Verdict
Built from the measurements below
- Accuracy is too close to call: GPT-6 Sol scored 73.8% and o3 72.5% on the same 80 questions, a gap within what chance alone could produce.
- GPT-6 Sol is 3.7× cheaper per question as billed ($0.0024 vs $0.0088), reasoning tokens included.
- o3 generates text 1.8× faster: 163 tokens per second against 92.
- GPT-6 Sol starts answering sooner: 0.9 s to the first token, against 1.2 s for o3.
- GPT-6 Sol accepts more context: 1.1M tokens against 200k.
Which should you choose?
Choose GPT-6 Sol for the lower cost per correct answer ($0.0032 against $0.012), a quicker first token, shorter outputs (about 174 tokens per question against 1,025), a 1.1M-token context window and more hosts to choose from on OpenRouter (3 against 1). Choose o3 for faster streaming. The widest subject gap is in medicine: o3 answered 7 of 11 correctly, GPT-6 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 +1.3 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.