Why is OpenAI capitalised and works in the beginner tutorial

API
2

“openai” is the name of the library package.

“OpenAI” for the client object class, and others that are capitalized, are python classes.

__init__.py:

from ._utils import file_from_path
from ._client import (
    Client,
    OpenAI,
    Stream,
    Timeout,
    Transport,
    AsyncClient,
    AsyncOpenAI,
    AsyncStream,
    RequestOptions,
)
from ._version import __title__, __version__
...

_client:

class OpenAI(SyncAPIClient):
    completions: resources.Completions
    chat: resources.Chat
    edits: resources.Edits
    embeddings: resources.Embeddings
    files: resources.Files
    images: resources.Images
    audio: resources.Audio
    moderations: resources.Moderations
    models: resources.Models
    fine_tuning: resources.FineTuning
    fine_tunes: resources.FineTunes
    beta: resources.Beta
    with_raw_response: OpenAIWithRawResponse

etc…

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