Zexus
In-process Revit AI agent that dynamically compiles C# code from prompts to automate BIM API tasks.
Automate Revit operations by generating and executing C# code directly against live BIM models via prompts.
Zexus is an open-source add-in for Autodesk Revit that lets you run BIM automation tasks using natural language prompts. It converts your requests into C# code and compiles it on the fly via Roslyn to interact directly with the active document. You should use it if you want custom Revit API execution without writing or maintaining separate script files.
What it is
The tool runs directly inside the Revit process as a ribbon tab plugin and interfaces with models using runtime-compiled C#. It integrates with Anthropic, OpenAI, or Google LLMs to convert natural language into API calls. Read actions execute immediately, while model-modifying write operations require explicit user approval through built-in guardrails.
Who it's for
This tool suits BIM managers, computational designers, and Revit power users who need flexible automation without writing custom C# plugins or managing script libraries. It is not suitable for users looking for a standalone desktop app that runs outside of Autodesk Revit.
Key features
In-process Roslyn C# compilation
Compiles generated C# code in memory directly against the active Revit document for unrestricted API access.
Multi-provider LLM integration
Connects to Anthropic, OpenAI, or Google AI models using your personal API keys.
Write-operation guardrails
Requires manual user confirmation and presents an action plan before executing any model-modifying transaction.
Native Revit ribbon plugin
Installs as a per-user MSI add-in compatible with Revit versions 2022 through 2026.
Up and running in 3 steps
Our honest verdict
What's great
- Accesses the full Revit API on demand through runtime C# compilation rather than fixed tools.
- Provides built-in confirmation prompts before executing model-altering transactions.
- Supports multiple major LLM providers including Anthropic, OpenAI, and Google.
- Installs via a simple per-user MSI without requiring administrator rights.
Where it falls short
- Requires your own API keys from Anthropic, OpenAI, or Google, incurring ongoing LLM usage costs.
- Only functions within supported versions of Autodesk Revit on Windows.
- Dynamic code generation carries risks if model write confirmations are blindly accepted.
Pricing & license
Zexus is completely free and open-source under the Apache-2.0 license. There are no paid tiers or hosted versions provided by the developer. Your only cost is the per-token usage fees charged directly by your chosen LLM provider (OpenAI, Anthropic, or Google).
Open remote AI-training roles
767 open remote AI-training roles, updated November 14, 2026; most pay $20–$175 an hour. Zekai lists them free; the application goes to the employer’s platform.
Alternatives
These reviewed AI tools do the same job instantly — from our scored directory.
Use it, or have us set it up
FAQ
Do I need administrator privileges to install Zexus?
No, the provided MSI installer operates on a per-user basis and installs without elevated admin rights.
Which Revit versions are supported by Zexus?
Zexus supports Revit 2022 through 2026 across .NET Framework 4.8 and .NET 8 environments.
Does Zexus require a subscription to use?
The Zexus plugin itself is free and open-source, but you must pay for your own API usage with Anthropic, OpenAI, or Google.
