The Dynamo team released Dynamo Core 4.3 on November 10, 2026. The main change puts users back in control of AI edits: when Autodesk Assistant rewrites a Python Script node, you now see the code before and after and decide whether to keep it.
What’s new
- Python review window. Each Assistant change to a Python node opens a before-and-after view. You accept or reject the edit, and the Python editor stays in sync with what Assistant changed.
- Four new DynamoMCP tools. AI clients can now move nodes, read the whole graph as JSON, switch the Python engine (the engine name is validated) and roll back their own Python edit. DynamoMCP moves from version 0.6.2 to 0.6.6.
- More predictable Assistant behaviour. According to the release post, Assistant asks a short clarifying question when a request is ambiguous, edits an existing Code Block in place, keeps Manual run mode while building, and undoes all edits from one prompt as a single step. The bundled Assistant package moves from 0.3.8 to 0.4.0.
- Geometry kernel. Dynamo now uses ASM 233 while staying compatible with ASM 232.
- Smaller fixes. Number, slider and DateTime nodes keep their last valid value after bad input, File > New > From Template works again, and a bug where Assistant went blank in Revit after Dynamo was closed is fixed.
Why it matters
Letting an AI assistant rewrite Python inside a production graph has been a hard sell for BIM managers. A visible diff with an explicit accept step is the kind of guardrail that makes the feature usable on real projects.
Availability is the catch. Dynamo 4.3 is only available as Dynamo Sandbox for now, from dynamobuilds.com or the GitHub release page. The team says it will reach host integrations such as Revit “at a future date”. Revit 2027.4, released the same day, ships Dynamo 4.2.2, not 4.3.
What to do now:
- Test 4.3 in Sandbox if you script with Assistant or build MCP workflows.
- Keep production graphs on the Dynamo version that ships with your Revit build.
- Watch the Revit update notes for the version that brings 4.3 inside Revit.
Source
- Dynamo BIM: Dynamo Core 4.3 release (Helena Wahlstrom, November 10, 2026)
