Sorry, this isn't sarcasm or anything like it. I just don't get it and your answer does not help.
There are a host of different hypothesis you could pose to explain that. Maybe OpenAI has some secret sauce they'll share with AMD now that they have a stake. Maybe OpenAI will be more likely to buy from AMD in the future. Maybe AMD can use the experience they get serving OpenAI to better their products. Heck, maybe OpenAI will pump the stock by having Sam Altman talk about it on some podcasts.
It's impossible to disentangle all of those theories, because different investors will have different beliefs and you only get an aggregate.
Imho AMD itself needs to have a theory, which underpins their signing of the deal. For my clueless self, that investors have various theories and we don't know what they are is ok-ish, but that AMD has a theory but keeps it secret yet it gets the result of stock rise... is fishy.
Everyone is going in circles making suppositions and estimations based on who knows what. That can't be healty, can it? There used to be requirements that publicly listed companies act with some level of transparency, and those requirements existed for a reason. I guess. I am certainly no expert in finance.
It's not secret at all. Companies announcing a deal like this usually include some PR material alongside it [1]. In this one, the quote is:
“Our partnership with OpenAI is expected to deliver tens of billions of dollars in revenue for AMD while accelerating OpenAI’s AI infrastructure buildout,” said Jean Hu, EVP, CFO and treasurer, AMD. “This agreement creates significant strategic alignment and shareholder value for both AMD and OpenAI and is expected to be highly accretive to AMD's non-GAAP earnings-per-share.”
[1]: https://www.amd.com/en/newsroom/press-releases/2025-10-6-amd...
This would be where AMD is to gain new money.
OpenAI also has to gain, if it means access to more GPUs allows it to compete and be the winner of the LLM race. As the winner of the race, it would make new money, but also likely need to spend even more money on AMD to buy even more GPUs for years to come.
The issue here is now, that every large customer of AMD will now probably ask for equity. AMD has put itself into a pit hole with that deal.
If I were Hyperscaler CEO, I would basically ask for the a similiar deal as OpenAI or no business. Sorry Lisa Su but as a CEO giving equity to a customer is an absolute red flag because it starts a negative spirale you can't stop.
It seems that no matter the discount, OpenAI wasn't ready to make deal without equity. This tells you exactly how AMD is seen in the AI world.
OpenAI will take the compute for free and help AMD to rise stock value but it won't help AMD one bit because if AMD remains in the current position then OpenAI and Hyperscalers can get great deals with equity from AMD. The incentive isn't now to improve AMD to be competitive but to squeeze everything out of a company being desperate enough to give equity to customers.
And AMD will feel this. Nvidia will remain dominant because of ecosystem and supply. AMD can't easily replace Nvidia in supply chain and Nvidia is already strongly entrenched in many AI compute operations. And on the other side Hyperscalers are focused on their own chips (even OpenAI LOL) so they will tell AMD "Give us equity or no deal". This deal might be really the worst AMD deal yet because AMD is telling the world "here, you can get free AI compute from us financed by our equity". And while it might push AMD share price the very share price will drop 80-90% like any other one in case of an AI bubble pop.
Predicting the end of bubbles is well known to be a fool's errand, but if this AI bubble is still going in a year I can only imagine how casually these companies will have to be throwing around multi-trillion dollar promises to each other to keep the stocks pumped up.
That reminds me a lot of Enron. As long as the stock keeps going up everything is fine but when it does t everything comes crashing down.