GPT-5.4 vs GPT-6 Luna
openai/gpt-5.4 · openai/gpt-6-luna
As of November 3, 2026, GPT-6 Luna is the cheaper API on UberLLM: $0.0400 per million input tokens and $0.1998 per million output, versus $0.0611 / $0.3664 for GPT-5.4, about 45% 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-6 Luna to cut cost; choose GPT-5.4 when its capabilities fit your task better.
GPT-5.4 vs GPT-6 Luna, side by side
| Spec | GPT-5.4 | GPT-6 Luna |
|---|---|---|
| Price · input / 1M | $0.0611 | $0.0400 |
| Price · output / 1M | $0.3664 | $0.1998 |
| Context length | 1,000,000 | 1,050,000 |
| Max output tokens | 131,072 | 128,000 |
| Input modalities | text, image | text, image, file |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 97.6% off | 60% off |
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?
GPT-5.4 vs GPT-6 Luna — FAQ
Is GPT-5.4 or GPT-6 Luna cheaper?
GPT-6 Luna is cheaper on a blended token mix, by about 45%. 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 and GPT-6 Luna?
GPT-5.4: $0.0611 in / $0.3664 out per 1M tokens. GPT-6 Luna: $0.0400 in / $0.1998 out per 1M tokens. That's roughly a 45% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GPT-5.4 and GPT-6 Luna 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.