OpenAI API: REST or SDK

Can I call OpenAI Assistants APIs without using the provided SDKs? - API - OpenAI Developer Forum

Yes, there are official SDKs, non-official SDKS, and good old fashioned REST requests. There are even examples of making requests like throughout the OpenAI API documentation

openai/openai-python: The official Python library for the OpenAI API @GitHub

openai/openai-node: The official Node.js / Typescript library for the OpenAI API

openai/openai-go: The official Go library for the OpenAI API

openai/openai-dotnet: The official .NET library for the OpenAI API

openai/openai-openapi: OpenAPI specification for the OpenAI API

openai/openai-deno-build: Deno build of the official Typescript library for the OpenAI API.

openai/openai-cookbook: Examples and guides for using the OpenAI API

OpenAI Cookbook

OkGoDoIt/OpenAI-API-dotnet: An unofficial C#/.NET SDK for accessing the OpenAI GPT-3 API @GitHub