GLM 4.5 Air vs Z.ai: GLM 5.3 FlashX
z-ai/glm-4.5-air · z-ai/glm-5.3-flashx
As of November 4, 2026, GLM 4.5 Air is the cheaper API on UberLLM: $0.0001 per million input tokens and $0.0008 per million output, versus $0.1110 / $0.3750 for Z.ai: GLM 5.3 FlashX, about 100% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose GLM 4.5 Air to cut cost; choose Z.ai: GLM 5.3 FlashX when context size wins. Z.ai: GLM 5.3 FlashX carries the larger context window (1,048,576 vs 128,000 tokens), which can matter for long-document work.
GLM 4.5 Air vs Z.ai: GLM 5.3 FlashX, side by side
| Spec | GLM 4.5 Air | Z.ai: GLM 5.3 FlashX |
|---|---|---|
| Price · input / 1M | $0.0001 | $0.1110 |
| Price · output / 1M | $0.0008 | $0.3750 |
| Context length | 128,000 | 1,048,576 |
| Max output tokens | 32,768 | 131,072 |
| Input modalities | text | text, image, video |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | — | Yes |
| Reasoning | Yes | Yes |
| % off list | 99.9% off | 70% off |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 4, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GLM 4.5 Air vs Z.ai: GLM 5.3 FlashX — FAQ
Is GLM 4.5 Air or Z.ai: GLM 5.3 FlashX cheaper?
GLM 4.5 Air is cheaper on a blended token mix, by about 100%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between GLM 4.5 Air and Z.ai: GLM 5.3 FlashX?
GLM 4.5 Air: $0.0001 in / $0.0008 out per 1M tokens. Z.ai: GLM 5.3 FlashX: $0.1110 in / $0.3750 out per 1M tokens. That's roughly a 100% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GLM 4.5 Air and Z.ai: GLM 5.3 FlashX with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.