Solar System
loads medium
Tech. quality98
UX87
Time1 min 19 s
Cost$0.12
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GPT-5.6 Terra
Loads without errors4/5#12 of 26
Tech. quality95/100#9 of 26
UX85/100#13 of 26
Total cost$0.52
Average time1 min 09 s#4 of 26
Total tokens45,078
API price: $2 / $12 per 1M input / output tokens · as of 17/10/2026 source ↗
What is GPT-5.6 Terra good for?
The GPT-5.6 model that balances intelligence and cost.
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 Terra do in the AI Lab tests?
- 4 of 5 outputs load without errors; 1 more ran after one fix by the same model.
- Its best technical result was on the “Monitor test” prompt (100/100).
- Did not work (original output): New York & Central Park map.
- It implemented the chess rules flawlessly – passing the objective perft test on all 6 positions.
- Average time per prompt 1 min 09 s#4 of 26
- Average cost per prompt $0.10#12 of 26
- Technical quality 95/100#9 of 26
- Automatic UX rating 85/100#13 of 26
Outputs
All outputs of GPT-5.6 Terra on the 5 prompts every other model got as well.
GTA-style game
loads medium
Tech. quality99
UX100
Time49 s
Cost$0.079
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Monitor test
loads medium
Tech. quality100
UX77
Time54 s
Cost$0.083
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New York & Central Park map
broken medium fixed version →
Tech. quality82
UX72
Time1 min 26 s
Cost$0.12
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Chess with an engine
loads medium
Tech. quality97
UX87
Time1 min 15 s
Cost$0.11
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.