AI model · Anthropic
Claude Sonnet 4.5
Model ID: anthropic/claude-sonnet-4.5
- Input
- $3 per 1M tokens
- Output
- $15 per 1M tokens
- Context
- 1M tokens at once
- Max output
- 64K tokens per reply
- Released
- 29 Sep 2025 Anthropic
What it can do
- YesReasoning
- YesTool calling
- YesImage input
- NoOpen weights
- NoFree to use
Takes text, image, file; gives text.
How its listing describes it
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...
Sources
- Anthropic: Claude Sonnet 4.5 on OpenRouter — read 2 Oct 2026