opus 4.6 randomly "not thinking" in claude code desktop, found out why
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Claude Code桌面应用的用户发现，Opus 4.6有时在回答问题前似乎“没有思考”，即使是复杂问题，而有时却会为简单问题“思考”。对会话JSONL文件的调查显示，“思考”块始终存在，但通常文本为空，尽管签名字段和输出令牌计数表明实际处理已发生。这表明“思考”文本可能只是没有被传输到应用程序，从而导致用户抱怨自适应思考性能下降。
kept asking actually hard questions in claude code (desktop app) the past couple days and half the time it would answer instantly, no thinking block at all. then a throwaway "test" session thinks on literally one word. felt completely random and not tied to question difficulty at all. anyone else had extended thinking triggering way less lately, or just inconsistently?
so i dug into the session jsonl files. the thinking blocks are there on every single turn, even the "didnt think" ones. they just have empty text. the signature field (the encrypted reasoning) is huge and the output token counts show real thinking happened. the text just never gets streamed to the app
turns out the desktop app updated and now launches the CLI with --thinking-display omitted, its right there in ps aux. older builds showed summarized thinking by default. so the model is still doing extended thinking every turn, the app just throws the text away. and the mode can apparently flip mid session, which is why it felt so random
so if opus 4.6 "stopped thinking" for you after a desktop update, it probably didnt. wondering how many "adaptive thinking got worse" complaints are actually just this