Publications & Commentary
Papers & Reports Newsletter Podcast
Data & Resources
Datasets
Overview AI Benchmarking AI Models Frontier Data Centers ML Hardware AI Companies GPU Clusters
Resources
AI Trends & Statistics Data Insights
Projects
FrontierMath GATE Playground Distributed Training Model Counts
About
About Us Our Team Careers Consultations Our Funding Donate
Latest
Contact
Dashboard Benchmarks Models ECI Data About

Claude Sonnet 4.5 (32k thinking)

Anthropic’s latest mid-size model, part of the Claude 4.5 series, evaluated with up to 32,000 reasoning tokens.

Release date
2025-09-29
Developer
Anthropic
Accessibility
Non-open weights
143
Epoch Capabilities Index
RANK:
ECI is a composite metric based on over 42 benchmarks. Learn more.
Thank you for your feedback!

Your comment will be reviewed. We may not be able to respond to every submission.