Verdict
Built from the measurements below
- Accuracy is too close to call: Llama 3.3 70B Instruct scored 42.5% and Solar Pro 4 45.0% on the same 80 questions, a gap within what chance alone could produce.
- Llama 3.3 70B Instruct is 3.4× cheaper per question as billed ($0.00053 vs $0.0018), reasoning tokens included.
- Solar Pro 4 generates text 2.2× faster: 91 tokens per second against 42.
- Solar Pro 4 starts answering sooner: 0.6 s to the first token, against 0.7 s for Llama 3.3 70B Instruct.
- Solar Pro 4 accepts more context: 524k tokens against 131k.
Which should you choose?
Choose Llama 3.3 70B Instruct for the lower cost per correct answer ($0.0013 against $0.0041), shorter outputs (about 855 tokens per question against 2,952), open weights you can run yourself and more hosts to choose from on OpenRouter (9 against 1). Choose Solar Pro 4 for faster streaming, a quicker first token and a 524k-token context window. The widest subject gap is in humanities & social science: Llama 3.3 70B Instruct answered 9 of 9 correctly, Solar Pro 4 6 of 9. With so few questions per subject, treat this as a lead to test on your own prompts, not a result.
Accuracy gap -2.5 points (z = -0.32). We call a winner only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.