Open-Source Unreal Agent Cuts SWE Marathon Costs 48% vs Codex+Sol 6.1

sull · x · 2026-10-07

Unreal Labs released Unreal Agent, an open-source agent harness claiming frontier cost efficiency on long-horizon tasks: 48% cheaper than Codex+Sol 6.1 xhigh on SWE Marathon at matching performance. New features include compaction, a TUI, and Anthropic model support.

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