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Anthropic to retire Claude Sonnet 4.5 model by November 2026

By PulseAugur Editorial · [1 sources] ·

Anthropic is phasing out its Claude Sonnet 4.5 model, with all requests scheduled to fail after November 30, 2026. Developers using this model are advised to prepare for a migration to the newer Sonnet 5.5 version. The article provides a checklist to help identify and resolve issues that may arise during this transition. AI

IMPACT Developers using Claude Sonnet 4.5 will need to migrate to newer versions by November 2026 to avoid service disruptions.

RANK_REASON This is a product lifecycle announcement for an existing model, not a new release or significant industry event.

Read on Medium — Claude tag →

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

Anthropic to retire Claude Sonnet 4.5 model by November 2026

How we ranked this

Signal score
24 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
This is a product lifecycle announcement for an existing model, not a new release or significant industry event.
Source corroboration
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
model release
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. Medium — Claude tag TIER_1 English(EN) · Bitcot Insider ·

    Claude Sonnet 4.5 Retires Nov 30: A Migration Checklist for Apps in Production

    <div class="medium-feed-item"><p class="medium-feed-image"><a href="https://medium.com/@bitcot.insider/claude-sonnet-4-5-retires-nov-30-a-migration-checklist-for-apps-in-production-eba8bbadc9df?source=rss------claude-5"><img src="https://cdn-images-1.medium.com/max/1672/1*xPw38R8…

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