Or it's "normal" market segmentation. OpenRouter users are more price sensitive in general, also a lot of enterprise users who can't switch easily are using the official API (or Bedrock or Azure) and you want to squeeze them as much as you can.
A surprising amount of companies sell exact the same product through different channels for different prices. A good example is Apple.
Multiple times a year, retailers here in Australia have co-ordinated sales on Apple products. Apple.com or their retail stores don't have these sales.
But they're clearly Apple-funded when competing retailers launch the same sales on the same days; and the margins aren't enough for retailers to take a loss.
Seems reasonably clear to me? Potentially bringing in more customers who use OpenRouter for trying out all the models with rapid switching, enticing them to use Sol. And anyone being routed on price will immediately be switched to OpenAI's servers instead.
It also seems to be providing a vastly better user experience - Azure has less than 99% uptime (Azure USA only has 87% uptime), latency of 20 - 30 seconds, and a mere 8 tokens per second. OpenAI is offering 32 tokens per second (4x faster), 4 seconds latency (5x faster), and all for half the price of what Microsoft is charging for a vastly inferior experience.
I think being able to A/B test price is invaluable for them. They can't cut prices by 50% and hike it again. By letting others slash the price, they can tell if it is worth it or not to do this officially.
You're literally encouraging someone else to come in and steal your customer base,