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OpenAI to deprecate GPT-4o variants by January 2027, GPT-6 Luna to replace

By PulseAugur Editorial · [1 sources] ·

OpenAI is deprecating GPT-4o and its variants, including GPT-4o mini, GPT-4.1, and GPT-4.1 mini, from its API on January 14, 2027. The replacement model will be GPT-6 Luna. Azure will retire similar versions on April 14, 2027, while ChatGPT removed GPT-4o in February 2026. Developers are advised to plan migrations carefully, as the new model handles tool calls and reasoning differently, necessitating thorough re-evaluation of applications even with identical prompts. A survey indicated that a significant percentage of companies experienced performance drops after model replacements, highlighting the importance of rigorous testing. AI

IMPACT Developers must plan for GPT-4o deprecation by January 2027, requiring re-evaluation and testing of applications with the new GPT-6 Luna model.

RANK_REASON This item discusses the deprecation and replacement of specific LLM versions, which is a product lifecycle event for developers using the API.

Read on dev.to — LLM tag →

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

OpenAI to deprecate GPT-4o variants by January 2027, GPT-6 Luna to replace

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46 / 100
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Tool
This item discusses the deprecation and replacement of specific LLM versions, which is a product lifecycle event for developers using the API.
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model release, product
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High
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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Tirth Gajjar ·

    GPT-4o deprecation: dates, replacement and how to migrate

    <p>GPT-4o leaves the OpenAI API on 14 January 2027. As of 22 October 2026, that date covers the listed GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini snapshots and the fine-tunes built on them, and OpenAI names <code>gpt-6-luna</code> as the replacement. Azure retires most of the …

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