4 ファイル変更+26-36
この更新の概要
モデル概要ページにおいて、Claude Fable 5およびClaude Mythos 5のスペックと価格情報が詳細な比較表として整理されました。Claude Codeの自動インストールを制御する環境変数 CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL の設定値が「1」であることが明示されています。VS Code統合ターミナルでの拡張機能の自動再インストール挙動と、それを無効化するための具体的な設定方法が追加されました。これらにより、最新モデルの選択基準とIDE連携のカスタマイズ方法がより具体化されています。
@@ -6,7 +6,7 @@ Claude is a family of state-of-the-art large language models developed by Anthro
## Choosing a model
If you're unsure which model to use, consider starting with **Claude Opus 4.8** for the most complex tasks. It is Anthropic's most capable Opus-tier model for complex reasoning, long-horizon agentic coding, and high-autonomy work. For workloads that need the highest available capability, see [Claude Fable 5](#claude-fable-5-and-claude-mythos-5).
If you're unsure which model to use, start with **Claude Opus 4.8** for complex agentic coding and enterprise work. For workloads that need the highest available capability, use [Claude Fable 5](#claude-fable-5-and-claude-mythos-5).
All current Claude models support text and image input, text output, multilingual capabilities, and vision. Models are available through the Claude API, [Claude Platform on AWS](/docs/en/build-with-claude/claude-platform-on-aws), [Amazon Bedrock](/docs/en/build-with-claude/claude-in-amazon-bedrock), [Google Cloud](/docs/en/build-with-claude/claude-on-vertex-ai), and [Microsoft Foundry](/docs/en/build-with-claude/claude-in-microsoft-foundry).
@@ -14,50 +14,38 @@ Once you've picked a model, [learn how to make your first API call](/docs/en/get
### Claude Fable 5 and Claude Mythos 5
Claude Fable 5 (`claude-fable-5`) is Anthropic's most capable widely released model. Claude Mythos 5 (`claude-mythos-5`) joins the invitation-only Claude Mythos Preview (`claude-mythos-preview`) within [Project Glasswing](https://anthropic.com/glasswing). See [Introducing Claude Fable 5 and Claude Mythos 5](/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) for launch details and API changes.
| Feature | Claude Fable 5 | Claude Mythos 5 |
| --------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Description** | Anthropic's most capable widely released model, for the most demanding reasoning and long-horizon agentic work | Available through Project Glasswing. Successor to Claude Mythos Preview. |
| **Claude API ID** | `claude-fable-5` | `claude-mythos-5` |
| **AWS Bedrock ID** | anthropic.claude-fable-5 | Limited availability |
| **Google Cloud ID** | claude-fable-5 | Limited availability |
| **[Extended thinking](/docs/en/build-with-claude/extended-thinking)** | No | No |
| **[Adaptive thinking](/docs/en/build-with-claude/adaptive-thinking)** | Yes (always on) | Yes (always on) |
| **Context window** | <Tooltip tooltipContent="Claude Fable 5 and Claude Mythos 5 use the tokenizer introduced with Claude Opus 4.7. Compared to models before Claude Opus 4.7, the same text produces roughly 30% more tokens.">1M tokens</Tooltip> | <Tooltip tooltipContent="Claude Fable 5 and Claude Mythos 5 use the tokenizer introduced with Claude Opus 4.7. Compared to models before Claude Opus 4.7, the same text produces roughly 30% more tokens.">1M tokens</Tooltip> |
| **Max output** | 128k tokens | 128k tokens |
| **Pricing** | $10 / $50 per MTok (input / output) | $10 / $50 per MTok (input / output) |
Claude Fable 5 (`claude-fable-5`) is Anthropic's most capable widely released model. Claude Mythos 5 (`claude-mythos-5`) shares Claude Fable 5's specs and pricing and joins the invitation-only Claude Mythos Preview (`claude-mythos-preview`) within [Project Glasswing](https://anthropic.com/glasswing). See [Introducing Claude Fable 5 and Claude Mythos 5](/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) for launch details and API changes.
