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Ollama bug misapplies Gemma 4 prompt templates

By PulseAugur Editorial · [1 sources] ·

Ollama version 0.35.1 exhibits a subtle bug where it incorrectly selects the prompt template for Gemma 4 models. The software defaults to a 'small' template when a 'large' template is intended, particularly affecting models derived from the base Gemma 4 12B model or when the model name lacks explicit size indicators. This discrepancy can lead to a missing 'thought block' in the model's output when 'thinking' is disabled, though the impact on generated answers is minimal. Users can manually specify the correct 'large' template in their Modelfile to ensure accurate rendering. AI

IMPACT This bug fix in Ollama ensures correct prompt template application for Gemma 4 models, potentially improving output consistency for users.

RANK_REASON The item describes a bug fix or behavior change in a specific version of a software tool.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Ollama bug misapplies Gemma 4 prompt templates

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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · The Homelab Postmortem ·

    Ollama picks the Gemma 4 prompt template from the model's name

    <p><strong>TL;DR</strong>: Gemma 4 models in Ollama carry <code>RENDERER gemma4</code>, which Ollama 0.35.1 resolves per request to <code>gemma4-small</code> (the e2b/e4b template) or <code>gemma4-large</code> (12b, 26b, 31b). It decides by looking for <code>e2b</code>/<code>e4b<…

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