OpenAI’s ChatGPT 5 delivers PhD-level reasoning, advanced coding, and fewer errors than ever before — but a simple decimal subtraction slip on launch day shows it’s still not perfect. Here’s why the mistake happened, what “reasoning slips” mean, and how to get the most accurate results from this powerful AI.
ChatGPT 5’s Promise and Reality
OpenAI CEO Sam Altman described ChatGPT 5 as “like talking to an expert on any topic.” The company calls it its most advanced AI yet, with PhD-level reasoning, improved coding, and fewer errors. But on launch day, it still made a basic decimal subtraction mistake — showing that even experts, human or artificial, can slip.
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The Small Math Error
The question was: 5.9 = x + 5.11
The correct answer: x = 0.79
However, GPT-5 initially replied x = -0.21, and only gave the correct answer after being asked again. This wasn’t due to a lack of math skills, but rather what AI engineers call a “reasoning slip” — a small misstep in mental calculation.
Why the Mistake Happened
AI models don’t “see” numbers the way humans do. They generate answers based on data patterns. In this case, GPT-5 appears to have mentally reversed the subtraction order. When prompted to solve step-by-step, it produced the correct result. This shows that giving clear, step-by-step instructions can greatly improve accuracy in AI answers.
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New Capabilities in GPT-5
GPT-5 replaces GPT-4 and the o-series, handling complex questions, research, and tool usage automatically. In “thinking mode,” it becomes even more accurate. Altman compared the leap from GPT-4 to GPT-5 to Apple’s shift to Retina Display. It’s also stronger than ever at coding, capable of building websites, apps, and games in a single prompt.
Fewer Errors, But Not Perfect
OpenAI claims GPT-5 is 45% less likely to make factual errors than GPT-4o, and 80% more accurate in “thinking mode.” Still, small mistakes can happen, especially when AI calculates without explicit steps. That’s why asking it to “show its working” can be the difference between a quick answer and a correct one.
Availability and Pricing
ChatGPT 5 is available in three versions:
- Mini – Lightweight, used when limits are reached
- Regular – Default mode for most users
- Pro – $200/month, fastest and most powerful
All signed-in ChatGPT users now default to GPT-5, with automatic “thinking mode” activation for harder problems.
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The Takeaway: A Learning Moment
GPT-5 is highly skilled in mathematics, calculus, and statistics. But this decimal slip proves that AI accuracy also depends on how the question is framed. For everyday use, GPT-5 is a huge leap forward — more accurate, more capable, and far better at following instructions. Yet, for the best results, it’s always worth asking it to show its process.
Conclusion: ChatGPT 5
ChatGPT 5 is a remarkable leap in AI technology — faster, smarter, and more capable across subjects than any of its predecessors. Yet, its decimal slip reminds us that even the most advanced AI can make small mistakes without clear instructions. For the most reliable results, treat it like a human expert: ask it to explain its steps and show its working.
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