What “OpenAI-compatible” means

An OpenAI-compatible API accepts the same request and response format as OpenAI's Chat Completions API. Any OpenAI SDK or tool can use it by changing the base URL and the API key, which is how one gateway can offer models from many companies behind one familiar interface.

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- base_url="https://api.openai.com/v1"
+ base_url="https://api.digitspace.ai/v1"
- api_key=OPENAI_API_KEY
+ api_key=DIGITSPACE_API_KEY

Same SDK, same calls. Every model.

What to check for

Feature	Why it matters
Streaming (server-sent events)	Chat interfaces and agents show text as it arrives
Tools (function calling)	Agents and structured actions depend on it
JSON schema output	Reliable structured data
Images in messages	Vision features
Usage in the response	Token counts for cost tracking

An engraving of a wall-mounted telephone transmitter from a 1906 telephone handbook. — From a 1906 handbook on telephone exchanges.
The practical telephone handbook and guide to the telephonic exchange, 1906. Internet Archive Book Images, no known copyright restrictions, via Wikimedia Commons.

And Anthropic-compatible

Anthropic's Messages API is the other common format, used by Claude Code and Anthropic's SDKs. DigitSpace accepts both, and translates between them, so a GPT model can be called through the Messages API and a Claude model through Chat Completions.

Questions

A telephone exchange room around 1900, with a long wooden switchboard, operator stools and a desk. — General Telephone Company of the Northwest, exchange room, about 1900, public domain, cropped, via Wikimedia Commons.

Do all models behave the same through it?

The format is the same; what each model supports differs. A router that knows each model's capabilities sends requests only where they'll work.

Is OpenAI's Responses API the same thing?

No, it's a newer, different format. DigitSpace serves Chat Completions and Messages today.

Live in a minute.

Create a key, change the base URL, send a request. No card needed with your own provider keys.

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