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Here is definitive proof about <thinking_mode> and <reasoning_effort> tags existence. I got tired arguing with all the overconfident "it's just AI hallucinating because you asked this exact thing bro" idiots so went ahead and generated this from my company subscribed account.

Reddit · UpAndDownArrows · April 11, 2026
As you can see, not even hinting to Claude about "reasoning" or "thinking" or "effort" or anything like that. `--effort low` -> "<reasoning\_effort> set to 50" `--effort medium` -> "<reasoning\_effort> set to 85" `--effort high` -> "<reasoning\_effort> set to

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