faq.mdx

title	FAQ
description	Frequently asked questions about the Lightweight API.

Lightweight gives you access to **25+ models** from OpenAI, Anthropic, Google, and xAI — all through a single API key. This includes GPT-5.4, Claude Opus 4.6, Gemini 3.1 Pro, Grok, and many more.

Browse the full list on the [Models](/models) page or call `GET /v1/models` for the live catalog.

Yes — **100% OpenAI-compatible**. The primary endpoint is `POST /v1/chat/completions`, which follows the exact same request and response format as the OpenAI API.

Any tool, SDK, or library that works with OpenAI will work with Lightweight by simply changing the base URL and API key. No code changes, no wrapper libraries, no workaround flags.

You can check your token usage and remaining quota in two ways:

1. **API**: Call `GET /v1/usage` with your API key.
2. **Dashboard**: Visit the [Lightweight Dashboard](https://lightweight.one/dashboard) for a visual breakdown of your consumption.

```bash
curl https://api.lightweight.one/v1/usage \
  -H "Authorization: Bearer lw_sk_your-key-here"
```

You'll receive a `429 Too Many Requests` response. The response includes a `Retry-After` header that tells you exactly how many seconds to wait before retrying.

Rate limits are per API key and measured in requests per minute (RPM). See [Rate Limits](/rate-limits) for tier details.

Yes. Add `"stream": true` to your request body and the API will return server-sent events (SSE) — exactly like the OpenAI streaming format.

Streaming works with **every model** in the catalog, regardless of provider.

```bash
curl https://api.lightweight.one/v1/chat/completions \
  -H "Authorization: Bearer lw_sk_your-key-here" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4.5",
    "messages": [{"role": "user", "content": "Hello!"}],
    "stream": true
  }'
```

Lightweight is currently in **beta**. You can request access and get your API key from the [Dashboard](https://lightweight.one/dashboard).

Once approved, your key will start with `lw_sk_` and you can start making API calls immediately.