---
title: Claude Opus 4.5
url: https://platform.claude.com/docs/ja/models/opus-4-5/overview
description: Claude Opus 4.5のリファレンス：ライフサイクルステータス、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、および移行リソース。Claude Opus 4.5はレガシーモデルであり、Claude Opus 5.5が現在のOpusモデルです。
---
**Legacy.** Released November 24, 2025.
Although Claude Opus 4.5 is still available, you should consider migrating to Claude Opus 5.5. [See Claude Opus 5.5](https://platform.claude.com/docs/ja/models/opus-5-5/overview) · [Migrate to Claude Opus 5.5](https://platform.claude.com/docs/ja/models/opus-5-5/migration-guide#migrating-from-claude-opus-45)
Model ID: `claude-opus-4-5-20251101`
Context window: 200K tokens · Max output: 64K tokens · Input pricing: $5 / MTok · Output pricing: $25 / MTok
[Announcement](https://www.anthropic.com/news/claude-opus-4-5)
## 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 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 Opus 4.5** (this model) | 200K | 64K | $5 / $25 | Extended | `high` | May 2025 |
| [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-opus-4-5-20251101` |
| Claude API alias | `claude-opus-4-5` |
| [Amazon Bedrock (InvokeModel)](https://platform.claude.com/docs/ja/build-with-claude/claude-on-amazon-bedrock-legacy) | `anthropic.claude-opus-4-5-20251101-v1:0` |
| [Google Cloud](https://platform.claude.com/docs/ja/build-with-claude/claude-on-vertex-ai) | `claude-opus-4-5@20251101` |
| [Microsoft Foundry](https://platform.claude.com/docs/ja/build-with-claude/claude-in-microsoft-foundry) | `claude-opus-4-5` |
| [Claude Platform on AWS](https://platform.claude.com/docs/ja/build-with-claude/claude-platform-on-aws) | `claude-opus-4-5` |
### Pricing
| Feature | Value |
| :------------------------------------------------------------------------------------- | :------------------------------- |
| Input | $5 / MTok |
| Output | $25 / MTok |
| [5m cache write](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $6.25 / MTok |
| [1h cache write](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $10 / MTok |
| [Cache read](https://platform.claude.com/docs/ja/build-with-claude/prompt-caching) | $0.50 / 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) | 200K tokens |
| Max output | 64K tokens |
| [Thinking](https://platform.claude.com/docs/ja/build-with-claude/thinking) | Extended |
| [Default effort](https://platform.claude.com/docs/ja/build-with-claude/effort) | `high` |
| Input → output | Text and images → text |
| Reliable knowledge cutoff | May 2025 |
| Training data cutoff | Aug 2025 |
### Availability
| Feature | Value |
| :---------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Status](https://platform.claude.com/docs/ja/about-claude/model-deprecations) | Active (legacy) |
| Released | November 24, 2025 |
| Retirement | Not sooner than November 24, 2026 |
| Platforms | Claude API, [Amazon Bedrock (InvokeModel)](https://platform.claude.com/docs/ja/build-with-claude/claude-on-amazon-bedrock-legacy), [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 Opus 4.5からClaude Opus 5.5へ移行する際の変更点。
現在のOpusモデル：概要、仕様、リソース。
## リファレンス
Claude Opus 4.5 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 Opus 4.5 の安全性評価とデプロイメントの決定。
バッチ割引や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、ピン留めされた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。
Claude Opus 4.5 は InvokeModel Bedrock 統合と Bedrock スタイルのモデルIDを使用します。