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GPT-5.6 Luna vs GPT-6 Luna: price
GPT-6 Luna is 2.3× cheaper than GPT-5.6 Luna for a typical chat workload (1,500 tokens in, 500 out).
| Item | GPT-5.6 Luna | GPT-6 Luna |
|---|---|---|
| Input per 1M tokens | $0.20 | $0.10 |
| Output per 1M tokens | $1.20 | $0.50 |
| Cached input per 1M | $0.02 | $0.01 |
| 1,000 chat messages1,500 tokens in, 500 out each | $0.90 | $0.40 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.0072 | $0.0035 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.017 | $0.0080 |
List prices checked September 28, 2026. Price is half the story: see how people rate each one today.
GPT-5.6 Luna vs GPT-6 Luna in numbers
Output, usually the bigger part of the bill, costs $1.20 on GPT-5.6 Luna and $0.50 on GPT-6 Luna, so GPT-6 Luna is 2.4× cheaper there. Input costs $0.20 versus $0.10 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 $0.0080 on GPT-6 Luna. Both accept up to 1.05M tokens of context. GPT-5.6 Luna came out on July 9, 2026 and GPT-6 Luna on September 22, 2026.
GPT-5.6 Luna is made by OpenAI; GPT-6 Luna by OpenAI. Estimate your own bill for both in the cost calculator.
Which one feels dumber today?
- GPT-5.6 LunaOpenAI
–no votes yet - GPT-6 LunaOpenAI–no votes yet
Frequently asked questions
Is GPT-5.6 Luna or GPT-6 Luna cheaper?
GPT-6 Luna is 2.3× cheaper than GPT-5.6 Luna 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 $0.50 on GPT-6 Luna, so GPT-6 Luna is 2.4× cheaper there.
Which is better, GPT-5.6 Luna 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 Luna and GPT-6 Luna pages, and read what users report in Discussions.