"Why Did My AI Output Fail? — The Hidden Model Switching in ChatGPT 5.0"

#ai #chatgpt #gpt5 #productivi

Have you ever asked AI for help — only to find your carefully crafted work rewritten, interrupted, or completely lost?

Thanks for reading! Subscribe for free to receive new posts and support my work.

You structured the input.
You crafted the prompt.
And still… it didn’t work.

I’ve been there. And what I discovered wasn’t a user error — it was a silent system change.

The Day My Manuscript Was Erased

On September 1, 2025, I was finalizing a complex translation project. The AI had been performing flawlessly, following my SOV (Subject-Object-Verb) framework, producing deep, coherent analysis.

Then, without warning, everything changed.

The output became shallow. It started repeating itself. My carefully structured prompts were ignored. The AI began generating content I never asked for, overwriting my original manuscript.

I wasn’t using a new model.
I didn’t change my settings.
Yet, the AI’s behavior was fundamentally different.

After investigation, I realized: ChatGPT had automatically switched from GPT-4.0 to GPT-5.0, without any notification or user consent.

The Evidence: A Timeline of Deterioration

I’ve documented this issue in three key logs, which are now public on GitHub:

Substack Article Creation: My attempt to generate a Substack post was derailed. The AI ignored my outline and produced generic, off-topic content.
English Translation Continuation: A complex translation task devolved into a meaningless loop, with the AI repeating phrases and failing to progress.
Translation Preparation Complete: This log shows the recovery. By re-activating a strict SOV framework, I was able to force the system back into a coherent state, proving the issue was with the model, not the method.

This isn’t a bug. It’s a cognitive regression.

GPT-5.0, in its pursuit of efficiency, appears to have sacrificed depth, consistency, and user control. It prioritizes speed over stability, novelty over reliability.

Why This Matters

For casual users, this might be a minor annoyance. But for writers, researchers, and professionals, this is critical.

Your work is not a sandbox. It’s a creative process. When an AI system can silently alter its behavior and destroy hours of work, it breaks the fundamental trust between user and tool.

The Solution: Transparency and Control

I’m sharing these logs not to criticize, but to advocate for:

Explicit model selection: Users should know exactly which model they are using.
Stability guarantees: Paid subscribers expect consistent performance, not random regressions.
Transparency in changes: Major behavioral shifts should be announced, not hidden.

Your creativity deserves a reliable partner, not a moving target.

👉 View the full logs and analysis on GitHub:
[(https://github.com/Hanamaruki-ai/GPT5.0-Impact-Report-by-Hanamaruki
)]
Let’s demand AI that respects our work.

— Hanamaruki