The Information about GPT-4.5/5 and more: the tl;dr GPT-4.5 (“Orion”)
Originally developed as Orion and planned as GPT-5.
Performance disappointing: no major leaps forward compared to GPT-4o.
Reasons for failure:
Dwindling supply of high-quality web data for pretraining.
GPT-4.5 Orion Disappoints: Data Scarcity Limits Progress
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