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Google to retire Gemini 2.5 Pro and Flash models Dec 1, 2026

By PulseAugur Editorial · [1 sources] ·

Google is retiring Gemini 2.5 Pro and Gemini 2.5 Flash on December 1, 2026, automatically routing requests to newer models. Users calling Gemini 2.5 Pro will be switched to Gemini 3.8 Flash, while Gemini 2.5 Flash users will be moved to Gemini 3.5 Flash-Lite. This transition involves changes in pricing, sampling parameters, and model behavior, requiring developers to update their code and test thoroughly to ensure compatibility and maintain desired output quality. AI

IMPACT Developers using Gemini 2.5 Pro and Flash must update their code to adapt to new models, pricing, and parameter changes before December 1, 2026.

RANK_REASON This item discusses the deprecation and automatic rerouting of existing AI models, not a new release.

Read on dev.to — LLM tag →

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

Google to retire Gemini 2.5 Pro and Flash models Dec 1, 2026

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57 / 100
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Tool
This item discusses the deprecation and automatic rerouting of existing AI models, not a new release.
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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.
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model release, product
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High
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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 Gemini 2.5 Pro and 2.5 Flash Are Retired on December 1, 2026

    <p><strong>Shutdown: Tuesday, Dec 1, 2026.</strong> Google's Gemini API retires <code>gemini-2.5-pro</code> and <code>gemini-2.5-flash</code>. From that date, requests to <code>gemini-2.5-pro</code> are automatically routed to <code>gemini-3.8-flash</code> and requests to <code>g…

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