Principle:Togethercomputer Together python Client Initialization

Attribute	Value
Principle Name	Client_Initialization
Overview	Mechanism for creating authenticated API client instances that provide access to all Together AI services.
Domain	NLP, API_Client, Inference
Repository	togethercomputer/together-python
Last Updated	2026-02-15 16:00 GMT

Description

Client initialization is the process of creating a configured API client that manages authentication, base URL routing, timeout settings, and retry policies. The Together SDK provides both synchronous (Together) and asynchronous (AsyncTogether) client variants that share the same constructor signature and configuration semantics.

The client object serves as the single entry point for all Together AI API interactions. Once initialized, it exposes namespaced resource attributes (such as .chat, .completions, .embeddings, .images, and others) that encapsulate the HTTP request logic for each API capability.

Authentication is resolved through a fallback chain:

An explicit api_key keyword argument takes highest priority.
If not provided, the TOGETHER_API_KEY environment variable is checked.
In Google Colab environments, the Colab secrets manager is queried as a final fallback.
If no API key can be resolved, an AuthenticationError is raised immediately.

The base URL, timeout, and retry settings follow a similar pattern of explicit argument taking priority over environment variable fallback, with sensible defaults applied when neither is specified.

Usage

Use client initialization when starting any interaction with Together AI services. It is the required first step before making any API call, including chat completions, embeddings, image generation, file management, fine-tuning, and model listing.

When to use:

At application startup to create a shared client instance
When switching between different API keys or base URLs
When configuring custom timeout or retry behavior for specific workloads
When using async frameworks that require the AsyncTogether variant

When not to use:

Do not create a new client for every API call; reuse a single client instance throughout the application lifetime
Do not use AsyncTogether in synchronous code paths (and vice versa)

Theoretical Basis

The client follows the resource composition pattern -- a single entry point object that eagerly initializes namespaced resource objects for each API capability. Each resource (e.g., chat, completions, embeddings) is a dedicated class that receives the shared TogetherClient configuration object containing authentication credentials, base URL, timeout, and retry settings.

This pattern provides several advantages:

Single point of configuration: All API calls inherit the same authentication and transport settings.
Discoverability: IDE autocompletion on the client object reveals all available API capabilities.
Testability: A single mock or stub of the client can intercept all API calls.

The fallback chain for API key resolution (explicit argument, environment variable, platform secret) follows the principle of least surprise, matching the conventions established by the OpenAI Python SDK and similar API clients.

Knowledge Sources

Source	Type	URI
Together AI API Documentation	Doc	Together AI Quickstart
Together AI API Keys	Doc	Together AI Authentication

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