Gemini 3.1 Flash-Lite vs GPT-6 Luna API pricing
GPT-6 Luna is cheaper on every example workload below. Prices last checked 2026-10-14.
| Gemini 3.1 Flash-Lite (Google) | GPT-6 Luna (OpenAI) | |
|---|---|---|
| Input $/1M tokens | $0.25 | $0.1 |
| Output $/1M tokens | $1.5 | $0.5 |
| Context | — | — |
| Our tier (1–4) | 1 | 1 |
Example monthly bills
| Workload | Gemini 3.1 Flash-Lite | GPT-6 Luna | Cheaper |
|---|---|---|---|
| Chat / Q&A 10M in / 2M out per month | $5.50 | $2.00 | GPT-6 Luna saves $3.50/mo (64%) |
| Coding 20M in / 5M out per month | $12.50 | $4.50 | GPT-6 Luna saves $8.00/mo (64%) |
| Output-heavy (reasoning, long answers) 10M in / 10M out per month | $17.50 | $6.00 | GPT-6 Luna saves $11.50/mo (66%) |
Fine print
- Gemini 3.1 Flash-Lite: Text/image/video input
- GPT-6 Luna: ≤272K input
Cost only, not quality. “Tier” is our rough capability judgment, not a benchmark, and different tokenizers count the same text differently. Reasoning models may bill extra thinking tokens as output. Official sources: Google, OpenAI.
See all models on the full price table, the Google and OpenAI pricing pages, or try the savings calculator with your own numbers.