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OpenAI retires o3 model from ChatGPT, replaced by GPT-5.6 Sol Instant

By PulseAugur Editorial · [1 sources] ·

OpenAI has retired the o3 model from ChatGPT, replacing it with the GPT-5.6 Sol Instant model. The author tested this new model alongside Claude-Fable-5 and Gemini-3.1-Pro using real-world judgment scenarios. Initial findings suggest that while the new GPT-5.6 model serves as a direct replacement in the ChatGPT interface, its performance and decision-making differ from the previous o3 model, and it also shows discrepancies with other leading AI models. AI

IMPACT This change impacts users relying on ChatGPT for judgment tasks, highlighting potential differences in performance and decision-making compared to the previous o3 model and other AI assistants.

RANK_REASON The article discusses the retirement of a specific model version within a product and its replacement, which is a product update rather than a new frontier model release.

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

OpenAI retires o3 model from ChatGPT, replaced by GPT-5.6 Sol Instant

How we ranked this

Signal score
0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The article discusses the retirement of a specific model version within a product and its replacement, which is a product update rather than a new frontier model release.
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, product
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
71 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [1]

  1. Towards AI TIER_1 English(EN) · Kairos Vance ·

    ChatGPT Retired o3. I Tested What Replaced It Against Claude and Gemini.

    <h4>Same two messy decisions. Four engines. The grades alone should bother you.</h4><figure><img alt="" src="https://cdn-images-1.medium.com/max/1024/1*RJ3Fu--nEPgLTmCJPl0svA.png" /><figcaption>The seat went empty. The grades did not agree.</figcaption></figure><p>I noticed o3 wa…

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