Changelog | April, 2025

Dynamic Model Select on Inline Prompt Nodes

April 29th, 2025

Inline Prompt Nodes now accept expression inputs to represent the Model invoked in the Prompt. Previously, you could only statically choose a model from a list of available models. Now, you can also dynamically reference a model from an upstream Node or Workflow Input.

Ports on Workflow Nodes

April 28th, 2025

All Workflow Nodes now support Ports. Previously you had to define a Conditional Node for control flow in a workflow. Now you can define Ports using Expression Inputs to define the control flow you want.

Non-Streaming Prompt Nodes

April 28th, 2025

Prompt Nodes now support the option to run as streaming or non-streaming. The latter is considered more performant during parallelization or Workflows that feature Map Nodes.

Test Suite Run Progress

April 25th, 2025

It’s now possible to see the progress of an evaluation report run while it’s actively running. Hovering over the progress indicator, a tooltip will display the number of test cases being run and the number of test cases completed.

Run From Node Re-enabled for SDK-Enabled Workflows

April 22nd, 2025

Back in March, we needed to temporarily disable our Run From Node feature while we reimagined how it should be designed in this new paradigm. Today, we are excited to announce that we are bringing back this beloved feature for all SDK-Enabled Workflows.

Just as before, to invoke the a Workflow starting from a given Node, click the mini play button that appears on the Node when a previous execution is loaded. This will use the “State” we saved from the previous execution in order to run the Workflow from that exact point in time going forward.

o4 Mini and o3 Models on Vellum

April 16th, 2025

We’ve added OpenAI’s newest Models to Vellum:

• o3
• o4 Mini

Metric Mapper Revamp

April 15th, 2025

We’ve introduced a revamped UI that makes it easier to configure Metrics within the context of Evaluations. A Metric’s inputs are now automatically mapped to existing variables based on their name and type. We also now clearly indicate which inputs are required and simplify the process of using constant values. All in all, we hope that with these changes, it requires fewer clicks to set up a Metric and understand where it’s getting its inputs from!

Llama 4 Maverick via Groq on Vellum

April 14th, 2025

We’ve added support for Llama 4 Maverick 17B Instruct via Groq to Vellum

GPT 4.1 Models on Vellum

April 14th, 2025

We’ve added the new GPT 4.1 Models via OpenAI to Vellum:

• GPT-4.1
• GPT-4.1 (2025-04-14) Snapshot
• GPT-4.1 Mini
• GPT-4.1 Mini (2025-04-14) Snapshot
• GPT-4.1 Nano
• GPT-4.1 Nano (2025-04-14) Snapshot

xAI Models on Vellum

April 14th, 2025

We’ve added the new xAI models to Vellum:

• Grok 3 Beta
• Grok 3 Fast Beta
• Grok 3 Mini Beta
• Grok 3 Mini Fast Beta

Sandbox Cost Tracking for Workflows

April 8th, 2025

We’ve now added cost tracking support for your Subworkflow and Deployment Subworkflow Nodes from inside our Workflow Sandbox. This is an aggregate sum of total costs for your workflow invoked by your Subworkflow Nodes, available immediately after running your workflow!

Llama 4 Models on Vellum

April 5th, 2025

We’ve added the new Llama 4 models to Vellum. These models are the latest and greatest from Meta.

The new models are available from the following providers:

• Fireworks AI
  • Llama 4 Scout
  • Llama 4 Maverick
• Groq
  • Llama 4 Scout

Add Node on Edge Drop

April 3rd, 2025

Previously, the only way to add a Node was to drag and drop a new Node from the Nodes Panel. We’ve now introduced a faster way to add and connect Nodes: simply drag an edge from an existing Node and drop it where you want the new Node to be. A Node selection menu will appear at that location, allowing you to choose the type of Node you want to add. The new Node will be automatically placed and connected to the edge.

Protected Release Tags

April 1st, 2025

You can now specify Release Tags that should be considered “protected.” This feature is meant to be used in conjunction with our recently released Deployment Release Reviews feature.

A protected Release Tag cannot be assigned to a Prompt or Workflow Deployment Release unless that Release has at least one approval from a Reviewer and no outstanding change requests. This feature is useful for ensuring that critical or sensitive Deployments are reviewed and approved before going live.

Grouping a Selection into a New Subworkflow Node

April 1st, 2025

Previously, creating Subworkflows and organizing Nodes within them required manual copy-pasting of Nodes. We’ve now introduced a powerful new way to organize your Workflows by grouping Nodes into Subworkflows. You can now select multiple Nodes and automatically convert them into a new Subworkflow Node, which will maintain all the existing connections. Additionally, you can drag and drop selected Nodes onto existing Subworkflow Nodes to move them inside.

This feature helps you better organize complex Workflows into logical components while reducing visual clutter in your Workflow canvas. When grouping Nodes, all existing connections and logic are automatically maintained, and you can easily modify Subworkflow contents through simple drag and drop interactions.