Anthropic · model

Claude Sonnet 5.5 (xhigh with fallback) benchmark scores

Name: benchgap: LLM benchmark scores, measured and estimated
Creator: benchgap

As of 2026-10-07, Claude Sonnet 5.5 (xhigh with fallback) (Anthropic) has measured scores on 2 benchmarks and estimated scores on 1 more.

Benchmark	Score	Source
Terminal-Bench 2.1	88.2%	estimated ± 4.0 pp, high confidence
Terminal-Bench 4.0	57.1%	measured
Terminal-Bench Science 0.1	52.4%	measured