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When OpenAI launched GPT-5 about two weeks ago, CEO Sam Altman promised it would be the company’s “smartest, fastest, most useful model yet.” Instead, the launch triggered one of the most contentious user revolts in the brief history of consumer AI.
Now, a simple blind testing tool created by an anonymous developer is revealing the complex reality behind the backlash—and challenging assumptions about how people actually experience artificial intelligence improvements.
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The web application, hosted at gptblindvoting.vercel.app, presents users with pairs of responses to identical prompts without revealing which came from GPT-5 (non-thinking) or its predecessor, GPT-4o. Users simply vote for their preferred response across multiple rounds, then receive a summary showing which model they actually favored.
