Yeah, it does. It was possible with 2.5 Flash.

Here's a similar result with Qwen Qwen3.5-397B-A17B: https://chat.qwen.ai/s/530becb7-e16b-41ee-8621-af83994599ce?...

Ok it prints some stuff at the end but does it actually count the output tokens? That part was already built in somehow? Is it just retrying until it has enough space to add the footer?