GPT-5.4 Pro vs GLM 5.1
openai/gpt-5.4-pro · z-ai/glm-5.1
As of October 31, 2026, GLM 5.1 is the cheaper API on UberLLM: $0.0693 per million input tokens and $0.2178 per million output, versus $19.04 / $114.21 for GPT-5.4 Pro, about 100% less when output is 3 tokens for every input token. These are the median prices buyers paid over the last 24 hours. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose GLM 5.1 to cut cost; choose GPT-5.4 Pro when context size wins. GPT-5.4 Pro carries the larger context window (1,000,000 vs 200,000 tokens), which can matter for long-document work.
GPT-5.4 Pro vs GLM 5.1, side by side
| Spec | GPT-5.4 Pro | GLM 5.1 |
|---|---|---|
| Price · input / 1M | $19.04 | $0.0693 |
| Price · output / 1M | $114.21 | $0.2178 |
| Context length | 1,000,000 | 200,000 |
| Max output tokens | 128,000 | 24,000 |
| Input modalities | text, image | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | — |
| Reasoning | Yes | Yes |
| % off list | 37% off | 95% off |
Median prices buyers paid on UberLLM over the last 24 hours. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated October 31, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GPT-5.4 Pro vs GLM 5.1 — FAQ
Is GPT-5.4 Pro or GLM 5.1 cheaper?
GLM 5.1 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 GPT-5.4 Pro and GLM 5.1?
GPT-5.4 Pro: $19.04 in / $114.21 out per 1M tokens. GLM 5.1: $0.0693 in / $0.2178 out per 1M tokens. That's roughly a 100% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GPT-5.4 Pro and GLM 5.1 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.