Expired50% confidenceFactExact time
In OpenAI's model naming system, minor version numbers (such as 5.3 to 5.5) typically represent fine-tuning optimizations on the same architecture, including RLHF strategy adjustments, inference efficiency improvements, or output style calibration.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
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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