Rate
GPT-5.6 Luna vs GPT-6.1 Terra: price
GPT-5.6 Luna is 4.4× cheaper than GPT-6.1 Terra for a typical chat (1,500 tokens in, 500 out).
| Item | GPT-5.6 Luna | GPT-6.1 Terra |
|---|---|---|
| Input per 1M tokens | $0.20 | $1.00 |
| Output per 1M tokens | $1.20 | $5.00 |
| Cached input per 1M | $0.02 | $0.05 |
| 1,000 chat messages1,500 tokens in, 500 out each | $0.90 | $4.00 |
| Summarize a 50-page PDF30,000 tokens in, 1,000 out | $0.0072 | $0.035 |
| One coding-agent task60,000 tokens in, 4,000 out, no caching | $0.017 | $0.08 |
GPT-6.1 Terra: Prompts over 272K tokens: 2x input, 1.5x output.
List prices checked November 5, 2026. Price is half the story: see how people rate each one today.
GPT-5.6 Luna vs GPT-6.1 Terra in numbers
Output, usually the bigger part of the bill, costs $1.20 on GPT-5.6 Luna and $5.00 on GPT-6.1 Terra, so GPT-5.6 Luna is 4.2× cheaper there. Input costs $0.20 versus $1.00 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 $0.08 on GPT-6.1 Terra. Both accept up to 1.05M tokens of context. GPT-5.6 Luna came out on July 9, 2026 and GPT-6.1 Terra on October 26, 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-6.1 TerraOpenAI–no votes yet
Frequently asked questions
Is GPT-5.6 Luna or GPT-6.1 Terra cheaper?
GPT-5.6 Luna is 4.4× cheaper than GPT-6.1 Terra for a typical chat (1,500 tokens in, 500 out). Output, usually the bigger part of the bill, costs $1.20 on GPT-5.6 Luna and $5.00 on GPT-6.1 Terra, so GPT-5.6 Luna is 4.2× cheaper there.
Which is better, GPT-5.6 Luna or GPT-6.1 Terra?
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-6.1 Terra pages, and read what users report in Discussions.