📖 The AI Tool Bible

Claude Agent SDK vs Vellum

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

 
Claude Agent SDK
Agents
Vellum
Agents
TaglineAnthropic's official SDK for building autonomous Claude agents.Personal AI assistant with persistent memory across email, calendar, and chat channels.
CategoryAgentsAgents
PricingFree· Free SDK; API usage billed at Claude ratesFreemium· Free tier + API costs; paid plans available
ModelClaude Opus / SonnetMulti-model (Claude-class LLMs)
Editorial score8.6 / 10—
Use cases
Claude agentstool useproduction
personal assistantemail triagecalendar managementmeeting prepresearchtask automation
Pros
  • Official, well-tested abstractions
  • Same primitives as Claude Code
  • Strong tool-use ergonomics
  • TypeScript + Python SDKs
  • Persistent multi-type memory across sessions
  • Works across Mac, Web, iOS, Slack, Telegram, phone, CLI
  • Managed OAuth into Gmail, Calendar, Slack
  • Open-source with self-host option
  • Fast onboarding (sub-30-second setup)
Cons
  • Claude-only
  • Newer than LangGraph/CrewAI
  • Requires broad access to inbox and calendar
  • Pricing tiers not publicly itemized
  • Young product in a crowded assistant space
  • Relies on third-party LLM costs on top of plan
Websitedocs.claude.comvellum.ai
Pick Claude Agent SDK if
  • ✅ Official, well-tested abstractions
  • ✅ Same primitives as Claude Code
  • ✅ Strong tool-use ergonomics
  • ✅ TypeScript + Python SDKs
Pick Vellum if
  • ✅ Persistent multi-type memory across sessions
  • ✅ Works across Mac, Web, iOS, Slack, Telegram, phone, CLI
  • ✅ Managed OAuth into Gmail, Calendar, Slack
  • ✅ Open-source with self-host option
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