Rate
GPT-5.6 Luna vs GPT-5.6 Sol: price
GPT-5.6 Luna is 25.0× cheaper than GPT-5.6 Sol for a typical chat workload (1,500 tokens in, 500 out).
| Item | GPT-5.6 Luna | GPT-5.6 Sol |
|---|---|---|
| Input per 1M tokens | $0.20 | $5.00 |
| Output per 1M tokens | $1.20 | $30.00 |
| Cached input per 1M | $0.02 | $0.50 |
| 1,000 chat messages1,500 tokens in, 500 out each | $0.90 | $22.50 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.0072 | $0.18 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.017 | $0.42 |
GPT-5.6 Sol: Main pricing page lists $5 / $30. OpenAI's model page shows a promotional $4 / $20. Prompts over 272K tokens: 2x input, 1.5x output.
List prices checked September 28, 2026. Price is half the story: see how people rate each one today.
GPT-5.6 Luna vs GPT-5.6 Sol in numbers
Output, usually the bigger part of the bill, costs $1.20 on GPT-5.6 Luna and $30.00 on GPT-5.6 Sol, so GPT-5.6 Luna is 25.0× cheaper there. Input costs $0.20 versus $5.00 per million tokens. For a coding-agent task (60,000 tokens in, 4,000 out) that is $0.017 on GPT-5.6 Luna and $0.42 on GPT-5.6 Sol. Both accept up to 1.05M tokens of context. GPT-5.6 Luna came out on July 9, 2026 and GPT-5.6 Sol on July 9, 2026.
Both are OpenAI models. Estimate your own bill for both in the cost calculator.
Which one feels dumber today?
- GPT-5.6 LunaOpenAI
–no votes yet - GPT-5.6 SolOpenAI–no votes yet
Frequently asked questions
Is GPT-5.6 Luna or GPT-5.6 Sol cheaper?
GPT-5.6 Luna is 25.0× cheaper than GPT-5.6 Sol for a typical chat workload (1,500 tokens in, 500 out). Output, usually the bigger part of the bill, costs $1.20 on GPT-5.6 Luna and $30.00 on GPT-5.6 Sol, so GPT-5.6 Luna is 25.0× cheaper there.
Which is better, GPT-5.6 Luna or GPT-5.6 Sol?
It depends on the task, and price is only part of it. Check how people rate each one today on the GPT-5.6 Luna and GPT-5.6 Sol pages, and read what users report in Discussions.