GLM 4.5 vs GLM 5.3 Flash
z-ai/glm-4.5 · z-ai/glm-5.3-flash
As of November 5, 2026, GLM 5.3 Flash is the cheaper API on UberLLM: $0.0009 per million input tokens and $0.0029 per million output, versus $0.0059 / $0.0216 for GLM 4.5, about 86% 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 5.3 Flash to cut cost; choose GLM 4.5 when its capabilities fit your task better.
GLM 4.5 vs GLM 5.3 Flash, side by side
| Spec | GLM 4.5 | GLM 5.3 Flash |
|---|---|---|
| Price · input / 1M | $0.0059 | $0.0009 |
| Price · output / 1M | $0.0216 | $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% off | 99.4% off |
| First token, median (7 days) | — | 5.2 s (4,006 requests) |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 5, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GLM 4.5 vs GLM 5.3 Flash — FAQ
Is GLM 4.5 or GLM 5.3 Flash cheaper?
GLM 5.3 Flash is cheaper on a blended token mix, by about 86%. 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 and GLM 5.3 Flash?
GLM 4.5: $0.0059 in / $0.0216 out per 1M tokens. GLM 5.3 Flash: $0.0009 in / $0.0029 out per 1M tokens. That's roughly a 86% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GLM 4.5 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.