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Qwen4-Max-Preview returned an empty reply at max_tokens 300: here's why

This story is from 2026-11-11. It is preserved in the archive; the latest stories are on the live feed.

A 300-token max_tokens used to be a safe cap for a short answer. On Qwen4-Max-Preview it returned HTTP 200 with an empty content . Alibaba changed what max_tokens covers: on this model it limits the thinking and the answer together, so the reasoning can use up the budget before the answer starts. T…

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Timeline · 2 reports

  1. 2026-11-12 01:38 · DEV Community — AI
    Alibaba Launches Qwen4-Max Preview, Opening Its Next-Gen Model Family
  2. 2026-11-11 14:23 · DEV Community — AI
    Qwen4-Max-Preview returned an empty reply at max_tokens 300: here's why

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