Vellum
by Vellum AI
LLM application platform with prompt management, evaluation, and deployment workflows for production AI features. Vellum is an LLM application development platform founded in 2023 in San Francisco. The product targets engineering teams that need versioned prompts, evaluation pipelines, and deployment infrastructure for shipping AI features into production applications.
Performance Scores
1 ranking evaluated
Score range: 8.4 – 8.4
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#1Best LLM App Platforms for Building AI Agents in 2026
Score: 8.4 · Best for: Product and ML teams shipping evaluated LLM features into production at mid-market and enterprise scale.
Key Facts
| Attribute | Value | As of | Source |
|---|---|---|---|
| Pricing | Pro plan approximately $500/month, Developer tier free, Enterprise custom | Apr 2026 | Vellum |
| Capabilities | Prompt IDE, Evaluations, Workflows, Deployments, RAG indexes (5 modules) | Apr 2026 | Vellum docs |
| Founded | 2023 | Apr 2026 | Y Combinator |
| Key Differentiator | Y Combinator W23 alumnus focused on prompt evaluation and regression testing for production LLM apps | Apr 2026 | Vellum |
Strengths
- ●Built-in evaluation harness with human review and regression testing
- ●Production-grade prompt versioning and rollout controls
- ●SOC 2 Type II with audit logs and RBAC
- ●Multi-model routing across OpenAI, Anthropic, Google, and self-hosted endpoints
Limitations
- ●Pricing oriented to mid-market and enterprise — limited free tier
- ●Lighter on prebuilt SaaS connectors than agent-first platforms
- ●Workflow visual builder is less mature than dedicated agent builders
Based on evaluations in 1 ranking: Best LLM App Platforms for Building AI Agents in 2026
About Vellum
Vellum is an LLM application development platform founded in 2023 in San Francisco. The product targets engineering teams that need versioned prompts, evaluation pipelines, and deployment infrastructure for shipping AI features into production applications.
The platform combines a Prompt IDE for testing variants across providers (OpenAI, Anthropic, Google, Azure), an Evaluation suite for regression testing prompt changes against test cases, a Workflows visual builder for chaining LLM calls with code, retrieval, and conditional logic, and a Deployments layer with versioning, monitoring, and request logs. Vellum supports retrieval-augmented generation through managed vector indexes and integrates with customer-supplied embeddings. Pricing starts with a free Developer tier (limited requests), with paid Pro plans approximately $500/month and Enterprise pricing custom-quoted as of public docs in April 2026.
Integrations (4)
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AI Agent PlatformsSee How It Ranks
Best LLM App Platforms for Building AI Agents in 2026
A ranked list of platforms for building LLM-powered applications and AI agents in 2026. This ranking covers tools that combine prompt engineering, model orchestration, retrieval-augmented generation, tool calling, and deployment into a single workflow for product and engineering teams. Entries span low-code agent builders (Gumloop, Lindy, Relevance AI), code-first orchestration (CrewAI), open-source visual builders (Langflow), enterprise prompt engineering platforms (Vellum), and team-oriented agent suites (Dust). Scoring reflects developer experience, model and integration breadth, pricing, governance posture, and runtime reliability.
Best AI Agent Platforms in 2026
AI agent platforms represent the next evolution in business automation, moving beyond fixed trigger-action sequences to autonomous agents that interpret goals and determine execution paths independently. This ranking evaluates 8 platforms on their agent autonomy capabilities, integration breadth, pricing accessibility, enterprise readiness, and community ecosystem as of March 2026. The ranked platforms span dedicated AI agent builders (Lindy, Gumloop), established automation platforms that have added AI agent features (Make, Zapier, n8n), and specialized tools that apply AI autonomy to specific domains (Bardeen for browser automation, Tines for security operations, Activepieces for open-source AI workflows). Scores reflect hands-on evaluation of each platform's ability to execute multi-step tasks with minimal human configuration.
Questions About Vellum
Is Vellum worth it in 2026? A detailed review
Vellum scores 7.4/10 in 2026. The Y Combinator W23 platform offers prompt management, evaluation suites, and deployment infrastructure for production LLM features, with Pro plans at approximately $500/month.
How much does Vellum cost in 2026?
Vellum offers a free Developer tier with limited requests, paid Pro plans at approximately $500/month, and custom Enterprise pricing as of April 2026.
Is Dust worth it in 2026? A detailed review
Dust scores 7.5/10 in 2026. The Paris-based AI assistant platform connects custom assistants to Notion, Slack, Drive, and GitHub at $29/user/month, backed by Sequoia and ex-OpenAI co-founder Stanislas Polu.
How much does Dust cost in 2026?
Dust offers a 14-day free trial, Pro plans at approximately $29/user/month, and custom Enterprise pricing with SSO and additional connectors as of April 2026.