Factory Releases Droid 1.0 with Programmatic Tool Calling
Factory has released Droid 1.0, a new harness engine for coding agents featuring default 'programmatic tool calling'. This mechanism allows models to write sandboxed JavaScript to invoke tools, returning only printed output to the model while isolating raw files and logs. Benchmark results on Terminal-Bench 4 show improvements over competitors, though data is self-reported and task duration increases slightly.
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▲ Marktechpost AI · 2026-10-31 10
▲ Factory just released Droid 1.0, a new harness engine for its coding agent that lets the model write programs that call tools.
The key idea is programmatic tool calling, now on by default. The model writes JavaScript that runs in a sandbox and invokes tools. Raw files, logs and search results stay inside the program, and only printed output returns to the model.
On Factory's Terminal-Bench 4 runs, Droid scores 65.2% with Claude Opus 5.5, versus 57.6% for Claude Code on the same model. With GPT-6.1 Sol it scores 57.6% versus 54.0% for Codex, at 12% lower cost. It is a trade-off though: on GPT-6.1 Sol, Droid takes 10% longer per passed task than Codex, and every number is self-reported.
Droid 1.0 is available now as a macOS and Windows desktop app, a terminal UI, and the @factory/droid-sdk for Node.....
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