Top function calling AI tools

Mistral AI is a research lab developing state-of-the-art open-source and commercial Large Language Models (LLMs) for developers and enterprises.

• Other

Composio is a developer-first integration platform that connects AI agents and LLMs with over 250 tools and services, offering managed authentication and improved reliability for building AI-powered applications.

• Freemium
• From 199$

Symphony enables developers to build applications that understand and respond to natural language commands by linking text inputs to executable code functions.

• Contact for Pricing

Rubra provides a collection of open-weight large language models (LLMs) enhanced with tool-calling capabilities, ideal for building AI agents.

• Free

Toolhouse is a complete cloud infrastructure platform that enables developers to equip LLMs with actions and knowledge using just 3 lines of code, offering a Tool Store for instant integration of AI capabilities.

• Freemium

BoundaryML (BAML) is a language designed for reliable structured text generation from Large Language Models (LLMs). It offers features like JSON error correction, schema coercion, and improved function-calling.

• Freemium

ResponseCX provides AI-powered customer service for Shopify brands, automating ticket resolution, order changes, and returns with 24/7 availability and high customer satisfaction.

• Paid
• From 1520$

Chatsistant is a comprehensive conversational AI framework platform that allows businesses to build and deploy AI chatbots for enhanced customer experience and operational efficiency.

• Freemium
• From 10$

Exfunc provides a Web Task API allowing users and AI agents to fetch data and perform actions on the web via simple API calls.

• Freemium

Superface is a connectivity tooling platform for AI agents that enables seamless integration of external apps with intelligent tools, featuring managed OAuth and end-user authentication flows.

• Contact for Pricing

Cheshire Cat AI is a framework for building, training, and deploying customizable AI agents. It allows users to train agents on their documents and connect them to external APIs and applications.

• Free

AgentRPC is a universal RPC layer designed to unify tools from multiple programming languages into a single interface for AI agents, enabling connectivity across networks, including private VPCs.

• Freemium
• From 20$

Gorilla is an open-source Large Language Model (LLM) developed by UC Berkeley, designed to interact with a wide range of services by invoking API calls.

• Free

OpenTools provides a unified API enabling developers to connect Large Language Models (LLMs) with a diverse ecosystem of tools, simplifying integration and management.

• Usage Based