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Canonical AI event

Claude Sonnet 4.5 deprecated in v1.78.0

The API now includes a list spend limits endpoint. Claude Sonnet 4.5 will be deprecated by November 30, 2026.

1 Oct 20261 verified claims1 sources1 observations
What happened

The official source reports this update: v1.78.0. 1.78.0 (2026-09-30) Full Changelog: v1.77.0...v1.78.0 Features api: add list spend limits endpoint ( 597ed95 ) Chores api: mark Claude Sonnet 4.5 as deprecated (end-of-life November 30, 2026) ( 5464a3e )

Why it matters

This official update documents a development concerning v1.78.0. Its practical significance depends on the scope and evidence stated by the source.

What to watch next

Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge

Entities affected by this event

Anthropic Sdk Gosubject
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Evidence trail

Sources behind the event

Anthropic Go SDK official releasesv1.78.0
Editorial presentation

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