Afaik LLMs still can't add numbers. They've just had their system prompts updated to make them use a tool call for any arithmetic.

That does not reflect with testing I just did locally. When the option of writing and running scripts was available, Qwen3.8-flash did indeed prefer to just do a physics related calculation via code. But, with a fresh chat and tool access turned off, it did the work on its own and produced correct results. Each step was rounded similar to how a person working by hand might do things, but matched my own hand calculations perfectly.