Rate
Gemini 3.1 Pro vs GPT-6 Luna: price
GPT-6 Luna is 22.5× cheaper than Gemini 3.1 Pro for a typical chat workload (1,500 tokens in, 500 out).
| Item | Gemini 3.1 Pro | GPT-6 Luna |
|---|---|---|
| Input per 1M tokens | $2.00 | $0.10 |
| Output per 1M tokens | $12.00 | $0.50 |
| Cached input per 1M | $0.20 | $0.01 |
| 1,000 chat messages1,500 tokens in, 500 out each | $9.00 | $0.40 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.072 | $0.0035 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.168 | $0.0080 |
List prices checked September 28, 2026. Price is half the story: see how people rate each one today.
Gemini 3.1 Pro vs GPT-6 Luna in numbers
Output, usually the bigger part of the bill, costs $12.00 on Gemini 3.1 Pro and $0.50 on GPT-6 Luna, so GPT-6 Luna is 24.0× cheaper there. Input costs $2.00 versus $0.10 per million tokens. For a coding-agent task (60,000 tokens in, 4,000 out) that is $0.168 on Gemini 3.1 Pro and $0.0080 on GPT-6 Luna. Gemini 3.1 Pro accepts 1.05M tokens of context and GPT-6 Luna 1.05M tokens. Gemini 3.1 Pro came out on February 19, 2026 and GPT-6 Luna on September 22, 2026.
Gemini 3.1 Pro is made by Google; GPT-6 Luna by OpenAI. Estimate your own bill for both in the cost calculator.
Which one feels dumber today?
- Gemini 3.1 ProGoogle
–no votes yet - GPT-6 LunaOpenAI–no votes yet
Frequently asked questions
Is Gemini 3.1 Pro or GPT-6 Luna cheaper?
GPT-6 Luna is 22.5× cheaper than Gemini 3.1 Pro for a typical chat workload (1,500 tokens in, 500 out). Output, usually the bigger part of the bill, costs $12.00 on Gemini 3.1 Pro and $0.50 on GPT-6 Luna, so GPT-6 Luna is 24.0× cheaper there.
Which is better, Gemini 3.1 Pro or GPT-6 Luna?
It depends on the task, and price is only part of it. Check how people rate each one today on the Gemini 3.1 Pro and GPT-6 Luna pages, and read what users report in Discussions.