Sreenivas Sadhu
Ship AI features with confidence. Trace every call, catch every regression.
LLM Eval & Trace logs every model call, traces multi-step agents, and runs regression evals when you change a prompt — so you never ship a silent quality drop.
Observability and evals built for LLM apps
Full call tracing
Capture every LLM request and response — prompt, parameters, completion, and metadata — with structured logging you can search and replay.
Multi-step agent timelines
Follow tool calls, retries, and nested chains across a single agent run in one waterfall view, so you can pinpoint exactly where a run went wrong.
Regression eval suites
Run automated evals on every prompt change and block deploys that drop accuracy — catch quality regressions before your users do.
Side-by-side prompt diffing
Compare two prompt versions on the same inputs and see outputs, scores, and token deltas side by side before you promote a change.
Latency & token metrics
Track p50/p95 latency, token usage, and cost per model, route, and endpoint to spot slow calls and runaway spend early.
Quality-drop alerts
Get notified the moment eval scores, error rates, or latency cross your thresholds — no more silent quality drops in production.
Frequently asked questions
What is LLM Eval & Trace?
LLM Eval & Trace is an observability and evaluation tool for AI apps. It logs every model call, traces multi-step agents end to end, and runs regression evals when you change a prompt, giving developers full visibility into LLM behavior in production.
Which model providers does it support?
It works with Claude (Anthropic), OpenAI, and any HTTP-based LLM. Point your calls through the SDK or proxy and traces, metrics, and evals flow in automatically — regardless of provider.
How do regression evals work?
Define a suite of test inputs with expected criteria or graders. Every time you change a prompt or model, LLM Eval & Trace re-runs the suite, scores the outputs, and diffs them against your baseline so a regression fails the check instead of shipping silently.
Is there a free tier?
Yes. You can start tracing and running evals for free — no credit card required. Paid plans add higher volume, longer retention, and team features as you scale.
Start tracing free
Instrument your first LLM call in minutes. Free to start — no credit card required.