Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
anthropic/claude-sonnet-4.5Claude Sonnet 4.5 is an API model from Anthropic, released on Sep 29, 2025, with a context window of 1,000,000 tokens, pricing of $3 per million input tokens and $15 per million output tokens. It accepts file, image, text input and produces text output.
At listed prices, a request with 10,000 input tokens and 1,000 output tokens costs about $0.045.
Specs are sourced from OpenRouter and were last checked on Nov 3, 2026. Always confirm current pricing and limits with the provider before production use.
Claude Sonnet 4.5 supports a context window of 1,000,000 tokens.
Claude Sonnet 4.5 is listed at $3 per million input tokens and $15 per million output tokens on OpenRouter.
Claude Sonnet 4.5 was published on Sep 29, 2025.
Claude Sonnet 4.5 accepts file, image, text input and produces text output.