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...
This model is still tracked for research and discovery, but it is excluded from default public rankings until it returns to active status.
21.3
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