Well, it is a Sonnet model, it is indeed better[0] than Sonnet 4.6 (smarter, faster, cheaper), but I don't see why would you use it as opposed to Opus 4.8 low or GLM-5.2...

[0]: https://aibenchy.com/compare/anthropic-claude-sonnet-4-6-med...

What's interesting, is that Sonnet 5 is actually worse[0] than 4.6 without reasoning.

It makes some sense, as models are trained more and more with reasoning, than without.

[0]: https://aibenchy.com/compare/anthropic-claude-sonnet-4-6-non...