Claude Sonnet 4.5

Text Generation
Anthropic · claude-sonnet-4-5-20250929
coding balanced

Best coding model in the world, 1M token context window (pricing increases above 200K tokens)

Context Window

1,000,000

tokens

Max Output

8,192

tokens

Input Pricing

$3.00

per million tokens

Output Pricing

$15.00

per million tokens

Core Capabilities

Vision Support
Function Calling
Streaming

Additional Capabilities

Coding

Best coding model in the world

Function Calling

Advanced tool use

Long Context

1M token context window for entire codebases

Vision

Image and document analysis

Benchmark Scores

Benchmark Score Ranking Date Scored Notes
LMSYS_Elo 1278.00 #3 October 01, 2025
SWE-bench_Verified 49.00 #2 October 01, 2025 Software engineering: real GitHub issues, full repository editing
TAU-bench_Retail 82.50 #1 October 01, 2025 Tool-use for e-commerce tasks
MMLU 86.90 - September 29, 2025
HumanEval 95.20 #1 September 29, 2025
Released: September 29, 2025