Expired50% confidenceOpinionExact time

Reviewers consider Sonnet 5 to be possibly one of the worst models Anthropic has ever released, and recommend sticking with OPUS 4.8.

1

Sources

50%

Confidence

Medium-term (~90 days)

Relevance

7/22/2026

First Seen

This claim has expired. It is kept for the record and no longer describes the current state.

Valid until: 10/20/2026(expired)

Sources

Claude Sonnet 5 Deep Dive: Impressive Benchmarks, Disappointing Reality — Stick with OPUS 4.8

Related Claims

UnverifiedWhen assessing potentially dangerous cyber skills, Sonnet 5 performs notably weaker than Opus 4.8 and Mythos 574% similar UnverifiedAnthropic's system card acknowledges that Sonnet 5 lags behind Opus- and Mythos-class models in nearly all scenarios.69% similar

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