Claude Sonnet 4.5
MultimodalClaude Sonnet 4.5 is the world's best coding model. It is the strongest model for building complex agents. It is the best model for computer use. And it shows substantial improvements in reasoning and math. Top-tier intelligence on most tasks with exceptional agentic and coding capabilities.
Key Specifications
Parameters
-
Context
200.0K
Release Date
September 29, 2025
Average Score
75.8%
Timeline
Key dates in the model's history
Last Update
July 19, 2025
Announcement
September 29, 2025
Today
March 26, 2026
Technical Specifications
Parameters
-
Training Tokens
-
Knowledge Cutoff
January 31, 2025
Family
-
Capabilities
MultimodalZeroEval
Pricing & Availability
Input (per 1M tokens)
$3.00
Output (per 1M tokens)
$15.00
Max Input Tokens
200.0K
Max Output Tokens
64.0K
Supported Features
Function CallingStructured OutputCode ExecutionWeb SearchBatch InferenceFine-tuning
Benchmark Results
Model performance metrics across various tests and benchmarks
Reasoning
Logical reasoning and analysis
GPQA
Graduate-level reasoning • Self-reported
Other Tests
Specialized benchmarks
SWE-bench Verified (Agentic Coding)
Agentic coding • Self-reported
Terminal-Bench
Agentic terminal coding • Self-reported
OSWorld
Computer use • Self-reported
AIME 2025
High school math competition • Self-reported
MMMLU
Multilingual Q&A • Self-reported
TAU-bench Retail
Agentic tool use • Self-reported
TAU-bench Airline
Agentic tool use • Self-reported
MMMUval
Visual reasoning • Self-reported
License & Metadata
License
proprietary
Announcement Date
September 29, 2025
Last Updated
July 19, 2025
Articles about Claude Sonnet 4.5
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