GPT-5.6 Luna vs GLM 5.3
openai/gpt-5.6-luna · z-ai/glm-5.3
As of November 2, 2026, GPT-5.6 Luna is the cheaper API on UberLLM: $0.0020 per million input tokens and $0.0121 per million output, versus $0.0104 / $0.0327 for GLM 5.3, about 65% 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 GPT-5.6 Luna to cut cost; choose GLM 5.3 when its capabilities fit your task better.
GPT-5.6 Luna vs GLM 5.3, side by side
| Spec | GPT-5.6 Luna | GLM 5.3 |
|---|---|---|
| Price · input / 1M | $0.0020 | $0.0104 |
| Price · output / 1M | $0.0121 | $0.0327 |
| Context length | 1,050,000 | 1,000,000 |
| Max output tokens | 128,000 | 131,072 |
| Input modalities | text, image, file | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | — |
| Reasoning | Yes | Yes |
| % off list | 99% off | 98.7% off |
| First token, median (7 days) | — | 3.8 s (517 requests) |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 2, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GPT-5.6 Luna vs GLM 5.3 — FAQ
Is GPT-5.6 Luna or GLM 5.3 cheaper?
GPT-5.6 Luna is cheaper on a blended token mix, by about 65%. 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-5.6 Luna and GLM 5.3?
GPT-5.6 Luna: $0.0020 in / $0.0121 out per 1M tokens. GLM 5.3: $0.0104 in / $0.0327 out per 1M tokens. That's roughly a 65% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GPT-5.6 Luna 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.