GLM 4.5 Air vs GLM 5.3
z-ai/glm-4.5-air · z-ai/glm-5.3
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 $0.0003 / $0.0145 for GLM 5.3, about 94% 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 when context size wins. GLM 5.3 carries the larger context window (1,000,000 vs 128,000 tokens), which can matter for long-document work.
GLM 4.5 Air vs GLM 5.3, side by side
| Spec | GLM 4.5 Air | GLM 5.3 |
|---|---|---|
| Price · input / 1M | $0.0001 | $0.0003 |
| Price · output / 1M | $0.0008 | $0.0145 |
| Context length | 128,000 | 1,000,000 |
| Max output tokens | 32,768 | 131,072 |
| Input modalities | text | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 99.9% off | 99.6% off |
| First token, median (7 days) | — | 3.8 s (521 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 — FAQ
Is GLM 4.5 Air or GLM 5.3 cheaper?
GLM 4.5 Air is cheaper on a blended token mix, by about 94%. 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?
GLM 4.5 Air: $0.0001 in / $0.0008 out per 1M tokens. GLM 5.3: $0.0003 in / $0.0145 out per 1M tokens. That's roughly a 94% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GLM 4.5 Air and GLM 5.3 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.