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Sylphx

Sylphx AIPreview

One API for frontier models, in the OpenAI and Anthropic formats.

Part of Sylphx: the same account, the same key, and the same bill as every other service. In the same league as OpenRouter.

Start with Sylphx AIRead the docs

What Sylphx AI does

  • The formats you already use

    Responses, Chat Completions, and Anthropic Messages on api.sylphx.com, with streaming, tools, and stored responses.

  • The model you asked for

    A request for a model is served by that model. The catalog lists the newest stable release of each line, with its price.

  • Prompt caching

    Cached input is reported and priced at the model’s cached-input list price.

  • Hosted web search, fetch, and tool search run inside the request.

Quickstart

Your first call

Install the SDK, set SYLPHX_API_KEY to a key from the console, and call the API. The CLI speaks the same API.

index.ts
import { Sylphx } from '@sylphx/sdk'

// Reads SYLPHX_API_KEY: one key for every Sylphx service.
const sylphx = new Sylphx()

for await (const item of sylphx.ai.aiModels.listAll({})) {
  console.log(item.name)
}
Install
npm install @sylphx/sdk
CLI
sylphx ai ai-models list

Pricing

Pay for what you use

Start free. Pro is $20 a month and includes $20 of usage across every service; usage past it bills at the prices below, up to your spend cap.

Each model is priced per token at its list price, shown in the model catalog in the console.

Every service’s prices