Agent SDK: Building Multi-turn Agent Workflows on OpenRouter
GA6 months agoUnverifiedAdded Sep 24, 2026
The OpenRouter Agent SDK provides a callModel function to build multi-turn agent workflows. It supports tool calls, stop conditions, and cost tracking across over 400 models.
More OpenRouter releases
Every OpenRouter releaseBuild Your Own Harness with the Agent SDK
The OpenRouter Agent SDK allows developers to scaffold personalized coding agents with terminal UI or headless support for scripts and pipelines.
Introducing Workspaces
OpenRouter now supports Workspaces, allowing users to organize projects into separate environments. Each workspace features independent API keys, routing defaults, guardrails, and observability settings.
Create OpenRouter Accounts via CLI with Stripe Projects
Users can now create an OpenRouter account, generate an API key, and set up Stripe billing directly from the command line using Stripe Projects. This allows for automated account provisioning.
Response Caching: Zero Cost for Identical Requests
OpenRouter introduced a Response Caching header that enables caching for identical API requests. This feature reduces latency and eliminates costs for repeated requests.
New Audio APIs for Speech and Transcription
OpenRouter launched two new endpoints for audio transcription and speech synthesis. These APIs provide access to multiple providers under a single interface.
Announcing Video Generation
OpenRouter launched a video generation API that provides access to top video models through a single interface.
Consistent Web Search and Fetch Across Every Model
OpenRouter now enables tool-calling models to perform web searches and fetch page content. Users can choose from multiple search and fetch engines to integrate these capabilities into their workflows.
Human-in-the-Loop Tools for the Agent SDK
The OpenRouter Agent SDK now includes tools that allow agents to auto-resolve routine decisions while pausing for human input on high-stakes tasks. This implementation requires no loop-management code.
Also shipped on Apr 24, 2026
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