The AWS pricing page says 10% more than OpenAI, which is probably because they’re forcing all inference through the US and data residency is at a 10% premium from the model vendors for whatever reason (because you’ll pay for it).
If they put in a global endpoint like with Claude (or OpenAI directly) then it’ll probably match the direct pricing, if the pattern holds.
(https://aws.amazon.com/bedrock/pricing/, scroll to OpenAI)
It’s even more expensive for GovCloud customers. We pay a 30% premium on top of that.
It also could be to provide room for enterprise discount pricing without it being money-losing for one of the companies.
I have worked at places that have negotiated flat percentage discounts on all AWS spend.
This explanation seems plausible to me.