OpenAI makes GPT-5.5 Instant the ChatGPT default, claiming halved hallucinations
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OpenAI makes GPT-5.5 Instant the ChatGPT default, claiming halved hallucinations

OpenAI has released [GPT-5.5 Instant](https://openai.com/index/gpt-5-5-instant/) as the new default model in ChatGPT, replacing GPT-5.3 Instant. The headline claim targets the failure mode professionals care about most: 52.5 per cent fewer hallucinated claims than its predecessor on high-stakes prompts spanning medicine, law and finance, by OpenAI's own evaluation. Benchmark movement is substantial, with AIME 2025 at 81.2 against 65.4 for GPT-5.3, and MMMU-Pro at 76, [as reported by TechCrunch](https://techcrunch.com/2026/05/05/openai-releases-gpt-5-5-instant-a-new-default-model-for-chatgpt/). The personalisation layer is the bigger workplace story: the model can search past conversations, uploaded files and connected Gmail, with visible "memory sources" users can inspect, correct or delete. Rollout starts with Plus and Pro on the web, with Free, Business and enterprise tiers following over coming weeks. In the API it ships as "chat-latest", and GPT-5.3 retires from the paid API within three months. The governance note: a default-model swap means every staff ChatGPT session changed behaviour overnight. Check what connected accounts expose before banking the accuracy gain.

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