OpenAI Updates GPT-5.5 Instant: Style & Quality
What is GPT-5.5 Instant?
GPT-5.5 Instant is OpenAI's low-latency, efficiency-optimized model that serves as the default for all ChatGPT prompts. OpenAI first released it on May 5, 2026, replacing GPT-5.3 Instant. Since then, the company has shipped two notable updates to fix real-world quality problems.
What changed in the May 5 release?
According to TechCrunch's coverage of the initial launch, GPT-5.5 Instant reduces hallucinations in sensitive areas like law, medicine, and finance. It also scored 81.2 on the AIME 2025 math test, compared to 65.4 for the older model. On the MMMU-Pro multimodal reasoning benchmark, it scored 76 versus 69.2 for its predecessor.
The release also introduced context management improvements. GPT-5.5 Instant can use a search tool to refer back to past conversations, files, and Gmail for more personalized answers. That feature launched for Plus and Pro users on the web, with broader rollout planned for Free, Go, Business, and Enterprise users.
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