DeepSeek V4.1 Flash · Math
DeepSeek V4.1 Flash for math: our test runs
DeepSeek V4.1 Flash ran our 5 math prompts in llmwise, through the same pipeline your messages take. Here's every reply as it came, whether it passed, what it cost and what it counts as on Pro, next to the other models.
Based on 5 of our test runs on , through OpenRouter with the app's own prompt and settings.
Short answer
In our test runs on September 27, 2026, DeepSeek V4.1 Flash passed 5 of 5 of our math prompts (both hard ones): tied 1st of 15 models. Each reply counted as 1 message on Pro, where it has 60 a day, and cost $0.0002 to run on average.
Prompt by prompt
Each of the 5 math prompts, and how DeepSeek V4.1 Flash's reply did.
| Prompt | Result | Cost | Time |
|---|---|---|---|
| A discount, then sales taxEveryday | Passed: Final answer 66: right. | $0.0002 | 0.6 s |
| Pens at 3 for $4Everyday | Passed: Final answer Buy three 3-packs (9 pens) plus one single pen for 13.50.: right. | $0.0003 | 25.6 s |
| Compound interest over three yearsEveryday | Passed: Final answer 315.25: right. | $0.0002 | 1.5 s |
| Four-digit numbers whose digits sum to 9Hard | Passed: Final answer 165: right. | $0.0002 | 1.7 s |
| The highest of three dice is a 5Hard | Passed: Final answer 61/216: right. | $0.0002 | 2.5 s |
Every math reply from DeepSeek V4.1 Flash
A discount, then sales tax
An everyday prompt: “A discount, then sales tax”, in full.
Passed: Final answer 66: right.
$80 × 0.75 = $60 (after 25% discount) $60 × 1.10 = $66 (with 10% tax) Final answer: $66
440 tokens in, 64 out (23 of them reasoning) · 0.6 s · $0.0002 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Parasail ·
Pens at 3 for $4
An everyday prompt: “Pens at 3 for $4”, in full.
Passed: Final answer Buy three 3-packs (9 pens) plus one single pen for 13.50.: right.
**Working:** - 3-pack price per pen: $4 ÷ 3 ≈ $1.33 (best value) - Buy as many 3-packs as fit: 3 packs = 9 pens = $12, plus 1 single at $1.50 = **$13.50** - Check other combinations: 2 packs + 4 singles = $8 + $6 = $14; 1 pack + 7 singles = $14.50; 10 singles = $15 - The $13.50 option is cheapest. Final answer: Buy three 3-packs (9 pens) plus one single pen for $13.50.
442 tokens in, 854 out (716 of them reasoning) · 25.6 s · $0.0003 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Morph ·
Compound interest over three years
An everyday prompt: “Compound interest over three years”, in full.
Passed: Final answer 315.25: right.
**Working:** - Year 1: $2,000 × 1.05 = $2,100.00 - Year 2: $2,100.00 × 1.05 = $2,205.00 - Year 3: $2,205.00 × 1.05 = $2,315.25 Interest earned = $2,315.25 − $2,000.00 = **$315.25** Final answer: $315.25
440 tokens in, 186 out (82 of them reasoning) · 1.5 s · $0.0002 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via CoreWeave ·
Four-digit numbers whose digits sum to 9
A hard prompt: “Four-digit numbers whose digits sum to 9”, in full.
Passed: Final answer 165: right.
Let the digits be $a,b,c,d$ with $a \ge 1$ (four-digit) and $b,c,d \ge 0$, and $a+b+c+d=9$. Set $a' = a-1 \ge 0$. Then $a'+b+c+d = 8$. Number of nonnegative solutions to a sum of 8 across 4 variables: $$\binom{8+4-1}{4-1} = \binom{11}{3} = 165$$ Final answer: 165417 tokens in, 216 out (104 of them reasoning) · 1.7 s · $0.0002 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Novita ·
The highest of three dice is a 5
A hard prompt: “The highest of three dice is a 5”, in full.
Passed: Final answer 61/216: right.
Total outcomes: 6³ = 216. Max exactly 5 means all dice show ≤ 5, but not all show ≤ 4: - All ≤ 5: 5³ = 125 - All ≤ 4: 4³ = 64 So favorable outcomes: 125 − 64 = 61. Probability = 61/216 (already in lowest terms, since 61 is prime and doesn't divide 216). Final answer: 61/216
432 tokens in, 155 out (55 of them reasoning) · 2.5 s · $0.0002 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via CoreWeave ·
How it compares on math
DeepSeek V4.1 Flash beside the job's picks among every model. 14 models share the hard-problems pick, DeepSeek V4.1 Flash among them.
| Model | Passed | On Pro | Cost per reply |
|---|---|---|---|
| GLM 5.3Our pick: hard problems (shared), best value | 5 of 5 | 250 a month on Pro | $0.0004 |
| GLM 5.3 FlashOur pick: hard problems (shared), everyday | 5 of 5 | 60 a day on Pro | $0.0002 |
| DeepSeek V4.1 FlashOur pick: hard problems (shared) | 5 of 5 | 60 a day on Pro | $0.0002 |
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
How these runs were done
Final answer. Automatic. The reply's last “Final answer:” line must hold the right value.
DeepSeek V4.1 Flash, and math, elsewhere
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- Analyze a CSV with code: the prompt, and its price
- Our test runs: 50 prompts on every model
Questions
Is DeepSeek V4.1 Flash good for math?
In our test runs it passed 5 of 5 math prompts, tied 1st of the 15 models in llmwise. Every reply is on this page, so you can judge them yourself.
How many of my messages does a math reply from DeepSeek V4.1 Flash use?
1 message each on Pro, where it has 60 a day on Pro. The price of a message is fixed and shown before you send it, however long the reply.
How were these runs done?
The same way for every model: each prompt sent through llmwise's own pipeline, each reply checked the same way. The methods page has every prompt and how each is scored.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
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