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Dashboard Benchmarks Models ECI Data About

Claude Sonnet 4.5 (no thinking)

Anthropic’s latest mid-size model, part of the Claude 4.5 series.

Release date
2025-09-29
Developer
Anthropic
Accessibility
Non-open weights
138
Epoch Capabilities Index
RANK:
ECI is a composite metric based on over 42 benchmarks. Learn more.
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