Product change·Sep 21 → Sep 28, 2026·Week 40, 2026·AI & Machine Learning
Anthropic API: Opus 5.5 launches, replaces Opus 5 as flagship
Opus 5.5 ("Daily driver for agentic coding and enterprise work") launched at $4/MTok input, $20/MTok output (cache read $0.20, write $5.00), replacing Opus 5 as the flagship model; Opus 5 moved to Legacy Models at its original $5/$25 pricing.
What changed
Feature added
New flagship model Opus 5.5 ("Daily driver for agentic coding and enterprise work") launched at $4/MTok input, $20/MTok output, replacing Opus 5; Opus 5 moved to Legacy models at its original $5/$25 pricing.
Before and after
Sep 21, 2026 vs Sep 28, 2026Pulse.
100%
What changed
New flagship model Opus 5.5 ("Daily driver for agentic coding and enterprise work") launched at $4/MTok input, $20/MTok output, replacing Opus 5; Opus 5 moved to Legacy models at its original $5/$25 pricing.
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