GPT-6.1 Sol vs GPT-6 Luna: cost per task
GPT-6 Luna is cheaper on 14 of 14 tasks and about 18.1x cheaper on average (geometric mean). GPT-6.1 Sol has the higher LMArena Text score (1484 vs 1443).
| Task | GPT-6.1 Sol | GPT-6 Luna | Difference |
|---|---|---|---|
| Answer a chat question | 0.67¢ | 0.06¢ | 11.3x |
| Reply to a customer email | 0.18¢ | <0.01¢ | 24.4x |
| Write a 1,500-word blog post | 2.3¢ | 0.12¢ | 19.4x |
| Write 10 product descriptions | 1.2¢ | 0.05¢ | 22.9x |
| Translate 1,000 words | 1.6¢ | 0.08¢ | 19.3x |
| Proofread one page (500 words) | 0.81¢ | 0.04¢ | 17.9x |
| Summarize a 20-page PDF | 3.1¢ | 0.16¢ | 19.8x |
| Extract data from an invoice | 0.52¢ | 0.03¢ | 16.5x |
| Analyze a 200-row spreadsheet | 8.4¢ | 0.19¢ | 45.0x |
| Answer from 5 retrieved documents (RAG) | 1.2¢ | 0.05¢ | 21.9x |
| Classify 100 support tickets | 0.77¢ | 0.06¢ | 12.0x |
| Review 500 lines of code | 4.9¢ | 0.31¢ | 15.9x |
| Write a SQL query | 0.48¢ | 0.04¢ | 12.0x |
| Run a 50-step coding agent | 53¢ | 4.1¢ | 13.0x |
Specs and list prices
| GPT-6.1 Sol | GPT-6 Luna | |
|---|---|---|
| Input per 1M | $2.00 | $0.10 |
| Output per 1M | $10.00 | $0.50 |
| Cached input per 1M | $0.10 | $0.01 |
| Context | 1.05M | 1.05M |
| Providers | 8 | 7 |
| Reasoning | always | default |
| LMArena Text | 1484 | 1443 |
| Released | Sep 29, 2026 | Sep 22, 2026 |
FAQ
Is GPT-6.1 Sol or GPT-6 Luna cheaper?
GPT-6 Luna is cheaper on 14 of 14 tasks and about 18.1x cheaper on average (geometric mean). GPT-6.1 Sol has the higher LMArena Text score (1484 vs 1443).
How much does GPT-6.1 Sol cost compared to GPT-6 Luna per token?
GPT-6.1 Sol: $2.00 input and $10.00 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.