OpenRouter Chat is a browser playground for comparing language models on a single prompt. You pick one or more models from a catalog of more than 500, send the same message to each, and read the replies side by side. It is part of OpenRouter, which routes requests to over 80 providers, so the same account covers both chat and API access. A Free plan includes 25+ free models and 50 requests per day, while Standard and Business are pay-as-you-go with platform fees of 5.5% and 8%.
Developers use it to decide which model fits a feature before writing integration code. Prompt engineers can check how wording changes affect different models, and researchers can run quick informal evaluations without setting up separate accounts with each provider. Product teams on the Business plan get a larger workspace limit and advanced notifications, and enterprises can add SSO, contractual SLAs and managed policy enforcement. Hobbyists who just want to try free models will find the Free plan enough for casual testing.
Common scenarios include running the same coding question through several models to compare accuracy, testing a summarization prompt on cheap and premium models to see whether the extra cost is justified, and checking tone differences for customer-facing copy. Teams that later move to the API can use auto-routing and preferred vendor selection, activity logs with export, and budget controls to manage spend. Standard plans add prompt caching and a management API key, and Business adds EU and US in-region routing for data residency needs.
