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Anthropic

Claude Sonnet 4.5

Previous-gen Sonnet. Still strong for most tasks at the same price as 4.6.

mid

Input price

$3/1M

Output price

$15/1M

Context window

200K

Max output

16K

Capabilities

textvisiontool-usecodereasoning

Benchmarks

MMLU-Pro84.5%
HumanEval93%
GPQA68.2%

Strengths

  • ✓Well-tested and stable
  • ✓Strong coding and analysis

Weaknesses

  • ✗Superseded by Sonnet 4.6
  • ✗Same price as the newer model

Compare with similar models

Claude Sonnet 4.5 vs Claude Sonnet 4.6Claude Sonnet 4.5 vs GPT-4oClaude Sonnet 4.5 vs Gemini 2.5 ProClaude Sonnet 4.5 vs GLM-4.7Claude Sonnet 4.5 vs Mistral Medium 3