Phoenix
Phoenix is an open-source platform designed for evaluating, experimenting with, and optimizing AI products, specifically Large Language Models (LLMs).
Our verdict
Who it's for
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
Who should look elsewhere
Advanced features like dedicated support and custom data limits are only available in higher-tier paid plans.
Pros
- +Open-source and self-hostable, offering flexibility and no vendor lock-in.
- +Provides deep observability into LLM behavior and decision-making.
- +Facilitates rapid experimentation and iteration with interactive playgrounds.
- +Supports both automated and human feedback for comprehensive evaluations.
- +Strong community support and integrations with popular LLM frameworks.
Cons
- −Advanced features like dedicated support and custom data limits are only available in higher-tier paid plans.
- −The free SaaS tier has limited trace spans and ingestion volume.
- −Requires some technical expertise for self-hosting and full utilization.
Key features
- ✓OpenTelemetry (OTEL) for seamless setup and data collection
- ✓Application tracing for total visibility into LLM app data
- ✓Interactive prompt playground for prompt and model iteration
- ✓Streamlined evaluation and annotation library with pre-built templates
- ✓Dataset clustering and visualization using embeddings
- ✓Self-hostable with no feature gates or restrictions
- ✓Integration with various LLM tools and frameworks
- ✓Online and offline evaluations, including LLM as judge and code evals
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Phoenix Small teams and smaller data | — | month | Trace spans user managed; Ingestion volume user managed; Projects user managed |
| AX Free | — | month | 25k trace spans per month; 1 GB ingestion volume per month; 7 days retention |
| AX Pro | $50 | month | 50k trace spans per month; 10 GB ingestion volume per month; 15 days retention |
| AX Enterprise | — | month | Custom trace spans; Custom ingestion volume; Custom projects |
Integrations
Slack