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Free the models: Harness design at the frontier

ReplitOfficial

Why Free the models: Harness design at the frontier matters

Teams building multi-agent coding systems can adopt this pattern of agent-directed delegation to reduce harness overhead and improve cost-performance tradeoffs, particularly as frontier models improve at long-horizon planning and learn to self-route without scaffolding.

Summary

Replit Agent introduces a new agentic architecture where a core LLM dynamically selects which subagents to delegate to and adjusts effort allocation in real time, rather than using a fixed router model to make routing decisions. The approach achieves Pareto efficiency gains over baseline Astra and sidekick architectures on coding benchmarks (DeepSWE, Terminal-Bench) by letting frontier models decide their own resource allocation across tasks.

Read the full article at Replit

CoFabrix summarises and comments on this story. The original reporting belongs to Replit.

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