[Workers AI, AI Gateway] Document unified billing

[mchenco]

Summary

Documents Workers AI unified billing through AI Gateway, including gateway configuration, AI binding and REST API usage, paid model access, and elevated rate limits for frontier models. Adds a cross-product changelog entry for the update.

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/product-owners, @hoan-pom
/src/content/docs/ai-gateway/	@abhishekkankani, @palashgo, @thebongy, @roerohan, @kathayl, @mchenco, @zeke, @superhighfives, @adriandlam, @mattrothenberg, @ethulia, @aninibread, @kflansburg, @cloudflare/product-owners
/src/content/docs/workers-ai/	@rita3ko, @craigsdennis, @mchenco, @zeke, @superhighfives, @mattrothenberg, @ethulia, @aninibread, @kflansburg, @cloudflare/product-owners
/src/content/partials/ai-gateway/	@abhishekkankani, @palashgo, @thebongy, @roerohan, @kathayl, @mchenco, @zeke, @superhighfives, @adriandlam, @mattrothenberg, @ethulia, @aninibread, @kflansburg, @cloudflare/product-owners
*	@cloudflare/product-owners

[github-actions]

Preview URL: https://117e0b93.preview.developers.cloudflare.com
Preview Branch URL: https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/post/2026-08-07-workers-ai-unified-billing/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/changelog/post/2026-08-07-workers-ai-unified-billing/
https://developers.cloudflare.com/ai-gateway/configuration/manage-gateway/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/ai-gateway/configuration/manage-gateway/
https://developers.cloudflare.com/ai-gateway/usage/worker-binding-methods/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/ai-gateway/usage/worker-binding-methods/
https://developers.cloudflare.com/workers-ai/platform/limits/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/workers-ai/platform/limits/
https://developers.cloudflare.com/workers-ai/platform/pricing/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/workers-ai/platform/pricing/
https://developers.cloudflare.com/ai-gateway/features/unified-billing/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/ai-gateway/features/unified-billing/
https://developers.cloudflare.com/ai-gateway/usage/rest-api/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/ai-gateway/usage/rest-api/
https://developers.cloudflare.com/ai-gateway/get-started/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/ai-gateway/get-started/
https://developers.cloudflare.com/ai-gateway/usage/providers/workersai/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/ai-gateway/usage/providers/workersai/
https://developers.cloudflare.com/workers-ai/platform/ai-gateway/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/workers-ai/platform/ai-gateway/

[cloudflare-docs-bot]

Review

⚠️ 3 warnings, 💡 1 suggestion found in commit 117e0b9.

👉 Fix in your agent 👈

Fix the following review findings in PR #32561 (https://github.com/cloudflare/cloudflare-docs/pull/32561).

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1. Post a comment on this PR for any findings you are skipping, with the finding ID and your reasoning.
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---

## Code Review

### Warnings (2)

#### CR-2d960f7a39f4 · Content contradicts existing Unified Billing docs
- **File:** `src/content/partials/ai-gateway/create-gateway.mdx` line 16
- **Issue:** The added step says Workers AI requests can be billed via **Unified billing**, but `/ai-gateway/features/unified-billing/` currently states: "Workers AI models (models prefixed with `@cf/`) routed through AI Gateway are not charged via Unified Billing... Unified Billing only applies to third-party provider models."
- **Fix:** Reconcile the two pages. If Workers AI now supports Unified Billing, update `/ai-gateway/features/unified-billing/` to remove or qualify the statement that it only applies to third-party models. If Workers AI does not support Unified Billing, do not present it as an option for Workers AI billing here.

#### CR-f2c50ced7414 · REST API example omits required gateway header
- **File:** `src/content/docs/ai-gateway/features/unified-billing.mdx` line 77
- **Issue:** Line 77 instructs users to include the `cf-aig-gateway-id` header for REST API requests, but the curl example in the following REST API subsection does not include it. For Workers AI requests, this header is required to route through AI Gateway and use Unified Billing credits.
- **Fix:** Update the REST API curl example to include `--header "cf-aig-gateway-id: my-gateway"` (or use a `@cf/` Workers AI model in an example that demonstrates the Workers AI flow).

---

## Style Guide Review

### Warnings (1)

#### SG-a7bcf7a62d57 · Directional words
- **File:** `src/content/docs/ai-gateway/usage/rest-api.mdx` line 120
- **Issue:** Line uses `shown above` to refer to a previous example
- **Fix:** Replace `shown above` with a direct reference by name or link, such as `in the cURL example` or `in the example request`.

### Suggestions (1)

#### SG-232fa8063e50 · Serial comma
- **File:** `src/content/docs/ai-gateway/usage/providers/workersai.mdx` line 15
- **Issue:** List `analytics, logging, caching, security, and prepaid billing` is missing the comma before the final `and`.
- **Fix:** Add a comma before `and`: `analytics, logging, caching, security, and prepaid billing` → `analytics, logging, caching, security, and prepaid billing`.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

Warnings (2)

File	Issue
partials/ai-gateway/create-gateway.mdx line 16	Content contradicts existing Unified Billing docs — The added step says Workers AI requests can be billed via **Unified billing**, but /ai-gateway/features/unified-billing/ currently states: "Workers AI models (models prefixed with @cf/) routed through AI Gateway are not charged via Unified Billing... Unified Billing only applies to third-party provider models." Fix: Reconcile the two pages. If Workers AI now supports Unified Billing, update /ai-gateway/features/unified-billing/ to remove or qualify the statement that it only applies to third-party models. If Workers AI does not support Unified Billing, do not present it as an option for Workers AI billing here.
ai-gateway/features/unified-billing.mdx line 77	REST API example omits required gateway header — Line 77 instructs users to include the cf-aig-gateway-id header for REST API requests, but the curl example in the following REST API subsection does not include it. For Workers AI requests, this header is required to route through AI Gateway and use Unified Billing credits. Fix: Update the REST API curl example to include --header "cf-aig-gateway-id: my-gateway" (or use a @cf/ Workers AI model in an example that demonstrates the Workers AI flow).

Conventions

_{No convention issues found.}

Style Guide Review

Warnings (1)

File	Issue
ai-gateway/usage/rest-api.mdx line 120	Directional words — Line uses shown above to refer to a previous example Fix: Replace shown above with a direct reference by name or link, such as in the cURL example or in the example request.

Suggestions (1)

File	Issue
ai-gateway/usage/providers/workersai.mdx line 15	Serial comma — List analytics, logging, caching, security, and prepaid billing is missing the comma before the final and. Fix: Add a comma before and: analytics, logging, caching, security, and prepaid billing → analytics, logging, caching, security, and prepaid billing.

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[mchenco]

DO NOT MERGE