Laguna S 2.1 thinking bug may be a chat-template issue, not the model
Shoddy_Bed3240 · reddit · 2026-07-23
Poolside’s Laguna S 2.1 appears to have had a thinking-mode bug tied to its chat template.
- The poster says the Poolside team updated the chat template twice in the last 24 hours.
- A bug where preservethinking was disabled could prevent reasoning from starting at all.
- They point to Qwen 3.6 27B’s chat template as a working reference: when used with --chat-template-file in llama.cpp, it enables reasoning correctly for Laguna S 2.1.
- The linked discussion and template files suggest the issue may be in template wiring rather than the model itself.
Related event: Laguna-S-2.1's Reasoning Anomalies Linked to Quantization and Templates(3 posts)→
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