Companies that use open ai's gpt in their product

Relevance AI supports multiple large language models (LLMs) including OpenAI, indicating that they integrate OpenAI's GPT technology into their product or service. The use of OpenAI's GPT technology appears to be a core feature of the company's product, as they offer custom actions for GPTs and the ability to build and deploy AI chains and agents powered by LLM prompts.

VIER develops VIER Smart Dialog, a ChatGPT voicebot for more efficient phone customer service, which indicates the integration of OpenAI's GPT technology into their product.

Alistair Pullen, a contributor at Cosine, authored a blog post titled 'I got early access to ChatGPT API and then pushed it to its limits. Here’s what you need to know' on March 1, 2023, indicating the company uses OpenAI's GPT technology in their product.