Verdict
Built from the measurements below
- Accuracy is too close to call: DeepSeek V4 Flash Vision Exp scored 71.2% and DeepSeek V4 Pro 0813 71.2% on the same 80 questions, a gap within what chance alone could produce.
- DeepSeek V4 Flash Vision Exp is 3.4× cheaper per question as billed ($0.0011 vs $0.0036), reasoning tokens included.
- DeepSeek V4 Flash Vision Exp generates text 3.0× faster: 170 tokens per second against 56.
Which should you choose?
Choose DeepSeek V4 Flash Vision Exp for the lower cost per correct answer ($0.0015 against $0.0051) and faster streaming. Choose DeepSeek V4 Pro 0813 for more hosts to choose from on OpenRouter (23 against 3). The widest subject gap is in law: DeepSeek V4 Pro 0813 answered 4 of 6 correctly, DeepSeek V4 Flash Vision Exp 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 +0.0 points (z = 0.00). We call a winner only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.