Verdict
Built from the measurements below
- Accuracy is too close to call: GLM 5.3 Flash scored 67.5% and MiniMax M3.1 Flash 66.2% on the same 80 questions, a gap within what chance alone could produce.
- GLM 5.3 Flash is 6.0× cheaper per question as billed ($0.00015 vs $0.00087), reasoning tokens included.
- MiniMax M3.1 Flash generates text 1.6× faster: 131 tokens per second against 83.
Which should you choose?
Choose GLM 5.3 Flash for the lower cost per correct answer ($0.00022 against $0.0013), shorter outputs (about 560 tokens per question against 1,376) and more hosts to choose from on OpenRouter (34 against 11). Choose MiniMax M3.1 Flash for faster streaming. The widest subject gap is in law: GLM 5.3 Flash answered 4 of 6 correctly, MiniMax M3.1 Flash 2 of 6. 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 = 0.17). We call a winner only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.