New — real-time speech-to-text. Read the docs.

One key. Every model your product needs.

Chat, vision, speech, translation and retrieval behind a single OpenAI-compatible endpoint, running on GPU hardware we operate ourselves.

No credit card needed to try the Playground.

POST /v1/chat/completions
curl https://api.larsa.larsima.com/v1/chat/completions \
  -H "Authorization: Bearer $LARSA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "larsa-general",
    "messages": [
      {"role": "user", "content": "Summarize this clause in plain language."}
    ]
  }'
Migration

Drop-in compatible

If your code already calls the OpenAI SDK, it already calls Larsa. Change one string and keep everything else.

  • The same request and response shapes, the same error format, the same streaming protocol.
  • Every official OpenAI SDK works unmodified — Python, Node, or anything built on the plain REST API.
  • Nothing else in your code has to know it is talking to different hardware.
Python
client = OpenAI(api_key=LARSA_API_KEY,
    base_url="https://api.larsa.larsima.com/v1")
Build agents

The pieces an agent needs

Paid add-ons for the parts of a product that go past a single chat call.

Skills

Paid

Package a workflow once — a form-filler, a document drafter — and call it like any other model.

MCP servers

Paid

Connect Model Context Protocol servers so a request can read and act on tools you already run.

Knowledge bases

Paid

Upload your own documents once per customer; any chat call can retrieve from them.

Function calling

Paid

Describe your functions and the model decides when to call them, in the same shape as OpenAI's.

Web search

Paid

Let a chat call reach past its training data and cite what it found.

Everywhere it ships

Fluent where the work is

The models read English, Persian and Spanish best — the languages the legal corpora are written in. The console around them speaks 96 languages, seven of them right-to-left, so the interface is never the part that struggles.

Questions

Frequently asked

Start building on Larsa

Create an account and get an API key in under a minute.