Gemini 3.1 Pro Preview vs GPT-6 Astra: cost per task
Gemini 3.1 Pro Preview is cheaper on 9 of 14 tasks and about 1.4x cheaper on average (geometric mean). On LMArena Text they are practically tied (1487 vs 1477, within the margin of error).
| Task | Gemini 3.1 Pro Preview | GPT-6 Astra | Difference |
|---|---|---|---|
| Answer a chat question | 2.1¢ | 3.4¢ | 1.6x |
| Reply to a customer email | 0.97¢ | 0.89¢ | 1.1x |
| Write a 1,500-word blog post | 5.0¢ | 11¢ | 2.3x |
| Write 10 product descriptions | 3.9¢ | 6.2¢ | 1.6x |
| Translate 1,000 words | 11¢ | 8.0¢ | 1.4x |
| Proofread one page (500 words) | 3.6¢ | 4.0¢ | 1.1x |
| Summarize a 20-page PDF | 4.6¢ | 16¢ | 3.4x |
| Extract data from an invoice | 3.2¢ | 2.6¢ | 1.2x |
| Analyze a 200-row spreadsheet | 7.5¢ | 42¢ | 5.6x |
| Answer from 5 retrieved documents (RAG) | 3.3¢ | 5.9¢ | 1.8x |
| Classify 100 support tickets | 9.4¢ | 3.9¢ | 2.4x |
| Review 500 lines of code | 11¢ | 24¢ | 2.1x |
| Write a SQL query | 3.2¢ | 2.4¢ | 1.3x |
| Run a 50-step coding agent | $1.95 | $3.72 | 1.9x |
Specs and list prices
| Gemini 3.1 Pro Preview | GPT-6 Astra | |
|---|---|---|
| Input per 1M | $2.00 | $10.00 |
| Output per 1M | $12.00 | $50.00 |
| Cached input per 1M | $0.20 | $1.00 |
| Context | 1M | 1.05M |
| Providers | 6 | 7 |
| Reasoning | always | always |
| LMArena Text | 1487 | 1477 |
| Released | Feb 19, 2026 | Sep 4, 2026 |
FAQ
Is Gemini 3.1 Pro Preview or GPT-6 Astra cheaper?
Gemini 3.1 Pro Preview is cheaper on 9 of 14 tasks and about 1.4x cheaper on average (geometric mean). On LMArena Text they are practically tied (1487 vs 1477, within the margin of error).
How much does Gemini 3.1 Pro Preview cost compared to GPT-6 Astra per token?
Gemini 3.1 Pro Preview: $2.00 input and $12.00 output per 1M tokens. GPT-6 Astra: $10.00 input and $50.00 output. Token prices alone mislead - models use different numbers of tokens for the same task, which is what the task table shows.