Unreal Agent: async harness cuts agent costs by 40% on GPT-6 Astra

Unreal Agent

Unreal Labs open-sourced an agent harness that makes tool calls fully asynchronous: the model issues a call and moves on while the tool runs in the background, with results appended later. On Terminal-Bench, SWE-Atlas, DeepSWE, and ALE-CLI with GPT-6 Astra xhigh, it costs up to 40% less than Codex and up to 20% less than Pi, with pass rates roughly equal. The post doesn't report latency numbers or results with non-GPT-6 models.