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ChatGPT defaults to "5.5 instant" model overriding user settings

Users of ChatGPT have observed that the platform sometimes defaults to the "5.5 instant" model even when a different model, such as "5.6 Sol," is set as the default in user settings. This behavior suggests that ChatGPT might be employing an internal model router that selects the "5.5 instant" model automatically, potentially overriding user preferences without explicit notification. This could occur when users do not manually select specific intelligence or thinking parameters before initiating a chat. AI

IMPACT Potential user confusion and loss of control over model selection in ChatGPT.

RANK_REASON User observation of unexpected model behavior in a widely used AI product.

Read on r/OpenAI →

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

ChatGPT defaults to "5.5 instant" model overriding user settings

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
User observation of unexpected model behavior in a widely used AI product.
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
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
63 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. r/OpenAI TIER_2 English(EN) · /u/FamilyNP ·

    Why is ChatGPT defaulting to “5.5 instant” even when 5.6 Sol is set as the default model in settings?

    <!-- SC_OFF --><div class="md"><p>When opening ChatGPT and starting a new quick chat, I have noticed if I scroll to the bottom and see what model was used to answer the question it will say 5.5 instant sometimes even though I have 5.6 Sol set by default on settings, why is it doi…