claude-platform-on-aws

 
 ### Region resolution
 
-The client reads `AWS_REGION` from the environment if `aws_region`/`awsRegion` is not passed to the constructor, falling back to `AWS_DEFAULT_REGION` for compatibility with the standard AWS SDKs. Region is required. There is no fallback default. Unlike `AnthropicBedrock`, which falls back to `us-east-1`, the `AnthropicAWS`/`AnthropicAws` client raises an error if neither the constructor argument nor the environment variable is set.
+The client reads `AWS_REGION` from the environment if `aws_region`/`awsRegion` is not passed to the constructor, falling back to `AWS_DEFAULT_REGION` for compatibility with the standard AWS SDKs. Region is required and there is no default: the `AnthropicAWS`/`AnthropicAws` client raises an error if neither the constructor argument nor an environment variable is set.
 
 ## Install an SDK
 

 | Model             | Model ID          |
 | ----------------- | ----------------- |
 | Claude Fable 5    | claude-fable-5    |
+| Claude Opus 5     | claude-opus-5     |
 | Claude Opus 4.8   | claude-opus-4-8   |
 | Claude Opus 4.7   | claude-opus-4-7   |
 | Claude Opus 4.6   | claude-opus-4-6   |

 
 ### Spend limits
 
-The Start, Build, and Scale usage tiers each carry a monthly spend cap; see the [per-tier spend caps](https://platform.claude.com/docs/en/api/rate-limits#spend-limits) for current values. When your organization's usage for the calendar month reaches its tier's cap, API requests fail with the [spend-cap error](https://platform.claude.com/docs/en/api/rate-limits#reaching-your-spend-cap) until 00UTC on the first day of the next month, and retrying sooner doesn't succeed. The spend cap and rate limits belong to the same tier. To raise the cap, or to restore access after reaching it, request a tier increase through your Anthropic account representative or [Anthropic support](https://support.claude.com) (see [Rate limits and quotas](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws#rate-limits-and-quotas)).
+The Start, Build, and Scale usage tiers each carry a monthly spend cap; see the [per-tier spend caps](https://platform.claude.com/docs/en/api/rate-limits#spend-limits) for current values. When your organization's usage for the calendar month reaches its tier's cap, API requests fail with the [spend-cap error](https://platform.claude.com/docs/en/api/rate-limits#reaching-your-spend-cap) until 00:00 UTC on the first day of the next month, and retrying sooner doesn't succeed. The spend cap and rate limits belong to the same tier. To raise the cap, or to restore access after reaching it, request a tier increase through your Anthropic account representative or [Anthropic support](https://support.claude.com) (see [Rate limits and quotas](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws#rate-limits-and-quotas)).
 
-You can also set your own monthly spend limits below the cap, after adding at least one recipient under **Email notifications** on the Billing page:
+You can also set your own monthly spend limits below the cap, after adding at least one recipient under **Email recipients** on the Billing page:
 
 * **Organization spend limit:** Go to [Settings > Billing](https://platform.claude.com/settings/billing) in the [Claude Console](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws#using-the-claude-console) to set a monthly spend limit.
 * **Workspace spend limits:** Select a workspace under [Settings > Workspaces](https://platform.claude.com/settings/workspaces) and open its **Spend limits** page. Workspace details are otherwise read-only in the Claude Console on Claude Platform on AWS.
 
-When usage reaches a limit you set, requests fail with HTTP 400 (see the [spend limit error](https://platform.claude.com/docs/en/api/rate-limits#setting-your-own-spend-limit)) until 00UTC on the first day of the next month, or until you raise or remove the limit.
+When usage reaches a limit you set, requests fail with HTTP 400 (see the [spend limit error](https://platform.claude.com/docs/en/api/rate-limits#setting-your-own-spend-limit)) until 00:00 UTC on the first day of the next month, or until you raise or remove the limit.
 
-Spend is calculated at list prices and can take about 2 hours to reflect recent usage, so usage can exceed the cap or a limit before requests start failing. The overshoot is billed. When the tier cap or an organization spend limit stops your requests, an email notice goes to the recipients listed under **Email notifications** on the Billing page. Role-based recipients, such as all admins, aren't available on Claude Platform on AWS. The tier-cap notice also goes to the email address used at AWS Marketplace sign-up.
+Spend is calculated at list prices and can take about 2 hours to reflect recent usage, so usage can exceed the cap or a limit before requests start failing. The overshoot is billed. When the tier cap or an organization spend limit stops your requests, an email notice goes to the recipients listed under **Email recipients** on the Billing page. Role-based recipients, such as all admins, aren't available on Claude Platform on AWS. The tier-cap notice also goes to the email address used at AWS Marketplace sign-up.
 
 ## Monitoring and logging