GPT-5.6 Luna vs GPT-6 Luna API pricing
GPT-6 Luna is cheaper on every example workload below. Prices last checked 2026-10-15.
| GPT-5.6 Luna (OpenAI) | GPT-6 Luna (OpenAI) | |
|---|---|---|
| Input $/1M tokens | $0.2 | $0.1 |
| Output $/1M tokens | $1.2 | $0.5 |
| Context | — | — |
| Our tier (1–4) | 1 | 1 |
Example monthly bills
| Workload | GPT-5.6 Luna | GPT-6 Luna | Cheaper |
|---|---|---|---|
| Chat / Q&A 10M in / 2M out per month | $4.40 | $2.00 | GPT-6 Luna saves $2.40/mo (55%) |
| Coding 20M in / 5M out per month | $10.00 | $4.50 | GPT-6 Luna saves $5.50/mo (55%) |
| Output-heavy (reasoning, long answers) 10M in / 10M out per month | $14.00 | $6.00 | GPT-6 Luna saves $8.00/mo (57%) |
Fine print
- GPT-5.6 Luna: ≤272K input; long context $0.40/$1.80
- GPT-6 Luna: ≤272K input
Cost only, not quality. “Tier” is our rough capability judgment, not a benchmark, and different tokenizers count the same text differently. Reasoning models may bill extra thinking tokens as output. Official sources: OpenAI, OpenAI.
See all models on the full price table, the OpenAI and OpenAI pricing pages, or try the savings calculator with your own numbers.