Gemini 3.1 Flash-Lite vs GPT-6 Luna
Google vs OpenAI · prices and specs, line by line
Gemini 3.1 Flash-Lite (Google) vs GPT-6 Luna (OpenAI), side by side: input/output/cache-hit prices, time-based pricing, context window, modalities and a fixed-assumption monthly cost. Green marks the better row.
| Dimension | Gemini 3.1 Flash-Lite | GPT-6 Luna |
|---|---|---|
| Vendor / channel | OpenAI | |
| Context window | 1024K | 1050K |
| Modalities | Text, Image understanding, Video understanding | Text, Image understanding |
| Features | High-volume light tasks, Translation & data processing | Low cost at scale, Efficient, lightweight |
| Input (cache miss) | $0.25 | Input ≤272K $0.1 Input >272K (long context) not published |
| Output | $1.5 | Input ≤272K $0.5 Input >272K (long context) not published |
| Cache hit | $0.025 | Input ≤272K $0.01 Input >272K (long context) not published |
| Time-based pricing | ||
| Est. monthly cost* | $4.69 | $1.64 |
| Price source | Google AI pricing | OpenAI API pricing |
| Verified | 2026-10-28 | 2026-10-28 |
* Fixed assumptions for the example monthly cost: 100 calls/day · 2,000 input / 800 output tokens per call · off-peak rates · 30% cache hit rate · 30-day month — the same formula and defaults as the cost calculator. USD models are converted to CNY at the reference rate for comparison (see summary). Costs within display precision are marked tied; neither side is favored.
Comparison summary (fixed usage basis)
- Estimated monthly cost: Gemini 3.1 Flash-Lite ¥31.54 vs GPT-6 Luna ¥11.00 on a common CNY basis (list prices $4.69 / $1.64) — at this fixed usage, GPT-6 Luna is cheaper by ¥20.54/month.
- Cost ratio: under this basis, Gemini 3.1 Flash-Lite costs about 2.9× GPT-6 Luna (GPT-6 Luna is ~65% cheaper). The ratio holds only at the current list prices, reference rate and fixed usage assumptions; it says nothing about capability, output quality or overall value.
- Input unit price (off-peak / single-price basis): list prices $0.25 vs $0.1; after conversion GPT-6 Luna is lower (by ≈ ¥1.01/1M tokens).
- Output unit price (off-peak / single-price basis): list prices $1.5 vs $0.5; after conversion GPT-6 Luna is lower (by ≈ ¥6.72/1M tokens).
- Cache-hit price (off-peak basis): Gemini 3.1 Flash-Lite $0.025; GPT-6 Luna $0.01.
- Context window: Gemini 3.1 Flash-Lite 1024K vs GPT-6 Luna 1050K — GPT-6 Luna is 1.0× Gemini 3.1 Flash-Lite.
- Modalities: Gemini 3.1 Flash-Lite=Text, Image understanding, Video understanding; GPT-6 Luna=Text, Image understanding (Gemini 3.1 Flash-Lite adds Video understanding).
- Price sources: Google AI pricing (verified 2026-10-28), OpenAI API pricing (verified 2026-10-28); unit: official list price per 1M tokens (Gemini 3.1 Flash-Lite in USD, GPT-6 Luna in USD).
These are computations from published list prices under fixed call volume, token usage, cache assumptions and billing rules. They are not rankings of capability, output quality or overall value, and do not constitute purchase advice.