Vercel AI SDK vs Claude Agent SDK
Vercel AI SDK and Claude Agent SDK side by side: what each one is, verified plan pricing and install commands where we have them, and the full review of each.
Vercel AI SDK
EssentialThe TypeScript toolkit for building AI apps. Unified API across OpenAI, Anthropic, Google. Streaming, tool calling, structured output, multi-step agents. 27K+ GitHub stars.
Claude Agent SDK
Anthropic's SDK for building agents on the same tools, agent loop, and context management that power Claude Code. Python and TypeScript. Subagents, hooks, MCP, and permissions.
At a glance
| Field | | |
|---|---|---|
| Category | AI Frameworks | AI Frameworks |
| Website | sdk.vercel.ai | docs.anthropic.com |
| Pricing | AI SDK - free and open source (Apache-2.0); Vercel AI Gateway (the default when you pass a model string) - free tier with $5/month credit on Free Tier eligible models, then pay-as-you-go credits at provider list rates with zero markup; bring-your-own-key on the paid tier; Provider packages such as @ai-sdk/openai or @ai-sdk/anthropic - billed by each provider on your own API key | Anthropic API key - pay per token at Claude API rates; Amazon Bedrock, Claude Platform on AWS, Google Cloud Agent Platform, or Microsoft Foundry - billed through that cloud account; claude.ai login and plan rate limits - not allowed for third-party products unless previously approved by Anthropic |
| Install | npm install ai or npm install @ai-sdk/openai @ai-sdk/anthropic @ai-sdk/google or npx skills add vercel/ai | npm install @anthropic-ai/claude-agent-sdk or pip install claude-agent-sdk or uv add claude-agent-sdk |
| Models | Pass a provider/model string such as anthropic/claude-opus-5.5 or openai/gpt-6-astra to route through Vercel AI Gateway by default, or import a provider package (OpenAI, Anthropic, Google, xAI, Azure, Amazon Bedrock, Mistral, DeepSeek, Groq and more) to call it directly. HarnessAgent also runs agent harnesses such as Claude Code and Codex through the same stream primitives. | Claude models only. Set the model option or call setModel() with an alias (opus, sonnet, haiku) or a full model ID; on the Anthropic API the aliases resolve to Opus 5.5, Sonnet 5.5 and Haiku 5.5, while Claude Platform on AWS, Amazon Bedrock and Google Cloud Agent Platform resolve sonnet and haiku to older versions and Microsoft Foundry resolves all three aliases to older versions. |
| Last verified | October 25, 2026 | October 26, 2026 |
In Depth
Vercel AI SDK
The Vercel AI SDK is the standard TypeScript library for building AI-powered applications. It provides a unified interface - write code once, swap between OpenAI, Anthropic, Google, or any provider. Key features: streaming chat responses, structured JSON output with Zod schemas, tool calling with automatic execution, and multi-step agent loops. The `ai` core package handles the LLM interaction, `@ai-sdk/react` provides React hooks (useChat, useCompletion), and `ai/rsc` enables server-side streaming with React Server Components. Over 27K GitHub stars. I use it in nearly every project and built a complete course on it for this site.
Claude Agent SDK
The Claude Agent SDK gives you the same tools, agent loop, and context management that power Claude Code, programmable in Python and TypeScript. Built-in tools read, write, and edit files and run commands; hooks run your own code at key points in the agent lifecycle; subagents take focused subtasks; MCP connects external tools and data; permissions control which tools run automatically and which need approval; and sessions can be resumed or forked. It also loads skills, commands, and memory from a project's .claude/ directory, just like Claude Code. It competes with OpenAI's Agents SDK and LangChain. I use it when building Python-based agents that need reliability and structured workflows.
FAQ
Answers taken from each tool's verified fact sheet, with the date it was last checked.
How much does Vercel AI SDK cost?
As of October 25, 2026: AI SDK - free and open source (Apache-2.0); Vercel AI Gateway (the default when you pass a model string) - free tier with $5/month credit on Free Tier eligible models, then pay-as-you-go credits at provider list rates with zero markup; bring-your-own-key on the paid tier; Provider packages such as @ai-sdk/openai or @ai-sdk/anthropic - billed by each provider on your own API key. Source: AI SDK introduction, AI SDK providers and models, vercel/ai README, vercel/ai releases, ai package changelog, @ai-sdk/workflow 2.0.0 release, Vercel AI Gateway pricing.
How do I install Vercel AI SDK?
Official install commands as of October 25, 2026: npm install ai or npm install @ai-sdk/openai @ai-sdk/anthropic @ai-sdk/google or npx skills add vercel/ai.
Which models does Vercel AI SDK use?
As of October 25, 2026: Pass a provider/model string such as anthropic/claude-opus-5.5 or openai/gpt-6-astra to route through Vercel AI Gateway by default, or import a provider package (OpenAI, Anthropic, Google, xAI, Azure, Amazon Bedrock, Mistral, DeepSeek, Groq and more) to call it directly. HarnessAgent also runs agent harnesses such as Claude Code and Codex through the same stream primitives.
How much does Claude Agent SDK cost?
As of October 26, 2026: Anthropic API key - pay per token at Claude API rates; Amazon Bedrock, Claude Platform on AWS, Google Cloud Agent Platform, or Microsoft Foundry - billed through that cloud account; claude.ai login and plan rate limits - not allowed for third-party products unless previously approved by Anthropic. Source: Agent SDK overview, Agent SDK quickstart, Model configuration, TypeScript SDK CHANGELOG.
How do I install Claude Agent SDK?
Official install commands as of October 26, 2026: npm install @anthropic-ai/claude-agent-sdk or pip install claude-agent-sdk or uv add claude-agent-sdk.
Which models does Claude Agent SDK use?
As of October 26, 2026: Claude models only. Set the model option or call setModel() with an alias (opus, sonnet, haiku) or a full model ID; on the Anthropic API the aliases resolve to Opus 5.5, Sonnet 5.5 and Haiku 5.5, while Claude Platform on AWS, Amazon Bedrock and Google Cloud Agent Platform resolve sonnet and haiku to older versions and Microsoft Foundry resolves all three aliases to older versions.
