Expired70% confidenceEventExact time
OpenAI quietly launched GPT 5.5 Instant, replacing GPT 5.3 Instant as ChatGPT's default model and making it available to all users.
4
Sources
70%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
AI Aggregator Platforms Tested: A Complete Guide to Using GPT 5.5 and Other Top Models for Free
bilibili郭默岩6/2/2026
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