Claude Fable 5 is generally available on the Claude API, Claude Platform on AWS, Amazon Bedrock, Google Cloud, and Microsoft Foundry beginning June 9, 2026. Claude Mythos 5 is not generally available: it is offered in limited availability to approved customers in [Project Glasswing](https://anthropic.com/glasswing), beginning the same day. For access, contact your Anthropic, AWS, or Google Cloud account team.
### Latest models comparison
| Feature | Claude Opus 4.8 | Claude Sonnet 5 | Claude Haiku 4.5 |
| --------------------------------------------------------------------- | ------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------- |
| **Description** | Anthropic's most capable Opus-tier model for complex reasoning and agentic coding | The best combination of speed and intelligence | The fastest model with near-frontier intelligence |
| **Claude API ID** | claude-opus-4-8 | `claude-sonnet-5` | claude-haiku-4-5-20251001 |
| **Claude API alias** | claude-opus-4-8 | `claude-sonnet-5` | claude-haiku-4-5 |
| **AWS Bedrock ID** | anthropic.claude-opus-4-83 | `anthropic.claude-sonnet-5`3 | anthropic.claude-haiku-4-5-20251001-v1:0 |
| **Google Cloud ID** | claude-opus-4-8 | `claude-sonnet-5` | claude-haiku-4-5\@20251001 |
| **Pricing**1 | $5 / input MTok $25 / output MTok | $3 / input MTok $15 / output MTok4 | $1 / input MTok $5 / output MTok |
| **[Extended thinking](/docs/en/build-with-claude/extended-thinking)** | No | No | Yes |
| **[Adaptive thinking](/docs/en/build-with-claude/adaptive-thinking)** | Yes | Yes | No |
| **Comparative latency** | Moderate | Fast | Fastest |
| **Context window** | <Tooltip tooltipContent="~555k words \ ~2.5M unicode characters">1M tokens</Tooltip> | <Tooltip tooltipContent="~555k words \ ~2.5M unicode characters">1M tokens</Tooltip> | <Tooltip tooltipContent="~150k words \ ~680k unicode characters">200k tokens</Tooltip> |
| **Max output** | 128k tokens | 128k tokens | 64k tokens |
| **Reliable knowledge cutoff** | Jan 20262 | Jan 20262 | Feb 2025 |
| **Training data cutoff** | Jan 2026 | Jan 2026 | Jul 2025 |
| Feature | Claude Fable 5 | Claude Opus 4.8 | Claude Sonnet 5 | Claude Haiku 4.5 |
| --------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------- |
| **Description** | Next-generation intelligence for long-running agents | For complex agentic coding and enterprise work | The best combination of speed and intelligence | The fastest model with near-frontier intelligence |
| **Claude API ID** | claude-fable-5 | claude-opus-4-8 | `claude-sonnet-5` | claude-haiku-4-5-20251001 |
| **Claude API alias** | claude-fable-5 | claude-opus-4-8 | `claude-sonnet-5` | claude-haiku-4-5 |
| **AWS Bedrock ID** | anthropic.claude-fable-53 | anthropic.claude-opus-4-83 | `anthropic.claude-sonnet-5`3 | anthropic.claude-haiku-4-5-20251001-v1:0 |
| **Google Cloud ID** | claude-fable-5 | claude-opus-4-8 | `claude-sonnet-5` | claude-haiku-4-5\@20251001 |
| **Pricing**1 | $10 / input MTok $50 / output MTok | $5 / input MTok $25 / output MTok | $3 / input MTok $15 / output MTok4 | $1 / input MTok $5 / output MTok |
| **[Extended thinking](/docs/en/build-with-claude/extended-thinking)** | No | No | No | Yes |
| **[Adaptive thinking](/docs/en/build-with-claude/adaptive-thinking)** | Yes (always on) | Yes | Yes | No |
| **Comparative latency** | Slower | Moderate | Fast | Fastest |
