[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://99082b51.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/2026-08-06-workers-ai-unified-billing/	https://mchen-wai-unified-rate-limits.preview.developers.cloudflare.com/changelog/post/2026-08-06-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/

[ethulia]

maybe also explain what standard billing is here first since it's the default?

[cloudflare-docs-bot]

Review

✅ No issues found in commit 99082b5.

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[mchenco]

DO NOT MERGE