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Anthropic to retire Claude Sonnet 4.5 model in November 2026

By PulseAugur Editorial · [1 sources] ·

Anthropic is retiring the Claude Sonnet 4.5 model on November 30, 2026, with requests to its model ID failing thereafter. Developers are advised to migrate to Claude Sonnet 5.5, checking application code, environment variables, and infrastructure configurations for instances of the older model ID. Tools like SunsetLint can automate the detection of these model IDs across repositories, supporting various providers including Anthropic, OpenAI, and Google Gemini. AI

IMPACT Developers need to update their code and infrastructure to avoid service disruptions when the Claude Sonnet 4.5 model is retired.

RANK_REASON The item discusses a tool for managing model retirements and provides information about a specific model's retirement date.

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 in November 2026

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Signal score
35 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The item discusses a tool for managing model retirements and provides information about a specific model's retirement date.
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
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High
Clearly on-topic for AI-industry coverage.
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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. dev.to — LLM tag TIER_1 English(EN) · Karthik Upadrasta ·

    Claude Sonnet 4.5 retires on 30 November: find it in your code

    <p>Anthropic retires Claude Sonnet 4.5 (<code>claude-sonnet-4-5-20250929</code>) on <strong>30 November 2026</strong>. After that, requests to that model ID on Anthropic's API fail. Anthropic recommends Claude Sonnet 5.5 as the replacement (<a href="https://platform.claude.com/do…

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