Anthropic makes Claude Opus 5.5 the default on paid plans

Anthropic has made Claude Opus 5.5 the default model in Claude on Pro, Max, Ultra and Team plans, and recommends it as the everyday model for research, analysis and finished documents, decks and spreadsheets. Anthropic says Opus 5.5 at Medium effort matched or beat Opus 5 at High effort on its coding and knowledge-work evaluations, and that in an internal merger-analysis test it finished in 63 minutes at half the cost of Opus 5 on the same task. The company also lists prompting changes for the new model: drop "think hard" instructions, start at Medium effort, and attach charts instead of retyping their values. On these plans, higher-priced models consume usage limits faster. Fable 5.2 is not included in the limits of Pro plans or standard seats on Team and seat-based Enterprise plans outside limited-time launch offers, so it runs on usage credits.

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