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StocksUpdated•Originally published 5 May 2026•Updated 5 May 2026•

1 min read

OpenAI Launches GPT-5.5 Instant to Enhance ChatGPT Accuracy and Reduce Hallucinations

Key Facts

1OpenAI released GPT-5.5 Instant to replace GPT-5.3 Instant as the default model for ChatGPT.

2The new model aims to reduce hallucinations in sensitive areas like law, medicine, and finance while maintaining low latency.

OpenAI has officially released GPT-5.5 Instant, replacing GPT-5.3 Instant as the primary default model for the ChatGPT platform. This strategic update targets the reduction of AI hallucinations while introducing a significant collaboration with the U.S. government to test the model within a national security context. Executive Chris Lehane announced that OpenAI is providing early access to official authorities to ensure rigorous vetting of the system's capabilities. The new model is engineered to deliver higher factual accuracy without compromising the low-latency performance essential for professional applications. By involving government oversight, OpenAI aims to strengthen the reliability of its tools for sensitive enterprise and state tasks. This iteration reflects a broader industry trend toward aligning advanced AI development with national security and safety protocols.

29 days ago

Version History

Version 129 days ago

What changed: The story was updated to include details about OpenAI's collaboration with the U.S. government for national security testing and providing early access to official authorities.