Overview

Features

• Phoenix Client - Lightweight client for interacting with the Phoenix server via its OpenAPI REST interface

  • Datasets - Create and manage datasets for experimentation

  • Experiments - Run experiments and evaluate model performance

  • Prompts - Manage prompt templates and versions

  • Spans - Access and analyze traces and spans

  • Annotations - Add annotations, evals, and feedback to spans

  • Sessions - Add session annotations to multi-turn conversations and threads

  • Projects - Organize your work with project management

• Phoenix Evals - Tooling to evaluate LLM applications including RAG relevance, answer relevance, and more

• Phoenix OTEL - Provides a lightweight wrapper around OpenTelemetry primitives with Phoenix-aware defaults

Installation

Install via pip.

pip install -Uq arize-phoenix-client

Usage

from phoenix.client import Client

client = Client(base_url="your-server-url")  # base_url defaults to http://localhost:6006

Authentication (if applicable)

Phoenix API key can be an environment variable...

import os

os.environ["PHOENIX_API_KEY"] = "your-api-key"

...or passed directly to the client.

from phoenix.client import Client

client = Client(api_key="your-api-key")

Custom Headers

By default, the Phoenix client will use the bearer authentication scheme in the HTTP headers, but if you need different headers, e.g. for Phoenix Cloud, they can also be customized via an environment variable...

import os

os.environ["PHOENIX_CLIENT_HEADERS"] = "api-key=your-api-key,"  # use `api-key` for Phoenix Cloud

...or passed directly to the client.

from phoenix.client import Client

client = Client(headers={"api-key": "your-api-key"})  # use `api-key` for Phoenix Cloud

Prompt Management

With the Phoenix client, you can push and pull prompts to and from your Phoenix server.

from phoenix.client import Client
from phoenix.client.types import PromptVersion

# Change base_url to your Phoenix server URL
base_url = "http://localhost:6006"
client = Client(base_url=base_url)

# prompt identifier consists of alphanumeric characters, hyphens or underscores
prompt_identifier = "haiku-writer"

content = "Write a haiku about {{topic}}"
prompt = client.prompts.create(
    name=prompt_identifier,
    version=PromptVersion(
        [{"role": "user", "content": content}],
        model_name="gpt-4o-mini",
    ),
)

The client can retrieve a prompt by its name.

prompt = client.prompts.get(prompt_identifier=prompt_identifier)

The prompt can be used to generate completions.

from openai import OpenAI

variables = {"topic": "programming"}
resp = OpenAI().chat.completions.create(**prompt.format(variables=variables))
print(resp.choices[0].message.content)

To learn more about prompt engineering using Phenix, see the Phoenix documentation.

Project Management

The Phoenix client provides synchronous and asynchronous interfaces for interacting with Phoenix Projects.

Key Features

• Get a project by ID or name

• List all projects

• Create a new project with optional description

• Update a project’s description (note: names cannot be changed)

• Delete a project by ID or name

Usage Examples

from phoenix.client import Client
client = Client(base_url="your-server-url")

# List all projects
projects = client.projects.list()

# Get a project by ID or name
project = client.projects.get(project_id="UHJvamVjdDoy")
project = client.projects.get(project_name="My Project")

# Create a project
new_project = client.projects.create(
    name="New Project",
    description="This is a new project"
)

# Update a project
updated_project = client.projects.update(
    project_id="UHJvamVjdDoy",
    description="Updated description"
)

# Delete a project
client.projects.delete(project_name="My Project")