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AnthropicCurrent

Claude Sonnet 4.5

Legacy model with balanced performance

Context Window

200K tokens

≈ 150K words

Input Price

$3

per 1M tokens

Output Price

$15

per 1M tokens

Released

September 2025

Capabilities

Vision / Image inputTool / Function calling

Best for

Balanced performance and speed for production applications

Strengths

  • Balanced performance
  • Coding
  • Reasoning
  • Writing
  • Agentic tasks

API identifier

claude-sonnet-4-5-20250929

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