---
title: Claude Sonnet 5.5
url: https://platform.claude.com/docs/ja/models/sonnet-5-5/overview
description: Claude Sonnet 5.5の概要：用途、各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、料金、提供状況、およびこのモデルを使った構築のためのガイドとリソース。
---
**Latest.** Released September 28, 2026.
The best combination of speed and intelligence
Model ID: `claude-sonnet-5-5`
Context window: 1M tokens · Max output: 128K tokens · Input pricing: $2 / MTok · Output pricing: $10 / MTok
[Announcement](https://www.anthropic.com/claude-sonnet-5-5) · [What’s new](https://platform.claude.com/docs/ja/models/sonnet-5-5/whats-new-sonnet-5-5) · [Migration guide](https://platform.claude.com/docs/ja/models/sonnet-5-5/migration-guide)
## 概要
Claude Sonnet 5.5は、速度と知能の最良の組み合わせを提供します。コード生成、データ分析、コンテンツ作成、視覚的理解、エージェント型のツール使用など、日常的なコーディング、エージェント、エンタープライズのワークロード向けに構築されています。
## 比較
| Model | Context | Max output | Price / MTok | Latency | Thinking | Default effort | Knowledge cutoff |
| :-------------------------------------------------------------------------------- | :------ | :--------- | :----------------- | :------- | :------------------- | :------------- | :--------------- |
| [Claude Fable 5.2](https://platform.claude.com/docs/ja/models/fable-5-2/overview) | 1M | 128K | $8 / $40 | Moderate | Adaptive (always on) | `high` | Jun 2026 |
| [Claude Opus 5.5](https://platform.claude.com/docs/ja/models/opus-5-5/overview) | 1M | 128K | $4 / $20 | Moderate | Adaptive (always on) | `medium` | Jun 2026 |
| **Claude Sonnet 5.5** (this model) | 1M | 128K | $2 / $10 | Fast | 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 | Fastest | 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 5.2, Claude Mythos 5.2, 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.
* **Latency:** Comparative latency, relative to the current lineup, as published in the models overview. Actual latency depends on prompt length, output length, and thinking effort.
* **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-sonnet-5-5` |
| [Amazon Bedrock](https://platform.claude.com/docs/ja/build-with-claude/claude-in-amazon-bedrock) | `anthropic.claude-sonnet-5-5` |
| [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/ja/build-with-claude/claude-models-on-google-cloud/google-managed) | `claude-sonnet-5-5` |
| [Microsoft Foundry](https://platform.claude.com/docs/ja/build-with-claude/claude-in-microsoft-foundry) | `claude-sonnet-5-5` |
| [Claude Platform on AWS](https://platform.claude.com/docs/ja/build-with-claude/claude-platform-on-aws) | `claude-sonnet-5-5` |
| [Claude Models on Google Cloud (Anthropic managed)](https://platform.claude.com/docs/ja/build-with-claude/claude-models-on-google-cloud/anthropic-managed) | `claude-sonnet-5-5` |
### Pricing
| Feature | Value |
| :------------------------------------------------------------------------------------- | :------------------------------- |
| Input | $2 / MTok |
| Output | $10 / MTok |
| [5m cache write](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $2.50 / MTok |
| [1h cache write](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $4 / MTok |
| [Cache read](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $0.10 / 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 |
| [Max output (Batch API, beta)](https://platform.claude.com/docs/ja/build-with-claude/batch-processing#extended-output-beta) | 300K tokens |
| [Thinking](https://platform.claude.com/docs/ja/build-with-claude/thinking) | Adaptive |
| [Default effort](https://platform.claude.com/docs/ja/build-with-claude/effort) | `high` |
| Comparative latency | Fast |
| Input → output | Text and images → text |
| Reliable knowledge cutoff | Jun 2026 |
| Training data cutoff | Jun 2026 |
### Availability
| Feature | Value |
| :---------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Status](https://platform.claude.com/docs/ja/about-claude/model-deprecations) | Active (latest) |
| Released | September 28, 2026 |
| Retirement | Not sooner than September 28, 2027 |
| Platforms | Claude API, [Amazon Bedrock](https://platform.claude.com/docs/ja/build-with-claude/claude-in-amazon-bedrock), [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/ja/build-with-claude/claude-models-on-google-cloud/google-managed), [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), [Claude Models on Google Cloud (Anthropic managed)](https://platform.claude.com/docs/ja/build-with-claude/claude-models-on-google-cloud/anthropic-managed) |
## 知っておくべきこと
* 「adaptive thinking」（適応型思考）はデフォルトで有効になっています。最も低い思考設定は`between_tools`で、これにより事前の思考がオフになります。これは`high`以下のeffortで機能します。[Claude Sonnet 5.5の新機能](https://platform.claude.com/docs/ja/models/sonnet-5-5/whats-new-sonnet-5-5#turn-off-up-front-thinking)を参照してください。
* `temperature`、`top_p`、または`top_k`を設定すると、400エラーが返されます。
* キャッシュ可能なプロンプトの最小長は512トークンです。[プロンプトキャッシング](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching#cache-limitations)を参照してください。
* [Message Batches API](https://platform.claude.com/docs/ja/build-with-claude/batch-processing#extended-output-beta)では、Claude Sonnet 5.5は`output-300k-2026-03-24`ベータヘッダーを使用することで最大300kの出力トークンをサポートします。
* [Models API](https://platform.claude.com/docs/ja/api/models/list)を使用して、制限と機能をプログラムで照会できます。
## リソース
Claude Sonnet 5.5に固有の動作の違いとプロンプトのパターン。
思考の深さ、レイテンシ、コストを制御する設定です。ワークロードごとにレベルを選択してください。
適応型思考の仕組み、各モデルが受け付ける思考設定、および思考ブロックの保持方法。
## リファレンス
Claude Sonnet 5.5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 Sonnet 5.5の安全性評価とデプロイに関する決定事項。
バッチ割引やプロンプトキャッシングの料金を含む完全な料金表。
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確約事項。