Rate
GPT-5.6 Sol vs GPT-6 Luna: price
GPT-6 Luna is 56.2× cheaper than GPT-5.6 Sol for a typical chat workload (1,500 tokens in, 500 out).
| Item | GPT-5.6 Sol | GPT-6 Luna |
|---|---|---|
| Input per 1M tokens | $5.00 | $0.10 |
| Output per 1M tokens | $30.00 | $0.50 |
| Cached input per 1M | $0.50 | $0.01 |
| 1,000 chat messages1,500 tokens in, 500 out each | $22.50 | $0.40 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.18 | $0.0035 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.42 | $0.0080 |
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 Sol vs GPT-6 Luna in numbers
Output, usually the bigger part of the bill, costs $30.00 on GPT-5.6 Sol and $0.50 on GPT-6 Luna, so GPT-6 Luna is 60.0× cheaper there. Input costs $5.00 versus $0.10 per million tokens. For a coding-agent task (60,000 tokens in, 4,000 out) that is $0.42 on GPT-5.6 Sol and $0.0080 on GPT-6 Luna. Both accept up to 1.05M tokens of context. GPT-5.6 Sol came out on July 9, 2026 and GPT-6 Luna on September 22, 2026.
Both are OpenAI models. Estimate your own bill for both in the cost calculator.
Which one feels dumber today?
- GPT-5.6 SolOpenAI
–no votes yet - GPT-6 LunaOpenAI–no votes yet
Frequently asked questions
Is GPT-5.6 Sol or GPT-6 Luna cheaper?
GPT-6 Luna is 56.2× 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 $30.00 on GPT-5.6 Sol and $0.50 on GPT-6 Luna, so GPT-6 Luna is 60.0× cheaper there.
Which is better, GPT-5.6 Sol or GPT-6 Luna?
It depends on the task, and price is only part of it. Check how people rate each one today on the GPT-5.6 Sol and GPT-6 Luna pages, and read what users report in Discussions.