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Anthropic to retire Claude Sonnet 4.5 model Nov 30, 2026

By PulseAugur Editorial · [1 sources] ·

Anthropic is retiring the claude-sonnet-4-5-20250929 model from its Claude API on November 30, 2026. Developers using this model are advised to migrate to the recommended replacement, claude-sonnet-5-5. The deprecation and retirement dates may vary across different platforms such as Amazon Bedrock and Google Vertex AI, requiring users to check each platform's specific lifecycle information. The article provides a step-by-step guide for developers to identify usage, test the new model, and implement a phased rollout before the shutdown deadline. AI

IMPACT Developers must update their integrations to avoid service disruptions when the claude-sonnet-4-5-20250929 model is retired.

RANK_REASON Article provides guidance on migrating from a deprecated model version.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic to retire Claude Sonnet 4.5 model Nov 30, 2026

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32 / 100
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Newsworthiness bucket
Tool
Article provides guidance on migrating from a deprecated model version.
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Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, infra
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High
Clearly on-topic for AI-industry coverage.
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Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · AI Deprecations ·

    What to Do Before Claude Sonnet 4.5 Shuts Down on November 30, 2026

    <p>Anthropic retires <code>claude-sonnet-4-5-20250929</code> on the Claude API on <strong>Nov 30, 2026</strong>. After that date, requests to it fail. Anthropic's recommended replacement is <code>claude-sonnet-5-5</code>.</p> <blockquote> <p>Free Mon/Wed/Fri email + breaking shut…

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