We have like a dozen different LLM tools available to us and it's as easy as clicking on a dropdown to switch in every single one of them, and we have several thousand employees. Self-hosting with the cheaper OSS models is also becoming more and more attractive for larger orgs.
That's just inference. Claude.ai is a platform that enterprise IT teams connect up to all kinds of other applications, and gets use beyond the claude code CLI. Non-developers get used to this functionality - whether it's their form-building stuff, artifacts, slides/presentations, etc... they're building an offering far beyond just inference. I agree the latter is a commodity now, though companies will compete on privacy options (ZDR, guaranteed confidentiality, etc)
Many large enterprises don't use Claude.ai. All their traffic goes through an internal gateway that routes to Bedrock. In addition, there is a whole ecosystem of LLM related infrastructure/tools deployed by "enterprise IT teams" where Anthropic barely has any presence.
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Similar at my $(dayjob) and can confirm.