GPT 5.5: The System Card

Last week, Open AI announced GPT-5.5, including GPT-5.5-Pro. My overall read here is that GPT-5.5 is a solid improvement, and for many purposes GPT-5.5 is competitive with Claude Opus. Reactions are still coming in and it is early. My guess on the shape is that GPT-5.5 is the pick for ‘just the facts’ queries, web searches or straightforward well-specified requests, and Claude Opus 4.7 is the choice for more open ended or interpretive purposes. Coders can consider a hybrid approach. On the alignment and safety fronts, it is unlikely to pose new big risks, and its alignment seems similar to that of previous models. There is some small additional risk arising from its improved agentic abilities, including computer use. As always, when it is available, the system or model card is where we start. OpenAI does not drop the giant doorstops that Anthropic gives us with every release. After reading the Mythos and Opus 4.7 model cards, this strikes me as stingy. There’s still good info here, but overall it tells you relatively little about what is going on, and feels incurious and more pro forma. I would like to see a ‘yes and’ approach to what evaluations are run here, with cooperation between OpenAI and Anthropic (and ideally Google and others), where all labs run all the tests that any lab runs. This would give us a relatively robust set of tests, and also give us comparisons. I notice that if there were new alignment problems, or new dangerous capabilities, I am very not confident that the tests here would pick it up. This is all pretty thin. What I am relying on is the gestalt, including of how people are reacting, and in this case it seems far enough from the edge to be conclusive. GPT-5.5 was trained through the usual methods. There is a jailbreak bounty program: We have launched a public bug bounty program that will allow selected (via invitation and application) researchers to submit universal jailbreaks.​ Here is its self-portrait: Pro Versus Proxy As usual, GPT-5.5-