Llama-cpp update skips Gemma model reasoning phase

A user on r/LocalLLaMA encountered an issue where the reasoning phase of the Gemma4 31b model was being skipped in recent builds of llama-cpp. This functionality had previously worked, but a recent update related to the Gemma 4 12b unified model seemed to cause the problem. The user discovered that a new "thinking" dropdown, disabled by default in the chat interface, was the cause, and enabling it resolved the issue. AI

IMPACT Troubleshooting tip for users of llama-cpp and Gemma models.

RANK_REASON User troubleshooting a specific software issue with a popular open-source tool.

Read on r/LocalLLaMA →

• Gemma 4 12b
• Gemma4 31b
• llama-cpp
• r/LocalLLaMA

• product
• other

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