Anthropic
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
30.1
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 has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
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Sep 2025
Released
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
claude-sonnet-4.5 - SWE-Bench Verified
SWE-Bench Verified resolved rate 73.8
View sourceClaude-Sonnet-4 - LiveCodeBench
LiveCodeBench pass@1 59.4 across 1055 tasks
View source