Claude Sonnet 4.5

Anthropic

Our go-to model for sophisticated work that demands both intelligence and nuance. Sonnet 4.5 excels at complex coding projects, nuanced writing, detailed analysis, and thoughtful problem-solving. With thinking capabilities, multimodal support, and Claude's renowned ability to follow instructions precisely, this model strikes the perfect balance between capability and cost for professional-grade work. Ideal for when quality truly matters.

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Capabilities

Thinking

Tool Use

Image Input

PDF Input

Technical Specifications

Context Window

1,000,000 tokens

Max Output

64,000 tokens

Pricing

Token Costs (per 1M tokens)

Cache Miss Input

$3

Non-Reasoning Output

$15

Cache Read Input

$0.30

Cache Write Input

$3.75

Tool Costs (per 1K calls)

Web Search

$10

Code Execution

$0.0694

Legacy

Made legacy on

Reason

Outdated model

Recommended Replacement

Claude Sonnet 4.6