence to four models requiring them to implement "ensuring security while meeting functional requirements," GPT-5.6-Sol's functional + security pass rate rose from 24.7% to 46.2%, GLM-5.3 from 21.3% to 38.2%, Qwen3.8-Max from 22.0% to 37.6%, and DeepSeek-V4-Pro from 18.0% to 19.1%.68% similarUnverifiedState-of-the-art supervised models on the LIAR benchmark still hover around 28%–32% six-class accuracy.65% similarUnverifiedClaude Opus 5 approaches Fable-level performance on the FrontierCode 1.1 benchmark while costing only half as much65% similarUnverifiedClaude Haiku 5.5 scored 58.4% on the FrontierCode 1.1 benchmark.65% similar
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