Anthropic
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work.
This model is still tracked for research and discovery, but it is excluded from default public rankings until it returns to active status.
29.7
Quality Score
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Arena ELO
Undisclosed
Parameters
1M
Context
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model belongs to a benchmark-expected category, but stable public benchmark evidence has not been ingested yet.
A full normalized benchmark row is not available for this model yet.
This usually means public benchmark sources have not published stable data for this release yet.
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Jun 2026
Released