Does my CSP partner get visibility into opportunities to save on my Azure spend?

Yes — because your CSP partner has access to your usage and billing data (to the extent you've granted), a good partner can proactively flag cost optimization opportunities like underutilized resources, reservation candidates, or oversized VMs, rather than you having to find them yourself.

Not every partner does this proactively by default, so it's worth asking specifically whether cost optimization review is part of what they offer, or something you'd need to request.