Expired50% confidenceFactExact time
Anthropic's system card acknowledges that Sonnet 5 lags behind Opus- and Mythos-class models in nearly all scenarios.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/8/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 10/6/2026(expired)
Sources
Fable 5对决GPT-5.6 Sol：性价比重塑前沿AI格局
bilibili英文白斑马7/3/2026
Related Claims
UnverifiedWhen assessing potentially dangerous cyber skills, Sonnet 5 performs notably weaker than Opus 4.8 and Mythos 575% similarUnverifiedReviewers consider Sonnet 5 to be possibly one of the worst models Anthropic has ever released, and recommend sticking with OPUS 4.8.69% similarUnverifiedIn a document question-answering test, Haiku captured the additional layer of command-line arguments in a sub-agent priority question, while Sonnet missed it52% similar
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