ToolVS

Does ChatGPT Have Tool Use / Function Calling?

By ToolVS Research Team ยท Last checked April 1, 2026

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YES

Yes, OpenAI's API supports function calling (tool use), allowing GPT models to invoke functions you define with structured JSON arguments.

What We Found

We checked this in April 2026 and here's what we found โ€” OpenAI's function calling lets you define functions with JSON Schema. GPT-4o and GPT-4 Turbo can decide when to call functions and return structured arguments. Supports parallel function calling, forced function calls, and structured outputs. Essential for building AI agents and integrations.

Things to Know

Need Tool Use / Function Calling? These Tools Have It

ClaudeCheck Claudeโ†’GeminiCheck Geminiโ†’

Try ChatGPT Yourself

See if tool use / function calling meets your needs. Most tools offer a free trial or free plan to get started.

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More About ChatGPT

Does ChatGPT have free plan?โœ… YESDoes ChatGPT have api access?โœ… YESDoes ChatGPT have mobile app?โœ… YESDoes ChatGPT have dark mode?โœ… YESDoes ChatGPT have plugins / gpts?โœ… YESDoes ChatGPT have file upload?โœ… YES

Frequently Asked Questions

Does ChatGPT have tool use / function calling on mobile?
ChatGPT offers tool use / function calling across platforms including mobile. However, the mobile experience may have some limitations compared to the desktop version. Check the mobile app for the latest capabilities.
Is tool use / function calling available on ChatGPT's free plan?
Tool Use / Function Calling is available in ChatGPT, though specific plan requirements may apply. Some features are limited to paid tiers. Check ChatGPT's pricing page for the most current plan details.
What are the best alternatives to ChatGPT for tool use / function calling?
For tool use / function calling, consider Claude, Gemini. These tools offer this feature and may better suit your needs. Check our comparison pages for detailed side-by-side analysis.
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About this check: We verify feature availability by reviewing official documentation, testing the product directly, and monitoring changelog updates. Information was last verified on April 1, 2026. Features and pricing may have changed since our last check.Our methodology โ†’