🪦 Dead

Claude Sonnet 4 & Opus 4

Model deprecation · Model Deprecation · shut down June 15, 2026

Born
Died
Lifespan
11m 25d
Cause of death
Model Deprecation
Killed by
Anthropic
Type
Model

Anthropic's flagship Claude 4 generation — Sonnet 4 and Opus 4 — retired less than a year after launch. API calls to claude-sonnet-4-0 and claude-opus-4-0 return errors after June 15, 2026. Replaced by the 4.5 and 4.7 series with dramatically improved coding and computer use capabilities.

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Questions about Claude Sonnet 4 & Opus 4

Is Claude Sonnet 4 & Opus 4 dead?

Yes. Claude Sonnet 4 & Opus 4 was shut down on June 15, 2026, 11m 25d after its launch on June 25, 2025. The cause of death was model deprecation; it was killed by Anthropic. Classification: model deprecation. Details and the source are above.

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