OpenAI's GPT 5.5 tops error-detection benchmark, beating previous AI proofreading records

OpenAI released GPT 5.5, which achieved the highest score ever recorded on Errata-Bench—a standardized test that measures how well AI systems catch grammar, style, and factual errors in written text.

The model catches more types of mistakes than prior versions: not just typos and grammar, but also inconsistencies (like a character's age changing mid-document) and unclear phrasing that confuses readers. This means writers using GPT 5.5 for editing get feedback on problems that simpler spell-check tools miss.

For students, journalists, and business writers who rely on AI editing tools, GPT 5.5 becomes a more reliable second pair of eyes—reducing the chance that embarrassing errors slip into final documents. For content teams at publishers and companies, it could reduce the number of manual proofreading passes needed before publication.