🤖OpenAI Ships GPT-5.5 Instant With Smarter Defaults and Lower Hallucinations
TL;DR
OpenAI released GPT-5.5 Instant on May 5 as the new default ChatGPT model, with reduced hallucinations, smarter routing on ambiguous questions, and finer-grained personalization controls. The release is the first major default-model swap since the GPT-5 launch.
OpenAI released GPT-5.5 Instant on May 5 as the new default ChatGPT model, with reduced hallucinations, smarter routing on ambiguous questions, and finer-grained personalization controls. The release is the first major default-model swap since the GPT-5 launch.
Key Points
GPT-5.5 Instant became the new default ChatGPT model on May 5
Lower hallucination rate vs GPT-5 across factual benchmarks
New personalization controls available in user settings
Why It Matters
Default-model swaps move the floor for hundreds of millions of users overnight. For builders, anything fine-tuned against GPT-5's behavioral quirks needs an immediate re-eval.
Quick Facts
Frequently Asked Questions
Why does this matter?
Default-model swaps move the floor for hundreds of millions of users overnight. For builders, anything fine-tuned against GPT-5's behavioral quirks needs an immediate re-eval.
What happened?
OpenAI released GPT-5.5 Instant on May 5 as the new default ChatGPT model, with reduced hallucinations, smarter routing on ambiguous questions, and finer-grained personalization controls. The release is the first major default-model swap since the GPT-5 launch.
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