Gemini 3.1 Flash Lite vs GPT-6 Luna: cost per task
GPT-6 Luna is cheaper on 14 of 14 tasks and about 5.8x cheaper on average (geometric mean).
| Task | Gemini 3.1 Flash Lite | GPT-6 Luna | Difference |
|---|---|---|---|
| Answer a chat question | 0.25¢ | 0.06¢ | 4.1x |
| Reply to a customer email | 0.09¢ | <0.01¢ | 12.3x |
| Write a 1,500-word blog post | 0.54¢ | 0.12¢ | 4.5x |
| Write 10 product descriptions | 0.45¢ | 0.05¢ | 8.3x |
| Translate 1,000 words | 0.70¢ | 0.08¢ | 8.5x |
| Proofread one page (500 words) | 0.18¢ | 0.04¢ | 4.1x |
| Summarize a 20-page PDF | 0.51¢ | 0.16¢ | 3.2x |
| Extract data from an invoice | 0.23¢ | 0.03¢ | 7.3x |
| Analyze a 200-row spreadsheet | 1.4¢ | 0.19¢ | 7.3x |
| Answer from 5 retrieved documents (RAG) | 0.42¢ | 0.05¢ | 7.7x |
| Classify 100 support tickets | 1.0¢ | 0.06¢ | 16.0x |
| Review 500 lines of code | 0.44¢ | 0.31¢ | 1.4x |
| Write a SQL query | 0.24¢ | 0.04¢ | 6.0x |
| Run a 50-step coding agent | 17¢ | 4.1¢ | 4.1x |
Specs and list prices
| Gemini 3.1 Flash Lite | GPT-6 Luna | |
|---|---|---|
| Input per 1M | $0.25 | $0.10 |
| Output per 1M | $1.50 | $0.50 |
| Cached input per 1M | $0.025 | $0.01 |
| Context | 1M | 1.05M |
| Providers | 8 | 7 |
| Reasoning | default | default |
| LMArena Text | - | 1443 |
| Released | May 7, 2026 | Sep 22, 2026 |
FAQ
Is Gemini 3.1 Flash Lite or GPT-6 Luna cheaper?
GPT-6 Luna is cheaper on 14 of 14 tasks and about 5.8x cheaper on average (geometric mean).
How much does Gemini 3.1 Flash Lite cost compared to GPT-6 Luna per token?
Gemini 3.1 Flash Lite: $0.25 input and $1.50 output per 1M tokens. GPT-6 Luna: $0.10 input and $0.50 output. Token prices alone mislead - models use different numbers of tokens for the same task, which is what the task table shows.