---
title: Claude Fable 5
url: https://platform.claude.com/docs/ja/models/fable-5/overview
description: Claude Fable 5 リファレンス：ライフサイクルステータス、すべてのプラットフォームでのモデルID、コンテキストウィンドウ、出力制限、価格、移行リソース。Claude Fable 5 はレガシーモデルであり、Claude Fable 5.1 が現在の Fable モデルです。
---
**Legacy.** Released June 9, 2026.
Although Claude Fable 5 is still available, you should consider migrating to Claude Fable 5.1. [See Claude Fable 5.1](https://platform.claude.com/docs/ja/models/fable-5-1/overview) · [Migrate to Claude Fable 5.1](https://platform.claude.com/docs/ja/models/fable-5-1/migration-guide#migrating-from-claude-fable-5-to-claude-fable-5-1)
Model ID: `claude-fable-5`
Context window: 1M tokens · Max output: 128K tokens · Input pricing: $10 / MTok · Output pricing: $50 / MTok
[Announcement](https://www.anthropic.com/news/claude-fable-5-mythos-5)
## Fable と Mythos の比較
[Claude Mythos 5](https://platform.claude.com/docs/ja/models/mythos-5/overview)は防御的サイバーセキュリティのワークフロー向けに別途提供されており、[Cyber Verification Program](https://support.claude.com/en/articles/14604842)などのAnthropicの検証プログラムを通じて検証された組織のみが利用できます。Claude Fable 5と同じ仕様および料金です。
## 現在のラインナップとの比較
| Model | Context | Max output | Price / MTok | Thinking | Default effort | Knowledge cutoff |
| :---------------------------------------------------------------------------------- | :------ | :--------- | :----------------- | :------------------- | :------------- | :--------------- |
| [Claude Fable 5.1](https://platform.claude.com/docs/ja/models/fable-5-1/overview) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jun 2026 |
| **Claude Fable 5** (this model) | 1M | 128K | $10 / $50 | Adaptive (always on) | `high` | Jan 2026 |
| [Claude Opus 5.5](https://platform.claude.com/docs/ja/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Adaptive (always on) | `medium` | Jun 2026 |
| [Claude Sonnet 5.5](https://platform.claude.com/docs/ja/models/sonnet-5-5/overview) | 1M | 128K | $2 / $10 | Adaptive | `high` | Jun 2026 |
| [Claude Haiku 5.5](https://platform.claude.com/docs/ja/models/haiku-5-5/overview) | 1M | 128K | From $0.10 / $0.50 | Adaptive | `medium` | Jun 2026 |
* **Context:** 1M tokens is roughly 555k words or 2.5M Unicode characters on the current tokenizer (introduced with Claude Opus 4.7); models before it fit about 750k words in 1M tokens. 200k tokens is roughly 150k words.
* **Max output:** Synchronous Messages API limit. On the Message Batches API, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Haiku 5.5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header.
* **Price / MTok:** Input / output, base price per million tokens. Batch API requests are 50% off; prompt caching reads cost 10% of the base input price (2.5% on Claude Fable 5.1 and Claude Mythos 5.1, 5% on Claude Opus 5.5 and Claude Sonnet 5.5). See Pricing for the full list.
* **Thinking:** Adaptive thinking lets the model decide how much to think, steered by effort. Extended thinking is the manual budget\_tokens mode on earlier models.
* **Default effort:** The effort parameter’s default on the Claude API. Models without a value don’t support the parameter.
* **Knowledge cutoff:** Reliable knowledge cutoff: the date through which the model’s knowledge is most extensive and reliable.
## 仕様
### Model IDs
| Platform | Model ID |
| :----------------------------------------------------------------------------------------------------- | :------------------------- |
| Claude API | `claude-fable-5` |
| [Amazon Bedrock](https://platform.claude.com/docs/ja/build-with-claude/claude-in-amazon-bedrock) | `anthropic.claude-fable-5` |
| [Google Cloud](https://platform.claude.com/docs/ja/build-with-claude/claude-on-vertex-ai) | `claude-fable-5` |
| [Microsoft Foundry](https://platform.claude.com/docs/ja/build-with-claude/claude-in-microsoft-foundry) | `claude-fable-5` |
| [Claude Platform on AWS](https://platform.claude.com/docs/ja/build-with-claude/claude-platform-on-aws) | `claude-fable-5` |
### Pricing
| Feature | Value |
| :------------------------------------------------------------------------------------- | :------------------------------- |
| Input | $10 / MTok |
| Output | $50 / MTok |
| [5m cache write](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $12.50 / MTok |
| [1h cache write](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $20 / MTok |
| [Cache read](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $1 / MTok |
| [Batch API](https://platform.claude.com/docs/ja/build-with-claude/batch-processing) | 50% discount on input and output |
[Full price list](https://platform.claude.com/docs/ja/about-claude/pricing)
### Capabilities
| Feature | Value |
| :-------------------------------------------------------------------------------------- | :--------------------- |
| [Context window](https://platform.claude.com/docs/ja/build-with-claude/context-windows) | 1M tokens |
| Max output | 128K tokens |
| [Thinking](https://platform.claude.com/docs/ja/build-with-claude/thinking) | Adaptive (always on) |
| [Default effort](https://platform.claude.com/docs/ja/build-with-claude/effort) | `high` |
| Input → output | Text and images → text |
| Reliable knowledge cutoff | Jan 2026 |
| Training data cutoff | Jan 2026 |
### Availability
| Feature | Value |
| :---------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Status](https://platform.claude.com/docs/ja/about-claude/model-deprecations) | Active (legacy) |
| Released | June 9, 2026 |
| Retirement | Not sooner than June 9, 2027 |
| Platforms | Claude API, [Amazon Bedrock](https://platform.claude.com/docs/ja/build-with-claude/claude-in-amazon-bedrock), [Google Cloud](https://platform.claude.com/docs/ja/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/ja/build-with-claude/claude-in-microsoft-foundry), [Claude Platform on AWS](https://platform.claude.com/docs/ja/build-with-claude/claude-platform-on-aws) |
## リソース
Claude Fable 5 から Claude Fable 5.1 へ移行する際の変更点。
現在の Fable モデル：概要、仕様、リソース。
Claude Fable 5 の機能、API の変更、提供状況。
長期的でエージェント的な作業のためのモデル固有のプロンプティングガイダンス。
分類器による拒否を処理し、`fallbacks` パラメータを使用して別の Claude モデルで再試行します。
## リファレンス
Claude Fable 5 が claude.ai および Claude アプリで使用するシステムプロンプト。
Claude Fable 5 と Claude Mythos 5 の安全性評価とデプロイメントの決定。
バッチ割引とプロンプトキャッシングのレートを含む完全な価格リスト。
モデルID、エイリアス、固定スナップショットの仕組み。
すべての Claude モデルのライフサイクルステータスと廃止に関するコミットメント。