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Anthropic launched fast mode for Claude Opus 4.8 on May 28, 2026: the same model at 2.5x the output speed, three times cheaper than before. Opus 5.5 is now the fast mode default in Claude Code v2.1.280 and later, at $8/$40 per MTok; Opus 4.8 still supports it at $10/$50, billed to usage credits on subscription plans.
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