LLMAPI only
Claude Sonnet 4.5
Anthropic
Updated May 22, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Superseded by Claude Sonnet 4.6
Specifications
- Type
- LLM
- Access
- API only
- Released
- September 29, 2025
- License
- Proprietary
- Context window
- 1,000,000 tokens
- Knowledge cutoff
- January 31, 2025
- Output speed
- 42 tok/s
- Latency (TTFT)
- 0.4s
- Input
- Text, Image
- Output
- Text
- API pricing
- $3.00 in · $15.00 out / 1M tokens
Capabilities
Function callingStructured outputWeb search
Benchmarks
Our take
Anthropic’s coding and agentic workhorse; topped SWE-bench Verified at launch and pushed sustained multi-hour autonomous coding.