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Physix Frontier · News Briefing Card (Hacker News · Sep 22, 2026)

Devin Ships SWE-2 Model and Fusion Mode, Tested for a Week

KEY FACTS

  • The author tried Devin's desktop app, CLI, SWE-2 model, and Fusion mode for about a week.
  • The Devin desktop app appears to have merged the old WindSurf, and old chat history once showed up in the session list.
  • The CLI supports /cloud and /handoff commands, which can move tasks to the cloud or run them on a remote VM.
  • SWE-2 was tested on the real project Documenso, performing close to Fable 5.1 but at lower cost.
  • Fusion mode has frontier models plan and SWE-2 execute, aiming to cut usage costs.

PHYSIX OBSERVATION

Devin splits frontier models and cheap models into two layers, planning and execution, and Fusion mode is a pragmatic answer to cost anxiety. SWE-2's concise output and smooth browser operation show that agent competition is shifting from benchmark scores to real-task experience. But the desktop app and CLI feel disjointed, session sync is missing, and product integration remains a weak spot.

Source: Hacker News report