Long Live Fine-Tuning: Task-Specific Transformers Outperform Zero-Shot LLMs for Misinformation Response Classification on Reddit

In three linesFine-tuned RoBERTa outperforms zero-shot LLMs (Claude Haiku, Gemini Flash) on Reddit misinformation response classification: 0.62 macro-F1 vs 0.50. Model scaling (Llama-3-70B vs 8B) provides no benefit. Safety alignment in commercial models degrades belief detection (0.17 for Claude Sonnet).

Summary generated by Claude — human-verified