SynapseX Documentation

SynapseX is an AI platform from SoftQuantus. It gives you first-party SynapseX large language models through four surfaces — a browser chat app, a desktop coding agent, a terminal CLI, and an OpenAI-compatible API you can call from your own applications. Pick the surface that matches your job, sign in once on that surface, and you are working.

Not sure which one you want? Read Which SynapseX surface should you use? — it takes about a minute.

Start here in 60 seconds

Three entry points, depending on what you want to do first.

Chat in the browser. Open chat.synapsex.ai and choose Continue with Google. An account is required before your first message. Full walkthrough: Start with SynapseX Chat.
Put the agent in your terminal. On macOS or Linux, run:
```
curl -fsSL https://synapsex.ai/install.sh | sh
```
This installs a binary called synapsex-code. Windows and the rest of the setup: Start with SynapseX CLI.
Call the API from your code. Create an account and an API key at platform.synapsex.ai , add credits, then POST to /api/v1/chat/completions. Full walkthrough: Start with the Platform API.

Try SynapseX with no account and no key

This is a public endpoint. Run it now:


curl -s https://chat.synapsex.ai/api/models

It returns the six SynapseX models you can select in SynapseX Chat — Atlas, Forge, Vault, Nexus, Oracle and Quasar — each with its context window and its per-million-token price. The first entry looks like this (real response, abbreviated — each entry carries more fields than are shown here):


{
  "models": [
    {
      "id": "synapsex:synapsex-atlas-7b-v1",
      "name": "SynapseX Atlas",
      "provider": "SynapseX",
      "description": "Compact, fast model for general tasks and high volume.",
      "contextWindow": 128000,
      "inputCost": 0.1,
      "outputCost": 0.4,
      "priceUnit": "per 1M tokens"
    }
  ]
}

What each model is for: Chat models.

The four SynapseX surfaces

Ask questions in the browser, with file attachments, voice input, memory across conversations and Turbo. Nothing to install.

SynapseX Chat

A local AI coding agent that opens your own project folder, edits your files and runs commands on your machine.

SynapseX Desktop

The same agent in your terminal as synapsex-code, plus a quantum circuit simulator that runs offline with no account.

SynapseX CLI

OpenAI-compatible chat completions at platform.synapsex.ai, for your own applications and services.

Platform API

Two products, two accounts

chat.synapsex.ai and platform.synapsex.ai are billed and authenticated separately. They do not share an account, a key or a balance.

chat.synapsex.ai — subscription plans, and personal API keys that start with sxc_. These keys connect SynapseX Desktop and the CLI to your chat account.
platform.synapsex.ai — prepaid credits, and workspace API keys that start with sk-synapsex-. These keys call the OpenAI-compatible API.

A chat subscription grants nothing on the API platform, and API credits grant nothing in chat. Every difference in one table: Two products, two accounts.

Browse the documentation

The tree is split along the product boundary above, so a page never mixes the two. Every page outside the shared entrance carries a banner naming the account it applies to.

Shared entrance — both products

Section	What you will find
Getting started	One quickstart per surface, from zero to a first working result.
Concepts	How SynapseX fits together, the two accounts, device login, key formats and scopes.

SynapseX apps — your chat.synapsex.ai account

Section	What you will find
SynapseX Chat	Models, conversations, files, voice, Turbo, memory, limits and errors.
SynapseX Desktop	Install, sign in, open a project, and control what the agent is allowed to do.
SynapseX CLI	Install, authenticate, the terminal agent, the offline quantum simulator, MCP.
Your account	Chat plans, personal `sxc_` keys, exporting and deleting your data.
Apps reference	CLI commands and configuration, Desktop reference, shortcuts, downloads.

Platform API — your platform.synapsex.ai account

Section	What you will find
Platform API	Authentication, chat completions, models and pricing, OpenAI compatibility, errors, Python SDK, cookbooks.
Workspaces, keys and credits	Create a workspace, mint `sk-synapsex-` keys, buy credits and cap spend.

About SynapseX and SoftQuantus

SynapseX is built by SoftQuantus. Related sites:

synapsex.ai — product site and downloads
chat.synapsex.ai — SynapseX Chat
platform.synapsex.ai — API platform console
softquantus.com — SoftQuantus