Solar System
broken medium fixed version →
Tech. quality79
UX64
Time43 s
Cost$0.00687
Compare →
GPT-5.6 Luna
Loads without errors2/5#24 of 26
Tech. quality78/100#25 of 26
UX76/100#25 of 26
Total cost$0.034
Average time41 s#2 of 26
Total tokens30,369
API price: $0.2 / $1.2 per 1M input / output tokens · as of 17/10/2026 source ↗
What is GPT-5.6 Luna good for?
The GPT-5.6 model optimised for cost-sensitive workloads.
Description based on the maker · source ↗
- Maker
- OpenAI
- Released
- 09/07/2026
- Model weights
- closed, the model is available through the API only
- Reasoning levels
- low medium high
How did GPT-5.6 Luna do in the AI Lab tests?
- 2 of 5 outputs load without errors.
- Its best technical result was on the “Monitor test” prompt (88/100).
- Did not work (original output): Solar System, GTA-style game, Chess with an engine.
- Average time per prompt 41 s#2 of 26
- Average cost per prompt $0.00688#3 of 26
- Technical quality 78/100#25 of 26
- Automatic UX rating 76/100#25 of 26
Outputs
All outputs of GPT-5.6 Luna on the 5 prompts every other model got as well.
GTA-style game
broken medium fixed version →
Tech. quality81
UX80
Time35 s
Cost$0.00598
Compare →
Monitor test
loads medium
Tech. quality88
UX95
Time33 s
Cost$0.00537
Compare →
New York & Central Park map
loads medium
Tech. quality64
UX66
Time48 s
Cost$0.00782
Compare →
Chess with an engine
broken medium fixed version →
Tech. quality79
UX74
Time48 s
Cost$0.00837
Compare →
Cost = tokens priced with the API price list valid on the date shown next to the cost (prices change). ≈ = estimate (only the total token count is known), no ≈ = exact from input / output tokens. “Loads” = the page opens without errors; technical quality also checks behaviour during use – judge the quality in the viewer.