GLM 4.5 Air vs GLM 5.3 Flash
z-ai/glm-4.5-air · z-ai/glm-5.3-flash
As of November 3, 2026, GLM 4.5 Air is the cheaper API on UberLLM: $0.0001 per million input tokens and $0.0008 per million output, versus $0.0009 / $0.0029 for GLM 5.3 Flash, about 72% 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 GLM 5.3 Flash when context size wins. GLM 5.3 Flash carries the larger context window (1,048,576 vs 128,000 tokens), which can matter for long-document work.
GLM 4.5 Air vs GLM 5.3 Flash, side by side
| Spec | GLM 4.5 Air | GLM 5.3 Flash |
|---|---|---|
| Price · input / 1M | $0.0001 | $0.0009 |
| Price · output / 1M | $0.0008 | $0.0029 |
| 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 | 96.9% off |
| First token, median (7 days) | — | 5.1 s (3,760 requests) |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 3, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GLM 4.5 Air vs GLM 5.3 Flash — FAQ
Is GLM 4.5 Air or GLM 5.3 Flash cheaper?
GLM 4.5 Air is cheaper on a blended token mix, by about 72%. 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 GLM 5.3 Flash?
GLM 4.5 Air: $0.0001 in / $0.0008 out per 1M tokens. GLM 5.3 Flash: $0.0009 in / $0.0029 out per 1M tokens. That's roughly a 72% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GLM 4.5 Air and GLM 5.3 Flash 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.