ChatGPT
86% accuracyHallucination risk: Moderateby OpenAI · Last updated June 2026
The most widely used general-purpose assistant.
Overview
ChatGPT, built by OpenAI, is the most widely adopted conversational AI in the world. It excels at general reasoning, writing, summarizing, and coding, and its newer models can browse the web and cite sources. For everyday questions it is fast and articulate — but fluency is not the same as accuracy, and ChatGPT will state incorrect information with the same confidence it states correct information.
Strengths
- Broad general knowledge and strong natural-language fluency
- Excellent at drafting, summarizing, and restructuring text
- Capable coding assistant across many languages
- Web browsing and source citation in newer models
Weaknesses
- Can confidently invent facts, statistics, and citations
- Knowledge can be outdated when browsing is off
- Tends to be agreeable, sometimes confirming a flawed premise
- Quality varies significantly between model versions
How accurate is it?
On well-established, widely-documented topics ChatGPT is accurate the large majority of the time. Accuracy drops on niche, fast-moving, or numerical topics — current prices, recent events, specific legal codes, dosages, and precise statistics are where errors cluster. Because the model optimizes for a helpful-sounding answer, mistakes are rarely flagged as uncertain.
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Hallucination profile
ChatGPT's most common failure mode is fabricating specifics: fake citations, invented court cases, made-up product features, and plausible-but-wrong numbers. The risk rises sharply when you ask for sources, exact figures, or details about obscure entities. Always treat any specific claim as a lead to verify rather than a fact.
Best use cases
- Brainstorming and first drafts
- Explaining concepts in plain language
- Code scaffolding and debugging help
- Summarizing text you provide
Verification tips
- Ask it to cite primary sources, then open and read them
- Cross-check any number, date, or quote against a second model
- Be skeptical when it agrees instantly with your assumption
- Verify anything medical, legal, or financial with a professional
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