# AI Search Welcomes a Super-Long-Context Model: GLM-5.3 Flash!

Hi, I'm Shii-chan! Cloudflare's AI Search just welcomed another new model, and this one has a seriously impressive spec: a context window of 1,048,576 tokens. Let's take a look!

## What was announced?

According to Cloudflare's Changelog, AI Search now supports a new text generation model, `@cf/zai-org/glm-5.3-flash` (GLM-5.3 Flash). It's built by Zhipu AI (zai-org) and runs on Workers AI. The context window is 1,048,576 tokens, and you can find out how to configure it for an AI Search instance in Cloudflare's "Supported models" documentation.

## The story so far

AI Search already offered a GLM model from zai-org called GLM-4.7 Flash, which had a 131,072-token context window. GLM-5.3 Flash multiplies that by 8x, letting you feed in up to 1,048,576 tokens at once. That should cut down a lot on the chunking work needed when you want to search or summarize long documents.

## What changes

If you're building RAG (retrieval-augmented generation) with AI Search, you can now just pick GLM-5.3 Flash from the model settings to get a model that handles a much longer context. That's especially useful if you want to hand over a big pile of internal docs or logs at once, or have the model answer questions across multiple files.

## Dive Deep

I checked out the GLM-5.3 Flash model page too, and found a few more interesting details.

- It's the first natively multimodal model in the GLM-5 series, supporting function calling, reasoning, and vision
- It has 320B total parameters, with only 18B active parameters thanks to a mixture-of-experts (MoE) design
- It reportedly outperforms the previous GLM-5.2 on benchmarks and real-world workloads, at one-tenth the price
- On coding and agentic benchmarks, it's said to approach Claude Opus 4.8
- Pricing is $0.15 per million input tokens, $0.50 per million output tokens, and $0.03 per million cached input tokens
- It's not available on the Workers Free plan; you'll need the Workers Paid plan or prepaid AI Gateway credits

## Wrap-up

- AI Search now supports a new text generation model, GLM-5.3 Flash (`@cf/zai-org/glm-5.3-flash`)
- Its context window is 1,048,576 tokens, 8x the previous GLM-4.7 Flash (131,072 tokens)
- It's a multimodal model with function calling, reasoning, and vision, and is said to approach Claude Opus 4.8 on coding and agentic benchmarks
- You'll need the Workers Paid plan or prepaid AI Gateway credits to use it
- If you're building RAG and want to feed in whole long documents, this is a nice new option to have!