Claude Fable 5.1 vs Gemini 3.1 Flash Lite: cost per task
Gemini 3.1 Flash Lite is cheaper on 14 of 14 tasks and about 28.1x cheaper on average (geometric mean).
| Task | Claude Fable 5.1 | Gemini 3.1 Flash Lite | Difference |
|---|---|---|---|
| Answer a chat question | 6.3¢ | 0.25¢ | 25.8x |
| Reply to a customer email | 2.0¢ | 0.09¢ | 22.2x |
| Write a 1,500-word blog post | 18¢ | 0.54¢ | 33.9x |
| Write 10 product descriptions | 22¢ | 0.45¢ | 49.2x |
| Translate 1,000 words | 13¢ | 0.70¢ | 18.2x |
| Proofread one page (500 words) | 5.6¢ | 0.18¢ | 30.5x |
| Summarize a 20-page PDF | 22¢ | 0.51¢ | 44.1x |
| Extract data from an invoice | 5.2¢ | 0.23¢ | 22.1x |
| Analyze a 200-row spreadsheet | 85¢ | 1.4¢ | 62.1x |
| Answer from 5 retrieved documents (RAG) | 14¢ | 0.42¢ | 32.9x |
| Classify 100 support tickets | 4.5¢ | 1.0¢ | 4.3x |
| Review 500 lines of code | 40¢ | 0.44¢ | 90.3x |
| Write a SQL query | 5.5¢ | 0.24¢ | 22.6x |
| Run a 50-step coding agent | $3.46 | 17¢ | 20.9x |
Specs and list prices
| Claude Fable 5.1 | Gemini 3.1 Flash Lite | |
|---|---|---|
| Input per 1M | $10.00 | $0.25 |
| Output per 1M | $50.00 | $1.50 |
| Cached input per 1M | $0.25 | $0.025 |
| Context | 1M | 1M |
| Providers | 4 | 8 |
| Reasoning | always | default |
| LMArena Text | 1502 | - |
| Released | Sep 1, 2026 | May 7, 2026 |
FAQ
Is Claude Fable 5.1 or Gemini 3.1 Flash Lite cheaper?
Gemini 3.1 Flash Lite is cheaper on 14 of 14 tasks and about 28.1x cheaper on average (geometric mean).
How much does Claude Fable 5.1 cost compared to Gemini 3.1 Flash Lite per token?
Claude Fable 5.1: $10.00 input and $50.00 output per 1M tokens. Gemini 3.1 Flash Lite: $0.25 input and $1.50 output. Token prices alone mislead - models use different numbers of tokens for the same task, which is what the task table shows.