Claude Opus 5.5 (1M Context) Released as Default Opus Model with New Pricing

Core summary

One sentence to understand this update

Anthropic has released Claude Opus 5.5, which is now the default Opus model, featuring a 1M context window and new pricing at $4/$20 per Mtok with $0.20/Mtok cache reads.

Impact & opportunity

What this could mean

Builders can leverage Claude Opus 5.5's massive 1M context and new pricing structure to enhance the cost-effectiveness and performance of their AI applications.