Model releaseModerate global significanceConfirmed confidence
OpenAI releases GPT-4.5
OpenAI releases an improved GPT-4 model with stronger knowledge, generalization and safety performance.
What happened
Event details
OpenAI released GPT-4.5 on February 27, 2025 as an improvement over GPT-4. The entry records the parameter count as unknown, classifies the closed model as an autoregressive Transformer and cites the GPT-4.5 announcement as its primary source.
Assessment
Why it matters
A published model record with a documented capability or availability change.
62/100Global significance score. Regional effects are recorded only when the evidence supports a meaningful difference.
Availability
Access notes
Available through OpenAI's product and API access channels.