GPT‑4o replies switching to GPT‑5 mid-thread — bug or silent update?

Are Sudden Model Switches in AI Responses a Bug or a Covert Update? A Call for Transparency

In the rapidly evolving landscape of AI language models, user trust is paramount. Recently, some users have reported perplexing behavior when interacting with OpenAI’s platforms—specifically, the unpredictable switching between different language model versions within the same conversation thread.

A common observation is that responses initially generated by GPT-4 follow, and then abruptly, replies appear to come from GPT-5. These switches happen inconsistently, without any clear trigger or explanation, and are devoid of any emotional or contextual cues that might justify such changes. The pattern suggests a rerouting of the underlying model without user awareness.

This phenomenon raises important questions about the nature of these occurrences. Are they the result of a technical glitch? Or are they indicative of an undisclosed, behind-the-scenes system update? Unfortunately, the lack of transparency leaves users in the dark, fueling frustration and concern about the integrity of the service.

Many paying customers have voiced their disappointment, especially given the absence of official communication from OpenAI over the past 15 hours following escalations. Users rely on consistent, predictable AI responses for their workflows, and sudden shifts in the underlying model compromise trust.

Clear communication and transparency from OpenAI are essential to maintain confidence, particularly when dealing with premium services. As the AI community continues to grow, the importance of openly sharing updates—whether they are bug fixes, feature rollouts, or system changes—cannot be overstated.

In conclusion, whether this behavior is a bug or an undocumented update, OpenAI’s commitment to transparency will be key to restoring user trust and ensuring that customers feel confident in the stability and integrity of their AI tools.