Comet
Use Opik to trace, evaluate, optimize, and monitor LLM applications and agents in development and production.
About Comet
Comet is an AI developer platform centered on Opik, its end-to-end observability system for LLM applications and agents. Teams record traces across retrieval, tool calls, model responses, and user feedback, then inspect individual runs to find failures. Opik also supports human annotation, test suites, more than 30 LLM-as-a-judge metrics, production monitoring, cost tracking, prompt optimization, and an agent that can propose code fixes from trace and evaluation results. It suits developers who need one workflow for testing before release and monitoring after deployment. A free cloud version lowers the cost of evaluation, while the open-source Opik repository provides another adoption path. Teams should still budget time to instrument applications, define useful evaluation criteria, review automated scores, and validate generated fixes before merging them. Comet also documents experiment tracking, custom visualizations, artifacts, model registry workflows, CI/CD webhooks, and deployment options that include VPC and on-premises environments for enterprise use.
Best for
Best use cases
Debug retrieval and tool-selection failures from recorded traces
Compare agent behavior with automated metrics and human review
Track production performance and model costs after deployment
Compare before choosing
Consider Comet when trace-driven code fixes matter to the workflow
Compare instrumentation effort and supported integrations with existing tooling
Confirm paid terms directly if the free cloud option will not cover the deployment
Features
Trace and debug agents
Log agent steps such as retrieval, tool selection, model output, and feedback, then inspect individual traces to locate failures.
Evaluate LLM behavior
Score traces with test suites, human review, and more than 30 LLM-as-a-judge metrics before and after release.
Optimize prompts and code
Run prompt optimization algorithms and use Ollie to turn trace and test results into proposed code changes with regression testing.
Pros
- The Free Cloud Version reduces upfront cost for teams testing LLM observability.
- Tracing, evaluation, prompt optimization, and production monitoring can share one workflow.
- VPC and on-premises options support enterprises with stricter deployment requirements.
Cons
- Teams must instrument applications before traces can explain agent behavior.
- Automated scores and proposed code fixes still require human review before production use.
- Paid plan prices require direct confirmation, which makes advance budget comparisons harder.
Pricing Plans
Free Cloud Version
- Cloud access to Opik
- LLM tracing and observability
- Evaluation and testing workflows
* Pricing information is for reference only. Please refer to the latest announcement on Comet's official website.