| **Context window** | <Tooltip tooltipContent="~555k words \ ~2.5M unicode characters. Claude Fable 5 uses the tokenizer introduced with Claude Opus 4.7; compared to models before Claude Opus 4.7, the same text produces roughly 30% more tokens.">1M tokens</Tooltip> | <Tooltip tooltipContent="~555k words \ ~2.5M unicode characters">1M tokens</Tooltip> | <Tooltip tooltipContent="~555k words \ ~2.5M unicode characters">1M tokens</Tooltip> | <Tooltip tooltipContent="~150k words \ ~680k unicode characters">200k tokens</Tooltip> |
| **Max output** | 128k tokens | 128k tokens | 128k tokens | 64k tokens |
| **Reliable knowledge cutoff** | Jan 20262 | Jan 20262 | Jan 20262 | Feb 2025 |
| **Training data cutoff** | Jan 2026 | Jan 2026 | Jan 2026 | Jul 2025 |
*1 - See [Pricing](/docs/en/about-claude/pricing) for complete pricing information including Batch API discounts and prompt caching rates.*
*2 - **Reliable knowledge cutoff** indicates the date through which a model's knowledge is most extensive and reliable. **Training data cutoff** is the broader date range of training data used. For more information, see [Anthropic's Transparency Hub](https://www.anthropic.com/transparency).*
*3 - Claude Opus 4.8 and Claude Sonnet 5 are available on Bedrock through [Claude in Amazon Bedrock](/docs/en/build-with-claude/claude-in-amazon-bedrock) (the Messages-API Bedrock endpoint).*
*3 - Claude Fable 5, Claude Opus 4.8, and Claude Sonnet 5 are available on Bedrock through [Claude in Amazon Bedrock](/docs/en/build-with-claude/claude-in-amazon-bedrock) (the Messages-API Bedrock endpoint).*
*4 - Introductory pricing of $2 / $10 per MTok applies to Claude Sonnet 5 through August 31, 2026. See [Pricing](/docs/en/about-claude/pricing#claude-sonnet-5-introductory-pricing).*
<Info>
[Claude Mythos Preview](https://anthropic.com/glasswing) is offered separately as a research preview model for defensive cybersecurity workflows as part of [Project Glasswing](https://anthropic.com/glasswing). Access is invitation-only and there is no self-serve sign-up.
Claude Mythos 5 and Claude Mythos Preview are offered separately for defensive cybersecurity workflows as part of [Project Glasswing](https://anthropic.com/glasswing). Access is invitation-only and there is no self-serve sign-up.
</Info>
<Note>
@@ -161,14 +149,14 @@ Claude Fable 5 is generally available on the Claude API, Claude Platform on AWS,
Claude 4 models excel in:
* **Performance**: Top-tier results in reasoning, coding, multilingual tasks, long-context handling, honesty, and image processing. See the [Claude 4 blog post](https://www.anthropic.com/news/claude-4) for more information.
* **Performance:** Top-tier results in reasoning, coding, multilingual tasks, long-context handling, honesty, and image processing. See the [Claude 4 blog post](https://www.anthropic.com/news/claude-4) for more information.
* **Engaging responses**: Claude models are ideal for applications that require rich, human-like interactions.
* **Engaging responses:** Claude models are ideal for applications that require rich, human-like interactions.
* If you prefer more concise responses, you can adjust your prompts to guide the model toward the desired output length. Refer to the [prompt engineering guides](/docs/en/build-with-claude/prompt-engineering) for details.
* For prompting best practices, see [Prompting best practices](/docs/en/build-with-claude/prompt-engineering/claude-prompting-best-practices).
* **Output quality**: When migrating from previous model generations to Claude 4, you may notice larger improvements in overall performance.
* **Output quality:** When migrating from previous model generations to Claude 4, you may notice larger improvements in overall performance.
