Legato
Open-source computer-use harness for any OpenAI-compatible model: Qwen, DeepSeek, Claude, or your own vLLM server.
It drives a desktop with a computer tool, waits for the screen instead of sleeping, and bounds every model call.
pip install "legatolabs[e2b]" # PyPI name: legatolabs. Import name: legato.
import os, legato
from e2b_desktop import Sandbox # needs E2B_API_KEY
agent = legato.Harness(model="qwen/qwen3.8-27b", base_url="https://openrouter.ai/api/v1",
api_key=os.environ["OPENROUTER_API_KEY"])
desk = Sandbox.create()
result = agent.run("Open the terminal and print the date", legato.attach(desk))
print(result.report()) # where the time went
desk.kill()
Or from the shell: legato run "Open the terminal and print the date" --model qwen/qwen3.8-27b --base-url https://openrouter.ai/api/v1
Results
Same model, same desktops, 24 office tasks per run. Method and raw data.
| Model | Compared with | Time | Success |
|---|---|---|---|
| Claude Sonnet 5.5 | Anthropic's reference loop | 1.48x faster | 48/48 vs 48/48 |
| Qwen3.8-27B | OSWorld's Qwen agent | same | 71/96 vs 53/96 |
How
- Waits until the screen stops changing instead of a fixed 2 s sleep.
- Up to 3 actions per turn, one screenshot after them.
- Drops old screenshots in chunks so the prompt cache keeps hitting.
- A wall-clock timeout and a token budget on every model call.
More
- Models · Sandboxes · MCP server · RL rollouts · FAQ
- Compare: Anthropic's demo · OSWorld's Qwen agent · Agent S3 · UI-TARS-desktop
- Migrate: from cua-agent · from Bytebot
- For coding agents: llms.txt · AGENTS.md
Apache-2.0. Hosted desktops and models: legato.computer.
1 maintainer
Metadata
1 maintainer
Release files for legatolabs 0.1.1
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