Type-safe TypeScript SDK for accessing 300+ AI models through OpenRouter's unified API.

• Provides the callModel pattern for text generation, tool usage, streaming, and multi-turn conversations with automatic tool execution
• Supports flexible input formats: strings, message arrays, multimodal content with images, and system instructions
• Includes a strongly-typed tool system using Zod schemas with regular, generator, and manual tool modes; tools can modify parameters for subsequent turns via nextTurnParams
• Offers multiple response consumption methods: getText(), getResponse(), getTextStream(), getReasoningStream(), and getToolCallsStream() with concurrent consumer support
• Provides OAuth PKCE flow for user-facing applications and API key management, plus stop conditions (stepCountIs, maxCost, hasToolCall) to control multi-turn execution and costs