2025

August 2025

Composio Tool support

August 7th, 2025

We’ve added support to connect to over 250+ apps and 10K+ tools through our partner integration with Composio.

Composio makes it easy to connect with external data sources, APIs, and services, allowing you to extend the capabilities of your Vellum workflows. It’s a powerful way to integrate with tools like Google Sheets, Slack, Salesforce, and many more, enabling you to build complex workflows that interact with a wide range of external systems. It’s perfect for those who want to build internal tools or automate business processes.

Once all set up, you can add Composio as a Tool in Agent Nodes (formerly known as Tool Calling Nodes) in your workflows.

Add Composio Tool

You can then use Composio to call any of the supported tools in your Workflow. Composio Tool Selector

To make use of Composio, you’ll need to:

  1. Sign up for a Composio account
  2. Configure the integrations you’re interested in
  3. Create a Composio API Key
  4. Add the Composio API Key to as an Environment Variable in your Vellum Workspace

Insert Node Panel UX Improvements

August 7, 2025

We’ve updated the Insert Node Panel in the Workflow Builder with several UX improvements to make it easier to find and add nodes to your workflows:

Screenshot of the new Insert Node Panel showing the search bar, reorganized cards, and nested hierarchy with Basic Nodes and Execution Logic sections
Updated Insert Node Panel with search functionality and improved organization

Key improvements include:

  • Search Bar: Quickly find specific nodes by typing their name
  • Updated Copy: Clearer, more concise descriptions for each node type
  • Smaller Cards: More compact design that fits more nodes on screen
  • Reorganized Layout: Better categorization with logical groupings
  • Nested Hierarchy: Expandable sections for Control Flow and other categories
Screenshot showing the expanded Control Flow section with various node types including Guardrail, Error, Conditional, Map, and Merge nodes
Control Flow section with nested hierarchy showing Guardrail, Error, Conditional, Map, and Merge nodes
  • Split Subworkflow Options: Subworkflows are now clearly separated into “Start from Scratch” and “Deployed Subworkflow” options for better clarity
Screenshot of the Subworkflow section showing two distinct options: Start from Scratch and Deployed Subworkflow
Subworkflow section showing the split between Start from Scratch and Deployed Subworkflow options

We hope that these improvements make it easier to find the building blocks you need to create powerful AI workflows in Vellum. As always, we welcome your feedback on these changes!

GPT 5 on OpenAI

August 7, 2025

We’ve added support for OpenAI’s latest GPT-5 models. You can find both API variants on our Models page for each GPT-5 Model:

  • GPT-5 via Chat Completions API
  • GPT-5 via Responses API
  • GPT-5 Mini via Chat Completions API
  • GPT-5 Mini via Responses API
  • GPT-5 Nano via Chat Completions API
  • GPT-5 Nano via Responses API

GPT OSS 120B on Cerebras

August 5th, 2025

We’ve added support for GPT OSS 120B on Cerebras.

GPT OSS Models on Groq

August 5th, 2025

We’ve added support for GPT OSS 120B and 20B on Groq.

Anthropic’s Claude Opus 4.1

August 5th, 2025

We’ve added support for Anthropic’s latest model Claude Opus 4.1.

OpenAI’s GPT OSS Models

August 5th, 2025

We’ve added support for OpenAI’s two latest models:

Cerebras Qwen 3 480B Models

August 5th, 2025

We’ve added support for the three newest variants of the Qwen 3 480B models:

  • Qwen 3 Coder 480B on Cerebras
  • Qwen 3 Thinking 480B on Cerebras
  • Qwen 3 Instruct 480B on Cerebras

Vertex AI Gemini 2.5 flash lite for Finetuning

August 4th, 2025

We’ve added support for Gemini 2.5 Flash finetuned models. You can add finetuned Vertex AI models to your Workspace by selecting “Fine-tuned Vertex AI Models” on the models page.