Puter.js Offers 400+ Free LLMs. No API Keys Required. Read The Fine Print.
Puter.js provides access to GPT, Claude, Gemini, Grok, DeepSeek, and over 400 other models without API keys or developer payments. It uses a User-Pays model where each end user covers their own usage through their personal Puter account, meaning the developer incurs zero cost regardless of scale. This differs from conventional free tiers, which are typically rate-limited trials that convert to paid usage as an application grows.
The underlying principle here is cost shifting, which is not the same as cost elimination. Someone pays for compute, just not the developer. The User-Pays model externalizes infrastructure costs to end users' accounts, which is clever but creates a dependency on Puter's continued existence and pricing structure. Understand the difference between 'free at my layer' and 'free,' because they are not the same thing.
Puter offers this through their developer platform at developer.puter.com. The tutorial covers access to 400+ models including GPT, Claude, Gemini, Grok, and DeepSeek, all through the Puter.js library.
- Visit developer.puter.com and locate the free LLM API tutorial to see the script tag needed to include Puter.js in a webpage.
- Create a free Puter account at puter.com to understand what your end users would experience when they authenticate.
- Copy the minimal code example from the tutorial into a text file, save it as an HTML file, and open it in your browser to see which models respond, confirming the User-Pays flow firsthand.