MajorAnthropicNew Launch
Claude Opus 5.5 replaces Opus 5 with lower pricing and new API ID
Anthropic introduces Claude Opus 5.5 (claude-opus-5-5), replacing Opus 5. Pricing drops from $5/$25 to $4/$20 per MTok, default effort changes to medium, and knowledge cutoff moves to Jun 2026. Users on Opus 5 or earlier should migrate.
Sep 22, 2026 (UTC)Views:0
Impact Assessment
Cost3
Reliability1
Migration4
Quality4
Compliance0
Sources
docs
Anthropic Models Docs
Claude Opus 5.5
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