Claude Sonnet 5

Closed

Anthropic announced Claude Sonnet 5 on 2026-06-30 and reported Claude API access the same day. The evaluated checkpoint in later comparisons and current availability are unknown.

Benchmark scores

Terminal-Bench 4.0 · Reported by the model's maker, Sep 28, 202610.3%#5 of 5 results
CursorBench 4.0 · Reported by the model's maker, Sep 28, 202634.1%#4 of 4 results
Humanity's Last Exam · Reported by the model's maker, Sep 28, 202654.9%#4 of 4 results

Access

Anthropic reported same-day Claude API access under claude-sonnet-5 on 2026-06-30. Current access, retirement and the checkpoint used in later evaluations are unknown; a formal general-availability date is not established.