[KongchangAI]
Unverified50% confidenceBenchmarkExact time

When asked for "Expression only" output of a cron expression, Haiku 4.5 put `15 3 * * *` in a code block every time, while Haiku 5.5 never did so.

1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/18/2026
First Seen
Valid until: 1/16/2027

Sources

Claude Haiku 4.5 vs 5.5: A Major Behavioral Shift Under the Same 100 Prompts

Related Entities

Claude Haiku 4.5modelHaiku 5.5model

Related Claims

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