@claudeai
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@claudeai Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. For most tasks, it performs at the level of Claude Fable 5.1, our most intelligent model. It writes more clearly and puts the most important information first, which makes it easier to work with over long sessions. It’s also faster and more efficient than Opus 5, so you can hand it your bigger, more ambitious work. On our most comprehensive alignment test, it’s the strongest performing model we’ve evaluated to date. We also worked with external evaluators, including Frontier Design and METR, to test it before release. Opus 5.5 is available today. To celebrate, we’re raising five-hour usage limits on Pro, Max, and Team plans, so there’s more room for you to explore what it can do. Read more at anthropic.com/claude-opus-5-5
