Opus 5.5’s performance in internal evaluations
A user calls Opus 5.5 “by far the best-performing model” across all of their internal evaluations.
TLDR
On September 25, 2026, a user praised Opus 5.5 as “a different beast,” saying it was the best-performing model by far across all of their internal evaluations at that time. They also congratulated the Anthropic team.
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Opus 5.5’s performance in internal evaluations
A user calls Opus 5.5 “by far the best-performing model” across all of their internal evaluations.
TLDR
On September 25, 2026, a user praised Opus 5.5 as “a different beast,” saying it was the best-performing model by far across all of their internal evaluations at that time. They also congratulated the Anthropic team.