Gemini-2.5-flash-preview-04-17 not honoring thinking_budget=0

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I have same issue

How To disable Thinking using Gemini 2.5 Flash? thinkingBudget: 0 not working

Hi, I read the doc I add thinkingBudget: 0 like this but still not working! it’s slow as if Thinking is not disabled when I tried OpenRouter version it’s faster , also when I tried Flash 2.0 it’s also faster than Flash 2.5 via Google AI Studio API with thinkingBudget: 0 did I do it wrong ? const requestBody = { contents: [{ parts: [ { text: preamble }, { text: prompt } ] }], generat…