[mhmmmmmm]

They certainly do, and also offer the tooling to the public: https://docs.anthropic.com/en/docs/build-with-claude/prompt-...

They also recommend to use it to iterate on your own prompts when using Claude Code for example

[otabdeveloper4]

By "rigorous" I mean peeking under the curtain and actually quantifying the interactions between different system prompts and model weights.

"Chain of thought" and "reasoning" is marketing bullshit.

[int_19h]

How would you quantify it? The LM is still a black box, we don't know what most of those weights actually do.