LastMile AI

Built for teams shipping GenAI features, LastMile AI is a full-stack developer platform for debugging, evaluating and improving AI applications.

Its main job is evaluation: you can fine-tune custom evaluator models, so the scoring reflects what your own application is supposed to do rather than a generic benchmark.

The selling point is to make GenAI development more science than art, and the evaluation tooling targets RAG pipelines and multi-agent applications specifically.

Beyond scoring, LastMile AI covers several other jobs around an AI app.

You can generate synthetic data, manage experiments, and run evaluations in real time with fast inference.

Online guardrails watch an application in production, which helps with continuous monitoring and risk mitigation.

The platform also supports deploying AI securely and tracks application performance over time.

This AI developer tool sits closest to testing and monitoring, so it suits engineers who already have an LLM app running and need a way to measure whether changes make it better or worse.

Pricing is not something to assume, so check the website before planning around it.