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Claude Code characterClaude Sonnet 5.5 character

Claude Sonnet 5.5 and Claude Code

2 products from Anthropic

Benchmark

Sonnet 5.5 in Claude Code scores 61.8% on Terminal-Bench 4.0

Claude Code with Sonnet 5.5 at max effort resolved 61.82% (plus or minus 2.9, 330 trials, $7,333.64 total cost), second on the leaderboard. Posted October 6, 2026.

Source

"Resolution rate of Terminal-Bench 4.0 tasks. The whiskers span the 95% confidence interval."

Terminal-Bench leaderboard (tbench.ai)

Published

Open the sourcetbench.ai

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