Verdict
Built from the measurements below
- Accuracy is too close to call: Gemini 3.5 Flash Lite scored 75.0% and GPT-6.1 Sol 76.2% on the same 80 questions, a gap within what chance alone could produce.
- GPT-6.1 Sol is 1.2× cheaper per question as billed ($0.0029 vs $0.0034), reasoning tokens included.
- Gemini 3.5 Flash Lite generates text 9.9× faster: 409 tokens per second against 41.
- Gemini 3.5 Flash Lite starts answering sooner: 1.1 s to the first token, against 2.1 s for GPT-6.1 Sol.
Which should you choose?
Choose Gemini 3.5 Flash Lite for faster streaming and a quicker first token. Choose GPT-6.1 Sol for the lower cost per correct answer ($0.0037 against $0.0045) and shorter outputs (about 224 tokens per question against 1,311). The widest subject gap is in medicine: Gemini 3.5 Flash Lite answered 7 of 11 correctly, GPT-6.1 Sol 5 of 11. With so few questions per subject, treat this as a lead to test on your own prompts, not a result.
Accuracy gap -1.2 points (z = -0.18). We call a winner only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.