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SpecEvo: Speculative Evolution with Large Language Models for Cost-Efficient Scientific Discovery

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Briefings

SpecEvo is a multi-LLM framework that coordinates lightweight models for cost-efficient scientific discovery. It uses lightweight models for parallel exploration and an Advisor for consolidation, with a frontier-model Navigator intervening at sparse checkpoints. Across 176 tasks in four domains, SpecEvo matches or outperforms frontier baselines while reducing API costs by up to 80% and improving evaluation efficiency by up to 1.5x.

Key points

• SpecEvo uses a multi-LLM framework with lightweight models for parallel exploration and an Advisor for consolidation.
• A frontier-model Navigator intervenes at sparse checkpoints to refine the population through synthesis or reframing.

Context

This research addresses the high cost and slowness of existing LLM-driven evolutionary search methods by introducing Speculative Evolution. The framework's effectiveness is demonstrated across 176 tasks spanning four scientific and algorithmic discovery domains.

Limitations

Results are based on 176 tasks across four domains; specific performance metrics vary by task type and baseline comparison.

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