Unreal Agent open-sources async harness: up to 40% cheaper than Codex
Unreal Labs open-sourced Unreal Agent, a Go harness that runs tool calls asynchronously so agents skip poll/wait token tax. On Terminal-Bench 4.0 with GPT-6 Astra xhigh it matched Codex at 57.9% for $1,428 vs Codex’s $2,350, and claims up to 40% cost savings vs Codex and 20% vs Pi on production workloads.