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model-platforms

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OpenAI rolls GPT-5.5 Instant out as ChatGPT's new default model

OpenAIGPT-5.5 Instantmodel platformsmodel updatehigh impact
Key takeaway

OpenAI updated ChatGPT's default model to GPT-5.5 Instant and also exposed it in the API as `chat-latest`. The company says the release improves factuality, shortens responses, an…

Also covers
chatgptpersonalizationapi
Related entities
ChatGPTOpenAI APIGPT-5.3 Instant
/insights/2026-05-05-openai-rolls-gpt-5-5-instant-out-as-chatgpt-s-new-default-model
model-platformschatgptpersonalizationapi
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