Thumbnail showing large text reading “ULTIMATE GPT COMPARISON” on a black background, with the OpenAI logo glowing green near the top center and six rounded boxes below labeled 5.0, 5.1, 5.2, 5.3, 5.4, and 5.5 in different bright colors. On the right, a man in a black shirt poses thoughtfully with his hand on his chin, looking toward the text.
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The Ultimate ChatGPT 5 Model Comparison: GPT-5.0 vs 5.1 vs 5.2 vs 5.3 vs 5.4 vs 5.5

OpenAI dropped GPT-5.5 on April 23, 2026, and it is now the most capable ChatGPT model the company ships. GPT-5.5 scores 93.6% on GPQA Diamond, 82.7% on Terminal-Bench 2.0, and 78.7% on OSWorld-Verified, all ahead of GPT-5.4, while its Pro variant pushes BrowseComp to 90.1% and FrontierMath Tier 4 to 39.6%. In under nine months, OpenAI has shipped six distinct versions of GPT-5, each with its own identity and price point. If you have lost track of what separates GPT-5.0 from GPT-5.5, this guide covers every model in the family, release dates, context windows, benchmarks, pricing, and the key differences that actually matter. We also look ahead at what ChatGPT […]