Testing LFM2.5-2.6B: Enabling Reasoning Boosts Tool-Use Success by 26.7%
max_paperclips · x · 2026-08-07
A developer tested the LFM2.5-2.6B model on 30 tool-use tasks using a single RTX 5090. Results showed a significant gap: reasoning enabled achieved a 96.7% success rate, compared to 70.0% with reasoning disabled—a 26.7 percentage point difference.
Mechanically, disabling reasoning doesn't just make answers shorter and wronger; it removes the model's planning ability. Without a think block, average tool calls increased (4.16 vs 2.7) and bad calls rose (1.48 vs 0.97). Although reasoning roughly doubles token consumption (1403 vs 685 per task), it proves highly cost-effective for complex tasks.
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