Claude Opus 5.5
The gist
Anthropic released Claude Opus 5.5 on Sep 22, 2026, priced 20% below Opus 5.
It matters because Anthropic says it matches its top model for less.
How it unfolded
- Sep 22, 2026Anthropic releases Claude Opus 5.5, calling it its most powerful AI model to date and the first in the Claude 5.5 family.
- Sep 22, 2026Anthropic says Opus 5.5 performs at the level of Claude Fable 5.1 on most work, costs 40% less to run than Opus 5, and generates output more than 30% faster.
- Sep 22, 2026Pricing is set at $4 per million input tokens and $20 per million output tokens, 20% below Opus 5, with cache reads at $0.20 per million tokens, 60% less than Opus 5.