Question: Can you recommend a chat API that's a cost-effective alternative to ChatGPT and offers customizable AI models?

If you're looking for a cheaper alternative to ChatGPT with the ability to train your own AI models, CustomGPT is a good option. The service uses GPT-4 technology to build custom chatbots that can be fine-tuned for your business needs, so it's a good option for customer service and document search. It can be deployed in different ways and has different pricing tiers, including a Standard plan for $89/month/year and a Premium plan for $449/month/year, with an Enterprise option for custom data and query capacity pricing.

Another option worth considering is Mendable, which offers an AI platform for building AI chat apps that can help with customer support and sales enablement. Mendable offers a lot of customization options, including the ability to change base model properties, support multiple models and continuous training. It also offers a free plan with 500 message credits per month and custom enterprise plans based on message usage, so it's a good option if you want a lot of flexibility and don't need to pay for a lot of messages.

For developers who want access to a wide range of AI models, AIML API offers more than 100 AI models through a single API. It's designed for scalability, reliability and cost effectiveness with a simple pricing model based on token usage. It supports serverless inference and integrates with OpenAI, so it's a good option for advanced machine learning projects that require fast and reliable AI access.

Last, SiteGPT offers a customized AI-powered chatbot service that automates customer support. It can handle multiple languages, can be trained with data from different sources, and integrates with tools like Crisp, Intercom and Zendesk. SiteGPT's flexible pricing starts at $49 per month and goes up to $999 per month depending on the features and message limits you need.