Free LLM API Resources and Online Chatbot Indexes

March 2025 Update

1. OpenAI-Based Chatbot

These chatbots use OpenAI models like GPT-4o, o3-mini, and o1-preview, with varying degrees of free access.

• ChatGPT (GPT-4o / o3-mini) – OpenAI’s flagship chatbot with free and pro tiers.

• Microsoft Copilot (GPT-4o / OpenAI o1) – Free, no sign-up required, supports SydneyQT jailbreak.

• DuckDuckGo AI (o3-mini) – Quick access to GPT-4o and other models, no sign-up required.

• NexusAI (GPT-4o / o1-preview / o3-mini) – Multiple OpenAI models for free.

• Chatbot Arena – Compare multiple chatbots, no sign-up required.

• ChatK / LobeChat – GPT-4o and other chatbots in one interface.

• FFA Chat – Free GPT-4o with access to multiple chatbots.

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2. Open-Source & Alternative LLM Chatbots

These platforms provide free access to open-source and alternative AI models.

• Mistral AI – Various open-source models, optimized for different tasks.

• HuggingChat – Open-source chatbots hosted by Hugging Face.

• Infermatic – A collection of AI models with free access.

• Electron Hub – Multi-LLM chatbot platform.

• NextChat – Provides multiple AI chatbots for free.