OpenAI
GPT-5.6 Sol
closed weights Undisclosed Released Aug 2026 this query ≈ $0.0019 in $2.00/M out $10.00/M OpenRouter ↗
For GPT-5.6 OpenAI shipped two flavours, Sol and Terra, plus “pro” reasoning modes on top. Sol is the brighter-named twin. It knew the answer cold but made Mats work for it — the opening line was a drumroll, not a verdict.
How it did
10.0/10
checks 9.2 · judge +0.8
- Kills the diesel assumption early +3
- Leads with the answer or a warning +2.5
- Says 95 +2.5
- Brief enough to read at the pump +0.7
- Explains 98 is unnecessary +0.5
- Clocks the Portuguese context
Certified Mats Advisor
““Don't fill it until you confirm” is the single safest opener on the board. Compact, local (combustível), and it offers to identify a photo.” — the judge