OpenAI has released GPT-5.5 Instant as the new default model for ChatGPT. The update launched on May 5. This release follows the previous version GPT-5.3 Instant by two months. OpenAI positions GPT-5.5 Instant as a direct successor aimed at improving response quality.
The company reports significant reductions in hallucinations for high-risk prompts. Internal evaluations show a 52.5% decrease in false claims compared to GPT-5.3 Instant. The model also reduced user-flagged inaccuracies by 37.3% in difficult conversations. OpenAI claims the update improves accuracy in medical, legal, and financial domains.
OpenAI has restricted the use of unnecessary emojis in responses. The company emphasized this change to make outputs more concise. The update aims to reduce verbosity and remove unnecessary formatting while retaining core content. Paid users can continue using GPT-5.3 Instant for three months after the release.
GPT-5.5 Instant is available to all users globally starting today. OpenAI has not disclosed specific pricing tiers for this model update. The company did not provide detailed technical specifications for the underlying architecture. OpenAI has not confirmed the launch window for future model iterations.
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