# Introduction

# Hyphen Developers

**Hyphen is one key for every frontier model, behind one base URL.**

Point any OpenAI- or Anthropic-compatible tool at the Hyphen gateway, drop in
your key, and you are done. No juggling provider accounts, no per-provider
billing, no surprise overage — just a short list of models and a monthly cap you
control.

```
Base URL   https://api.hyphen-solution.com
Auth       Authorization: Bearer sk-hy-...
Models     m2.5 · m2.7 · m3 · text
Console    https://app.hyphen-solution.com
```

:::note[One base URL, one key]
Every endpoint — Chat Completions, Responses, Anthropic Messages, embeddings —
is served from the **same base URL** and authenticated with the **same key**.
:::

## Why it works everywhere

Under the hood the gateway is an OpenAI-compatible proxy. It speaks three wire
formats so your tools don't have to care what runs upstream:

| Endpoint                    | Wire format             | Used by |
| --------------------------- | ----------------------- | ------- |
| `POST /v1/chat/completions` | OpenAI Chat Completions | The default surface — OpenAI SDK, Cursor, Cline, Aider, Continue, Hermes |
| `POST /v1/responses`        | OpenAI Responses API    | **Codex CLI** |
| `POST /v1/messages`         | Anthropic Messages API  | **Claude Code** |
| `GET  /v1/models`           | Model discovery         | Any client |
| `POST /v1/embeddings`       | OpenAI Embeddings       | RAG / search |

Because the gateway **translates between these formats**, a tool that only
speaks the Responses API (Codex) or only speaks Anthropic Messages (Claude Code)
can still reach the same upstream models as everything else.

## The models

Hyphen serves four models. Reach for them by tier:

| Model  | Reach for it when…                                     |
| ------ | ------------------------------------------------------ |
| `m2.5` | Fast and cheap — high-volume, low-latency calls        |
| `m2.7` | Balanced default for day-to-day agent work             |
| `m3`   | Strongest reasoning — hard refactors, deep planning    |
| `text` | Plain text completion                                  |

Prefer a stable name? Three aliases map onto the models above and keep working
as the mapping is upgraded: `hyphen-fast` = `m2.5`, `hyphen-sonnet` = `m2.7`,
`hyphen-opus` = `m3`. Full detail on the [Models](/models) page.

## One key, one cap

Each key carries a **monthly USD budget**. When it is spent, requests return
**HTTP 429** with the reset date — nothing runs over budget by accident. Credits
can extend a key past its cap. See [Rate limits & caps](/rate-limits).

## Next steps

- **[Quickstart](/quickstart)** — get a key and make your first request in three
  steps.
- **[Models](/models)** — the full model list and how to pick one.
- **[Connect your coding agent](/agents/claude-code)** — Claude Code, Codex CLI,
  Hermes, OpenClaw, and more.
- **[API Reference](/api)** — the full interactive spec.