GPT-6 Luna vs Mistral Small 4: cost per task
GPT-6 Luna is cheaper on 14 of 14 tasks and about 4.5x cheaper on average (geometric mean).
| Task | GPT-6 Luna | Mistral Small 4 | Difference |
|---|---|---|---|
| Answer a chat question | 0.06¢ | 0.08¢ | 1.4x |
| Reply to a customer email | <0.01¢ | 0.22¢ | 29.7x |
| Write a 1,500-word blog post | 0.12¢ | 0.47¢ | 3.9x |
| Write 10 product descriptions | 0.05¢ | 0.19¢ | 3.5x |
| Translate 1,000 words | 0.08¢ | 0.75¢ | 9.0x |
| Proofread one page (500 words) | 0.04¢ | 0.26¢ | 5.8x |
| Summarize a 20-page PDF | 0.16¢ | 0.33¢ | 2.1x |
| Extract data from an invoice | 0.03¢ | 0.16¢ | 5.2x |
| Analyze a 200-row spreadsheet | 0.19¢ | 0.71¢ | 3.8x |
| Answer from 5 retrieved documents (RAG) | 0.05¢ | 0.25¢ | 4.6x |
| Classify 100 support tickets | 0.06¢ | 0.46¢ | 7.2x |
| Review 500 lines of code | 0.31¢ | 0.62¢ | 2.0x |
| Write a SQL query | 0.04¢ | 0.19¢ | 4.7x |
| Run a 50-step coding agent | 4.1¢ | 13¢ | 3.3x |
Specs and list prices
| GPT-6 Luna | Mistral Small 4 | |
|---|---|---|
| Input per 1M | $0.10 | $0.15 |
| Output per 1M | $0.50 | $0.60 |
| Cached input per 1M | $0.01 | $0.015 |
| Context | 1.05M | 262K |
| Providers | 7 | 4 |
| Reasoning | default | default |
| LMArena Text | 1443 | - |
| Released | Sep 22, 2026 | Mar 16, 2026 |
FAQ
Is GPT-6 Luna or Mistral Small 4 cheaper?
GPT-6 Luna is cheaper on 14 of 14 tasks and about 4.5x cheaper on average (geometric mean).
How much does GPT-6 Luna cost compared to Mistral Small 4 per token?
GPT-6 Luna: $0.10 input and $0.50 output per 1M tokens. Mistral Small 4: $0.15 input and $0.60 output. Token prices alone mislead - models use different numbers of tokens for the same task, which is what the task table shows.