## Migrating to Claude Opus 4.8
IDE拡張機能の自動インストールをスキップするための環境変数 CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL に設定すべき値が 1 であることが追記されました。
@@ -209,7 +209,7 @@ Claude Code reads environment variables at startup, so changes take effect the n
| `CLAUDE_CODE_GLOB_TIMEOUT_SECONDS` | Timeout in seconds for Glob tool file discovery. Defaults to 20 seconds on most platforms and 60 seconds on WSL |
| `CLAUDE_CODE_HIDE_CWD` | Set to `1` to hide the working directory in the startup logo. Useful for screenshares or recordings where the path exposes your OS username |
| `CLAUDE_CODE_IDE_HOST_OVERRIDE` | Override the host address used to connect to the IDE extension. By default Claude Code auto-detects the correct address, including WSL-to-Windows routing |
| `CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL` | Skip auto-installation of IDE extensions. Equivalent to setting [`autoInstallIdeExtension`](/en/settings#global-config-settings) to `false` |
| `CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL` | Set to `1` to skip auto-installation of IDE extensions. Equivalent to setting [`autoInstallIdeExtension`](/en/settings#global-config-settings) to `false` |
| `CLAUDE_CODE_IDE_SKIP_VALID_CHECK` | Set to `1` to skip validation of IDE lockfile entries during connection. Use when auto-connect fails to find your IDE despite it running |
| `CLAUDE_CODE_MAX_CONTEXT_TOKENS` | Override the context window size Claude Code assumes for the active model. As of v2.1.193, applied directly for model names Claude Code does not recognize as a Claude model; for recognized Claude models it only takes effect when `DISABLE_COMPACT` is also set. Use this when routing to a model through `ANTHROPIC_BASE_URL` whose context window does not match the built-in size for its name |
| `CLAUDE_CODE_MAX_OUTPUT_TOKENS` | Set the maximum number of output tokens for most requests. Defaults and caps vary by model; see [max output tokens](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison). Increasing this value reduces the effective context window available before [auto-compaction](/en/costs#reduce-token-usage) triggers |
@@ -319,7 +319,7 @@ Versions before v2.1.119 also store a number of `/config` preference keys here i
| Key | Description | Example |
| :- | :- | :- |
| `autoConnectIde` | **Default**: `false`. Automatically connect to a running IDE when Claude Code starts from an external terminal. Appears in `/config` as **Auto-connect to IDE (external terminal)** when running outside a VS Code or JetBrains terminal. The [`CLAUDE_CODE_AUTO_CONNECT_IDE`](/en/env-vars) environment variable overrides this when set | `true` |
| `autoInstallIdeExtension` | **Default**: `true`. Automatically install the Claude Code IDE extension when running from a VS Code terminal. Appears in `/config` as **Auto-install IDE extension** when running inside a VS Code or JetBrains terminal. You can also set the [`CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL`](/en/env-vars) environment variable | `false` |
| `autoInstallIdeExtension` | **Default**: `true`. Automatically install the Claude Code IDE extension when running from a VS Code terminal. Appears in `/config` as **Auto-install IDE extension** when running inside a VS Code or JetBrains terminal. You can also set the [`CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL`](/en/env-vars) environment variable to `1` | `false` |
| `externalEditorContext` | **Default**: `false`. Prepend Claude's previous response as `#`-commented context when you open the external editor with `Ctrl+G`. Appears in `/config` as **Show last response in external editor** | `true` |
| `teammateDefaultModel` | Default model for [agent team](/en/agent-teams) teammates when the spawn prompt doesn't specify one. Set to a model alias such as `"sonnet"`, or `null` to inherit the lead's current `/model` selection. Appears in `/config` as **Default teammate model** | `"sonnet"` |
@@ -463,6 +463,8 @@ To uninstall the Claude Code extension:
2. Search for "Claude Code"
3. Click **Uninstall**
Running `claude` in a VS Code integrated terminal reinstalls the extension automatically. To keep it uninstalled, turn off **Auto-install IDE extension** in `/config`, or set [`autoInstallIdeExtension`](/en/settings#global-config-settings) to `false`. You can also set the [`CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL`](/en/env-vars) environment variable to `1`.
To also remove extension data and reset all settings, delete the extension's storage directory for your platform.
On macOS: