ReviewsComparison
Claude Opus 5.5 vs Sonnet 5.5: $4 vs $2, and what else differs
Anthropic's specs show the two models match on context, output and cutoff. Opus costs twice as much and is slower, and Sonnet cannot turn thinking off.
Claude Opus
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AppsExplainer
Is Claude Opus 5.5 free? No, it needs Pro or the API
Anthropic's pricing page shows Opus as unavailable on the Free plan. Pro costs $20 a month, and the API charges $4 per million input tokens.