Independent reproduction will determine whether supervised fine-tuning with Qwen3’s default chat template can suppress thinking mode while leaving training loss and basic evaluations apparently normal.
state: expiredheat: lowuncertainty: highnovelscott: lowqwen fine-tuning reasoning-modelsQwenMeldh LLC
What is this?
The case alleges that a Qwen3-8B supervised/LoRA fine-tuning run on non-thinking data lost its thinking behavior while ordinary training metrics and basic evaluations remained normal, reportedly involving Meldh LLC. The supplied web snippets establish that Qwen3-family thinking behavior is mediated partly through chat-template controls such as `enable_thinking`, with inconsistent support across models and runtimes. They do not independently document the reported fine-tuning experiment, identify Meldh LLC’s role, or establish that the default template can silently suppress thinking after training, so the central claim remains unverified.
Why it matters to Scott
No intersection was found in Scott’s wikis or existing radar pages. The unverified result may be relevant to reasoning-model fine-tuning practice, but the supplied material does not connect it to a position or active project of Scott’s.
queries asked of Scott's wikis
- fine-tuning silent capability regressions
- reasoning-model evaluation beyond training loss
- chat templates as model behavior control
- LoRA catastrophic forgetting reasoning
- independent reproduction of fine-tuning results
- thinking-mode evaluation harnesses
Measured heat
no measured readings yet — the hourly heat pass fills this in
How the heat travelled
no chain yet — the hourly chain pass fills this in
Evidence (2) — ⭐ canonical anchor
Interpretation history
2026-07-28T08:23:57Z
No independent reproduction or consequential follow-up appeared within the observation window; the claim remains a single-origin technical report rather than an emerging pattern.
2026-07-26T01:22:41Z
grounded: novel/low — No intersection was found in Scott’s wikis or existing radar pages. The unverified result may be relevant to reasoning-model fine-tuning practice, but the suppl
2026-07-26T01:22:29Z
origin walked (codex/luna, conf 0.97): anchor reddit.post.1v6p04v -> echo.blog.02625ce6ed by Maruf Bepary
2026-07-26T01:21:07Z
case created — A technically specific first-hand report identifies a consequential, testable fine-tuning failure mode, but it lacks independent reproduction.
Decision trace
- 07-28 18:23expireNo independent reproduction or consequential follow-up appeared within the observation window; the claim remains a single-origin technical report rather than an emerging pattern.
- 07-26 11:22groundNo intersection was found in Scott’s wikis or existing radar pages. The unverified result may be relevant to reasoning-model fine-tuning practice, but the supplied material does not connect it to a po
- 07-26 11:22promote_anchororigin walk conf 0.97
- 07-26 11:21createA technically specific first-hand report identifies a consequential, testable fine-tuning failure mode, but it lacks independent reproduction.