model-update
1 article tagged with model-update
May 5, 2026
changelogOpenAI
OpenAI releases GPT-5.5 Instant as default ChatGPT model with 52.5% fewer hallucinations
OpenAI released GPT-5.5 Instant as the new default ChatGPT model on May 5, 2026. The company claims the update produces 52.5% fewer hallucinations on high-stakes prompts and 37.3% fewer inaccurate claims on challenging conversations compared to GPT-5.3 Instant.