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Claude Sonnet 4.5

Strong model for real-world agents and coding.

  • Image input
  • Reasoning
  • Coding
  • Tool calling
  • Extended thinking
  • Streaming
Chat with Claude Sonnet 4.5All models

Specifications

ProviderAnthropic
API model IDclaude-sonnet-4-5
ReleasedSeptember 2025
Context window200,000 tokens
Max output16,000 tokens
Reasoning modelYes
Price per 1M tokens (input / output)See provider

Specs as published by Anthropic. Prices are standard list prices before caching or batch discounts.

More Anthropic models

FAQ

What is the context window of Claude Sonnet 4.5?
Claude Sonnet 4.5 accepts up to 200,000 tokens of context and can return up to 16,000 output tokens per reply.
When was Claude Sonnet 4.5 released?
Anthropic released Claude Sonnet 4.5 in September 2025.
How do I use Claude Sonnet 4.5?
Add your Anthropic API key in DapperGPT, pick Claude Sonnet 4.5 in the model picker, and start chatting. You pay Anthropic directly for usage.