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Does OpenRouter have Function Calling?
YES
Agent SDK tool loops; chat completions can carry tools depending on the model.
Does OpenRouter have Function Calling?
OpenRouter supports Function Calling. Developers can define custom tools/functions that the AI can choose to invoke, returning structured JSON arguments to execute actions. OpenRouter is a unified API across 80+ providers and 500+ models (text, image, video, audio). Agent SDK tool loops; chat completions can carry tools depending on the model.
- Tool
- 🔀 OpenRouter by OpenRouter
- Feature
- Function Calling · Developer
- Status
- Yes, requires free plan
- Notes
- Agent SDK tool loops; chat completions can carry tools depending on the model.
- Pricing
- Requires free plan.
- Source
- openrouter.ai
- Last verified
- 2026-09-02