Claude Opus 5.5 Released with 1M Context and New Pricing

Core summary

One sentence to understand this update

Anthropic has released Claude Opus 5.5 (claude-opus-5-5), which is now the default Opus model, featuring a 1M context window and updated pricing.

Impact & opportunity

What this could mean

Builders can leverage Claude Opus 5.5's expanded context window for more complex tasks and optimize costs with the new pricing structure.