Question: I need a solution that integrates with popular LLM providers and allows for easy customization and fine-tuning of models.

If you're looking for a service that integrates with mainstream LLM providers and lets you customize and fine-tune models easily, Humanloop is a good option. The service is designed to oversee and optimize LLM app development, with tools for prompt management, testing, and model tuning. It supports mainstream providers and offers SDKs in Python and TypeScript to make integration easy. Humanloop also offers a free tier for prototyping and an enterprise tier for broader use with more features.

Another option is PROMPTMETHEUS, an integrated service for writing, testing, optimizing and deploying one-shot prompts. It supports more than 80 LLMs from multiple providers, with a prompt toolbox and features like composability, cost estimation and data export. It also can be integrated with third-party services like Notion, Zapier and Airtable.

Predibase is another option, in particular if you're looking for a low-cost option to fine-tune and serve LLMs. It offers free serverless inference and enterprise-grade security, supports a broad range of models and uses a pay-as-you-go pricing model. That makes it a good option for teams that want a scalable and efficient solution.

And if you're a team that needs an experimentation and human annotation platform, Parea offers a broad suite of tools. It includes experiment tracking, observability, human annotation and prompt playground tools. Parea supports mainstream LLM providers and offers several pricing tiers, including a free Builder plan and an Enterprise plan for larger teams.