Claude Agent SDK

Pricing

• 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 @anthropic-ai/claude-agent-sdk

pip install claude-agent-sdk

uv add claude-agent-sdk

Models

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.

Recent changes

• Oct 16TypeScript SDK 0.3.302 turns fork subagents on by default in SDK sessions and, with telemetry off or on a fresh install, starts an omitted permissionMode in default mode on third-party providers.
• Oct 15TypeScript SDK 0.3.301 adds per-tool permission policies (always_ask, always_deny) for SDK MCP servers and lets Query.reloadPlugins() load more plugin folders into a running session.
• Oct 14TypeScript SDK 0.3.300 cuts the browser bundle download by 40% and validates updatedInput from PreToolUse and PermissionRequest hooks like Claude's own input.

Sources: Agent SDK overview, Agent SDK quickstart, Model configuration, TypeScript SDK CHANGELOG

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