GLM-5.3 Flash (greenference) vs GPT-6 Luna
GLM-5.3 Flash (greenference) is cheaper on output tokens, while GPT-6 Luna offers a larger context window. Choose GLM-5.3 Flash (greenference) or GPT-6 Luna based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GLM-5.3 Flash (greenference) | GPT-6 Luna |
|---|---|---|
| Provider | LLM Gateway | OpenAI |
| Input / 1M tokens | $0.14 | $0.10 |
| Output / 1M tokens | $0.49 | $0.50 |
| Context window | 1M | 1.1M |
| Parameters | — | — |
| Open weights | Yes | — |
| Released | Aug 2026 | — |
| GPQA Diamond score | — | 90.5 |
| LMArena (Chatbot Arena) Elo score | — | 1389 |
| LMArena WebDev Elo score | — | 1578 |
| LMArena Vision Elo score | — | 1216 |
| Epoch Capabilities Index score | — | 157 |
FAQ
Is GLM-5.3 Flash (greenference) or GPT-6 Luna cheaper?
GLM-5.3 Flash (greenference) is cheaper on output tokens ($0.49 vs $0.50 per 1M).
Which has the larger context window, GLM-5.3 Flash (greenference) or GPT-6 Luna?
GPT-6 Luna has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.