Model
Claude Sonnet 5.5.
Power
££
API cost
by Anthropic · released 28 September 2026
In plain English
Anthropic's middle tier, sitting between Opus and Haiku.
Good for
Everyday coding, research and professional work.
Things to be aware of
A sensible place to start with Claude. Only move up to a pricier model when you can show it does a better job.
What Anthropic says
““The best combination of speed and intelligence.””
- Context window
- 1.0M tokens
- Knows up to
- June 2026
- Run it yourself
- No, online only
- API price
- $2 in / $10 out
- per million tokens