Oh, well in that case, if posting URLs counts as proof of… something, there doesn’t appear to be any SLA page anywhere in their sitemap. https://www.anthropic.com/sitemap.xml
Maybe it is just common for enterprise SaaS businesses to offer SLAs without having a page about it though. Something like that could possibly be unjustifiably burdensome as well because it’s not like they could just type “make a page about how we offer SLAs” and have it magically appear
Not everything a business might be willing to do is listed on their public website.