Claude Sonnet 4.5
active Active
Claude Sonnet 4.5 is an active Anthropic LLM API model. As of May 24, 2026 it has no announced deprecation or retirement date.
Lifecycle & specs
- Provider
- Anthropic
- API model ID
claude-sonnet-4-5-20250929- Status
- active
- Released
- Sep 29, 2025
- Context window
- 200,000 tokens
- Input price
- $3.00 / 1M tokens
- Output price
- $15.00 / 1M tokens
- Knowledge cutoff
- 2025-01-31
- Pricing checked
- May 22, 2026
Source: official Anthropic documentation ↗ · ✓ verified