Frequently Asked Questions

League of LLMs is a free AI comparison arena. Instead of opening multiple tabs and copy-pasting the same prompt into different AI tools, you write your question once inside the arena, select the models you want to test, and every response loads side by side in the same workspace. When all models have responded, the built-in AI judge evaluates every answer and highlights the strongest one, so you can move forward with confidence instead of spending time manually comparing walls of text.

AI models are not interchangeable. Each one has different training data, reasoning tendencies, and output styles. GPT-4o may handle multi-step logic more precisely, Gemini may interpret a visual diagram more accurately, and Mistral may produce cleaner, more concise code. When you only use one model, you are implicitly trusting that it is the best tool for that specific question, and that is rarely true. Comparing multiple models on the same prompt tells you which one to trust for the task at hand and often surfaces a better answer than any single model would have given you alone.

Yes. When you write your prompt in the arena, you can attach a JPG, PNG, or PDF file directly to the query. Vision-capable models will parse the content automatically, whether it is a diagram, a screenshot, a scanned document, or a multi-page report. Models that do not support vision will respond to the text portion of your query only, and the arena will clearly indicate which models processed your file.

After all selected models have responded to your prompt, the built-in AI judge reads every answer and evaluates them against your original question. It considers factors like accuracy, completeness, clarity, and how well each response actually addresses what you asked. It then highlights the strongest response and, where helpful, explains why that answer stands out. The goal is to save you from having to read every word of every response, especially when you are comparing five or more models at once.

Yes. You need to create a free account before using the arena so the service can protect access and keep your comparison history attached to you. Signing up requires only your email address and no payment details. Once you are in, you can immediately write prompts, compare models, upload files, and get the AI judge evaluation in the same workspace.

League of LLMs currently supports OpenAI, Groq, GLM, Cohere, Mistral, Hugging Face, and Gemini. We add new providers as they become available and production-ready. Check the Changelog page to see the latest additions.

When you run a comparison, your prompt and any attached files are sent to the AI providers you selected, for example OpenAI to generate a GPT response or Google to generate a Gemini response. This is the same data transfer that happens when you use those tools directly. Query content is not stored permanently on League of LLMs servers. For full details on what we collect and how we use it, see the Privacy Policy.

Yes, completely. There are no query limits, no trial periods, and no credit card required. The arena is free to use in full. If we ever introduce optional advanced features in the future, the core comparison experience will remain free. The Pricing page keeps that promise clear.