Most hosted chatbot platforms charge per message or per conversation on top of whatever the model itself costs. The markup is sometimes 2x, sometimes 5x, and it is always hidden behind seat licenses and credit bundles that make direct comparison hard. A site that pays $50 a month for the platform plus its own model usage often ends up at $300 once volume picks up, with little control over what part of the bill is model and what part is platform tax.

SleekAI is a WordPress plugin, not a service. You paste your OpenAI, Anthropic, Google, or OpenRouter API key into the settings page once. From then on, every chat turn sends a request directly from your server to the provider you chose. The model vendor bills you directly for tokens used. SleekAI is paid once for the license and never takes a cut of inference. Your token budget is whatever your provider account is set to, not whatever a credit-bundle reseller decides to limit you at.

Generic platforms argue that bundling tokens simplifies billing. In practice it removes visibility and limits choice. With BYOK you can run a cheap Gemini Flash bot on a high-volume FAQ and an expensive Claude Opus bot on a complex sales flow, pay exactly what each consumes, and switch providers in seconds without the platform telling you which models are 'supported' on your plan tier.

Hosted chat platforms made sense when frontier APIs were hard to integrate and inference was expensive enough that bundling felt like a discount. Neither is true anymore. OpenAI, Anthropic, and Google APIs are straightforward to call from any server with an HTTP client, and direct provider pricing has dropped to fractions of a cent per typical chat turn.

The economic case for paying a platform 2-5x markup on top of the model itself has eroded. What remains is the convenience argument, and that argument falls apart at any meaningful scale. The other dimension is control.

With BYOK, the model vendor relationship is yours directly. Their data handling, retention, and abuse policies apply to you on their terms, with no platform intermediary adding a fourth party to the data flow. If a vendor releases a better model or cuts prices on an existing one, you switch immediately by changing a dropdown.

If you want to A/B test two providers on the same prompt, both keys are already there. If you need to comply with data residency rules, you pick the provider whose regions match and there is no platform layer to negotiate with. The whole stack collapses to two parties, your server and the model vendor, which is the simplest architecture that can possibly work.