Claude Sonnet 4.5
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 improvements across system design, code security, and specification adherence.
Input
Output
Context
1000K
Max Output
64K
Parameters
—
Technical Specifications
Model TypeChat
Context Window1.0M
Max Output Tokens64K
Parameters—
Training Cutoff2025-07-01
Licenseproprietary
Capabilities
Input Modalities
textimagefile
Output Modalities
text
Features
agenticcomputer_useextended_thinkingfunction_callingjson_modememorypdf_readingreasoningstreamingsystem_promptstext_generationtool_usevision
Benchmarks
#52
Rank (Text)
+5/-5
arena text ci 95
1338
Arena Score (Text)
22,629
Votes (Text)
#28
Rank (Vision)
+12/-12
arena vision ci 95
1212
Arena Score (Vision)
2,448
Votes (Vision)
Resources & Links
proprietary — Proprietary - API access only
Related Tools
Data sourced from official provider APIs and documentation
Last updated: May 5, 2026
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