[Workers AI] Add GLM 5.3 Flash model

[mchenco]

Summary

Adds the GLM-5.3 Flash model launch docs for Workers AI:

• New model page data (glm-5.3-flash.json, pulled from the catalog API)
• Pricing page updates: added GLM-5.3 Flash to the paid-models note and the pricing table
• New changelog announcement

GLM-5.3 Flash is a 320B-parameter MoE model (18B active) with vision, reasoning, and function calling. It has a 1,048,576 token context window and requires the Workers Paid plan or AI Gateway credits.

Documentation checklist

• Is there a changelog entry? Added 2026-08-26-glm-5.3-flash-workers-ai.mdx.
• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

⚠️ 1 warning found in commit 87adfe8.

👉 Fix in your agent 👈

Fix the following review findings in PR #33041 (https://github.com/cloudflare/cloudflare-docs/pull/33041).

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---

## Code Review

### Warnings (1)

#### CR-0880ef0a93e3 · Capability mismatch in model schema
- **File:** `src/content/workers-ai-models/glm-5.3-flash.json` line 25
- **Issue:** The model declares `"vision": "true"`, but the `messages[*].content` schema only permits a string or an array of text parts (lines 166–188). There is no `image_url` (or `video_url`) content part, so the schema does not reflect the advertised multimodal capability.
- **Fix:** Add `image_url` (and any other applicable modalities such as `video_url`) as content part options in `messages[*].content.items`, matching the richer schema used by other vision models like `glm-5.2.json`.

Code Review

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

Warnings (1)

File

Issue

workers-ai-models/glm-5.3-flash.json line 25

Capability mismatch in model schema — The model declares "vision": "true", but the messages[\*].content schema only permits a string or an array of text parts (lines 166–188). There is no image_url (or video_url) content part, so the schema does not reflect the advertised multimodal capability. Fix: Add image_url (and any other applicable modalities such as video_url) as content part options in messages[\*].content.items, matching the richer schema used by other vision models like glm-5.2.json.

Conventions

_{No convention issues found.}

Style Guide Review

_{No style-guide issues found.}

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[cloudflare-workers-and-pages]

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[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
/src/content/docs/workers-ai/	@rita3ko, @craigsdennis, @mchenco, @zeke, @superhighfives, @shridhar-cf, @mattrothenberg, @ethulia, @aninibread, @kflansburg, @cloudflare/product-owners
/src/content/workers-ai-models/	@craigsdennis, @mchenco, @superhighfives, @shridhar-cf, @ethulia, @kflansburg, @cloudflare/product-owners, @kodster28

[github-actions]

Preview URL: https://87adfe8e.preview.developers.cloudflare.com
Preview Branch URL: https://mchen-glm-5-3-flash.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/post/2026-08-26-glm-53-flash-workers-ai/	https://mchen-glm-5-3-flash.preview.developers.cloudflare.com/changelog/post/2026-08-26-glm-53-flash-workers-ai/
https://developers.cloudflare.com/workers-ai/platform/pricing/	https://mchen-glm-5-3-flash.preview.developers.cloudflare.com/workers-ai/platform/pricing/