Gemini 3.5 Flash Lite vs GPT-6 Astra: cost per task
Gemini 3.5 Flash Lite is cheaper on 14 of 14 tasks and about 10.0x cheaper on average (geometric mean). GPT-6 Astra has the higher LMArena Text score (1477 vs 1455).
| Task | Gemini 3.5 Flash Lite | GPT-6 Astra | Difference |
|---|---|---|---|
| Answer a chat question | 0.41¢ | 3.4¢ | 8.2x |
| Reply to a customer email | 0.15¢ | 0.89¢ | 6.1x |
| Write a 1,500-word blog post | 0.90¢ | 11¢ | 12.8x |
| Write 10 product descriptions | 0.74¢ | 6.2¢ | 8.3x |
| Translate 1,000 words | 1.2¢ | 8.0¢ | 6.9x |
| Proofread one page (500 words) | 0.30¢ | 4.0¢ | 13.6x |
| Summarize a 20-page PDF | 0.69¢ | 16¢ | 22.4x |
| Extract data from an invoice | 0.38¢ | 2.6¢ | 6.8x |
| Analyze a 200-row spreadsheet | 2.2¢ | 42¢ | 19.0x |
| Answer from 5 retrieved documents (RAG) | 0.65¢ | 5.9¢ | 9.1x |
| Classify 100 support tickets | 1.7¢ | 3.9¢ | 2.3x |
| Review 500 lines of code | 0.67¢ | 24¢ | 36.2x |
| Write a SQL query | 0.40¢ | 2.4¢ | 6.0x |
| Run a 50-step coding agent | 24¢ | $3.72 | 15.4x |
Specs and list prices
| Gemini 3.5 Flash Lite | GPT-6 Astra | |
|---|---|---|
| Input per 1M | $0.30 | $10.00 |
| Output per 1M | $2.50 | $50.00 |
| Cached input per 1M | $0.03 | $1.00 |
| Context | 1M | 1.05M |
| Providers | 8 | 7 |
| Reasoning | always | always |
| LMArena Text | 1455 | 1477 |
| Released | Jul 21, 2026 | Sep 4, 2026 |
FAQ
Is Gemini 3.5 Flash Lite or GPT-6 Astra cheaper?
Gemini 3.5 Flash Lite is cheaper on 14 of 14 tasks and about 10.0x cheaper on average (geometric mean). GPT-6 Astra has the higher LMArena Text score (1477 vs 1455).
How much does Gemini 3.5 Flash Lite cost compared to GPT-6 Astra per token?
Gemini 3.5 Flash Lite: $0.30 input and $2.50 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.