---
title: "System One pricing"
description: "Prepaid credit packs and billing guidance."
canonical: "https://system-one.dev/ja/pricing"
language: "ja"
---

# System One pricing

Prepaid credit packs and billing guidance.

Credits are prepaid and shared by an account. A credit is a billing unit, not a token. Checkout availability depends on the payment configuration; purchased credits become available after payment is confirmed.

New accounts get 100 free credits on sign-up.

## Available credit packs

| Pack | Price | Credits | Included |
| --- | --- | --- | --- |
| Starter | 5.99 USD | 5000 | Choice・Score・Noul; SDK と Playground 利用; 失敗した推論はクレジット返却; 自動更新なし |
| Builder | 19.99 USD | 20000 | Choice・Score・Noul; SDK と Playground 利用; 失敗した推論はクレジット返却; 自動更新なし |
| Scale | 99.99 USD | 120000 | Choice・Score・Noul; SDK と Playground 利用; 失敗した推論はクレジット返却; 自動更新なし |
## Failure and retry accounting

Credits are reserved before inference and returned on a recorded failed inference. A successful replay using the same Idempotency-Key and body incurs no new inference or debit while its replay record remains available. Different input with the same key is rejected. After a timeout or uncertain result, check recorded usage before retrying and preserve the key. Reconciliation can be pending; do not assume a refund until the recorded outcome confirms it.

## Start here

- [Developer documentation](https://docs.system-one.dev/ja)
- [Versioning and deprecation](https://docs.system-one.dev/ja/docs/api/versioning)
- [冪等性とリトライ](https://docs.system-one.dev/ja/docs/api/idempotency)
- [API エラー](https://docs.system-one.dev/ja/docs/api/errors)
- [TypeScript SDK](https://system-one.dev/ja/sdk)
- [API reference](https://system-one.dev/ja/api)
- [Models](https://system-one.dev/ja/models)
- [モデルカタログ](https://docs.system-one.dev/ja/docs/models)
- [Authentication](https://system-one.dev/ja/auth.md)
- [Pricing](https://system-one.dev/ja/pricing)
- [クレジット課金](https://docs.system-one.dev/ja/docs/billing)
- [OpenAPI specification](https://system-one.dev/openapi.json)
- [Agent integration guide](https://system-one.dev/ja/skill.md)
- [System One for Coding Agents: Cursor, Claude Code, Codex](https://docs.system-one.dev/ja/docs/coding-agents)
- [Installable coding-agent skill](https://system-one.dev/skills/system-one/SKILL.md)
- [About](https://system-one.dev/ja/about)
- [Contact](https://system-one.dev/ja/contact)
- [Playground samples](https://system-one.dev/ja/demo)
- [ブログ](https://system-one.dev/ja/blog)
- [SDK source](https://github.com/ziyu/system-one-sdk)
- [@system-one-ai/core (npm)](https://www.npmjs.com/package/@system-one-ai/core)