Ship AI agents that actually work in production.

The evaluation API built for agents, tool calling, and RAG. LLM as a judge doesn't score reliably, Composo does.

Agents can't work without deterministic evals

Everyone's trying to build agents. But they keep breaking in production - tool calls fail, outputs hallucinate, and LLM-as-judge can't catch any of it.

The evaluation layer designed for the agentic era

Purpose-built for agents, tool calling, and RAG. Not another LLM-as-judge wrapper - actual deterministic evaluation models trained specifically for the complexities of production AI.

Test & iterate faster in development

Debug agent failures and hallucinations in minutes. Know exactly which tool calls break and which outputs hallucinate.

Ship with 100% confidence

Deploy agents knowing they won't randomly fail or hallucinate. Catch errors before customers do.

Make agents work, not just demo

Bridge the gap between 'cool demo' and 'production-ready.' Fix tool calling errors and accuracy issues that matter.

Why companies choose Composo

5 mins to set up

Drop-in replacement for LLM-as-judge. Works instantly for agents and tool calling where others fail.

Enterprise-ready from day one

Built for enterprise-scale teams, with robust compliance and secure integration into your stack.

Where LLM-as-judge fails

92% accuracy vs 72% for LLM judges. Catches hallucinations and tool calling errors others miss.

Agents can't work without this

The difference between 90% accuracy (fine for chat) and 99.9% (required for agents) is everything.

Industry leading research

First to solve deterministic evaluation for tool calling. Zero hallucinations tolerance.

Fully customisable

Single-sentence custom criteria for any domain. Medical, legal, financial - we handle complexity.

We're trusted by the best teams in AI

Proven results across startups & enterprises in the most complex verticals

"We were finding LLM as a Judge far too unreliable - the same response would score 40% one day and 70% the next. Composo gave us the deterministic scoring we needed to actually track improvements. Game changer for our ML team."

Senior ML Engineer

Fortune 500 Financial Services

"This is awesome. We replaced our entire LLM-as-judge system in one afternoon. We just run all our outputs through Composo and get super powerful metrics on performance. Why would anyone do it the old way?"

CTO

Series B Healthcare AI Startup

"Our enterprise clients demand quantitative proof that our AI agents are accurate. Composo's 92% accuracy finally gave us the hard metrics we needed to prove our system delivers on its promises."

VP of Product

Legal Tech Company

"We cut our QA cycle time by 70%. Instead of relying purely on human review, now we instantly know which prompts are failing and why. The detailed analysis helps us fix issues before they hit production."

Head of AI Engineering

Enterprise SaaS platform