ChatGPT vs Vellum
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose ChatGPT if you want openai's ai assistant: chat, voice, image, search, deep research, and agent mode (Assistant, freemium); choose Vellum if you want platform to build, evaluate, and deploy llm apps and ai agents (Supervised agent, contact).
| ChatGPT | Vellum | |
|---|---|---|
| What it is | OpenAI's AI assistant: chat, voice, image, search, deep research, and agent mode | Platform to build, evaluate, and deploy LLM apps and AI agents |
| Type | product-with-agents | platform |
| Autonomy | Assistant | Supervised agent |
| Pricing | freemium · Free; Plus reported at $20/mo | contact |
| Best for | consumers, smb, enterprise, developers | developers, enterprise |
| Deployment | saas, api | saas, api |
| Modalities | text, voice, image, code, browser, api | text, code, api |
| Models | gpt, proprietary | model-agnostic, gpt, claude, gemini |
| Protocols | mcp, function-calling, rest-api | mcp, function-calling, rest-api |
| Integrations | Google Drive, GitHub, Gmail, Microsoft 365, Slack, MCP connectors | Composio, OpenAI, Anthropic, Google Gemini, AWS Bedrock, Cursor |
| Capabilities | 6 documented | 4 documented |
ChatGPT
- +Broadest, most capable consumer AI assistant: chat, voice, image, search, files, and code in one place
- +Generous free tier plus a clear ladder of paid plans (Go, Plus, Pro, Business, Enterprise)
- +Agentic surfaces (deep research, agent mode) layered on top for users who need multi-step work
- -Mostly an assistant: the base product responds when asked rather than acting autonomously
- -Best agentic and reasoning features are gated to higher-priced paid tiers
Vellum
- +Genuinely model-agnostic with a large, frequently updated catalog, avoiding lock-in
- +Covers the full LLM lifecycle (experiment, evaluate, deploy, monitor) in one place
- +Strong agent tooling with first-class MCP, Composio integrations, and auto-generated function-calling schemas
- -Brand and domain confusion: the apex vellum.ai domain appeared to host an unrelated product at this review
- -Platform pricing is not transparently published (sales-led, enterprise-leaning)
Which should you choose?
ChatGPT is openai's ai assistant: chat, voice, image, search, deep research, and agent mode, best for consumers, smb, enterprise, developers. Vellum is platform to build, evaluate, and deploy llm apps and ai agents, best for developers, enterprise. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.