A catalog of AI models in Microsoft Foundry that you can discover, compare, and deploy using Azure’s built‑in tools for evaluation, fine‑tuning, and inference
Thanks both. Resolved, and posting what actually worked in case it helps others.
The self-service form does accept an initial allocation from zero for Anthropic models, contrary to what I assumed when I asked. The form is Microsoft Foundry Service: Request for Quota Increase at https://aka.ms/oai/stuquotarequest and it is the right route even when the current quota is 0. Select Model Type Anthropic, then the hosting option, and the model list is filtered accordingly. Choosing Hosted on Azure lists the .Azure variants (claude-sonnet-5.Azure and so on), which is the bucket to target if you need in-region inference rather than inference on Anthropic infrastructure. The quota field is in capacity units where 1 unit is 1000 tokens per minute, so 450 means 450,000. No region is asked for on Global Standard, because that tier pools quota across all regions in the subscription.
I also opened an Azure support request first. That was unnecessary: the support engineer replied that quota approvals sit with a separate gating team and pointed me back to the same form. Worth skipping straight to the form.
One thing I could not confirm: whether pay-as-you-go is eligible for an initial Sonnet 5 allocation at all, which was my original question. The subscription already runs several Anthropic models including a newer one than Sonnet 5, so eligibility does not appear to be the blocker, but I will update this once the request is answered.