Claude Sonnet 4.5 (latest)
Anthropic · Balanced Claude model for coding, analysis, agent workflows, and cost control
Key facts
- Provider
- Anthropic
- Context window
- 1M tokens
- Max output
- 64K tokens
- Input price
- $3 / M tok
- Output price
- $15 / M tok
- Knowledge cutoff
- Jul 31, 2025
- Released
- Sep 29, 2025
- License
- —
Capabilities
ReasoningTool callingStructured outputFile attachmentsTemperature controlOpen weights
Reasoning options
- budget_tokens min 1024
Pricing
USD per million tokens, list API rates.
- Input
- $3
- Output
- $15
- Cache read
- $0.3
- Cache write
- $3.75
Modalities
- Input
- Text, Image, Pdf
- Output
- Text