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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.

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Based on 5 of our test runs on , through OpenRouter with the app's own prompt and settings. Updated .

Short answer

In our test runs on October 8, 2026, DeepSeek V4.1 Flash passed 5 of 5 of our math prompts (both hard ones): tied 1st of 20 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.

DeepSeek V4.1 Flash on each math prompt
PromptResultCostTime
A discount, then sales taxEverydayPassed: Final answer 66: right.$0.00010.7 s
Pens at 3 for $4EverydayPassed: Final answer Buy 3 packs of 3 (9 pens) plus 1 single pen, for 13.50.: right.$0.00040.9 s
Compound interest over three yearsEverydayPassed: Final answer 315.25: right.$0.00022.1 s
Four-digit numbers whose digits sum to 9HardPassed: Final answer 165: right.$0.00030.7 s
The highest of three dice is a 5HardPassed: Final answer 61/216: right.$0.00021.0 s

Every math reply from DeepSeek V4.1 Flash

  1. 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 (after 10% tax)

Final answer: $66

    440 tokens in, 63 out (22 of them reasoning) · 0.7 s · $0.0001 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together ·

  2. Pens at 3 for $4

    An everyday prompt: “Pens at 3 for $4”, in full.

    Passed: Final answer Buy 3 packs of 3 (9 pens) plus 1 single pen, for 13.50.: right.

    3-pack rate: $4/3 ≈ $1.33 per pen, cheaper than $1.50 singles.

Options:
- 3 packs (9 pens) + 1 single = $12 + $1.50 = $13.50
- 2 packs (6) + 4 singles = $8 + $6 = $14.00
- 1 pack + 7 singles = $4 + $10.50 = $14.50
- 10 singles = $15.00

Best is 3 packs plus 1 single pen.

Final answer: Buy 3 packs of 3 (9 pens) plus 1 single pen, for $13.50.

    442 tokens in, 291 out (145 of them reasoning) · 0.9 s · $0.0004 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together ·

  3. Compound interest over three years

    An everyday prompt: “Compound interest over three years”, in full.

    Passed: Final answer 315.25: right.

    A = P(1 + r)^n = 2000(1.05)^3

1.05³ = 1.157625
2000 × 1.157625 = 2315.25
Interest = 2315.25 − 2000 = 315.25

Final answer: $315.25

    441 tokens in, 111 out (39 of them reasoning) · 2.1 s · $0.0002 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together ·

  4. 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 ≥ 1 (it's a four-digit number) and b, c, d ≥ 0, and a+b+c+d = 9.

Substitute a = a' + 1 where a' ≥ 0:
a' + b + c + d = 8

Number of non-negative solutions = C(8+3, 3) = C(11, 3) = 165.

Final answer: 165

    417 tokens in, 197 out (92 of them reasoning) · 0.7 s · $0.0003 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together ·

  5. 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.

    Count outcomes where all three dice are ≤ 5, then subtract those where all are ≤ 4 (so no 5 appears):

- All ≤ 5: 5³ = 125
- All ≤ 4: 4³ = 64

Favorable outcomes: 125 − 64 = 61, out of 216 total.

Final answer: 61/216

    433 tokens in, 150 out (69 of them reasoning) · 1.0 s · $0.0002 · 1 message on Pro · answered by deepseek/deepseek-v4.1-flash via Together ·

How it compares on math

DeepSeek V4.1 Flash beside the job's picks among every model. 19 models share the hard-problems pick, DeepSeek V4.1 Flash among them.

DeepSeek V4.1 Flash beside other models on math
ModelPassedOn ProCost per reply
GLM 5.3Our pick: hard problems (shared), best value5 of 5250 a month on Pro$0.0004
Claude Haiku 5.5Our pick: hard problems (shared), everyday5 of 560 a day on Pro$0.0001
DeepSeek V4.1 FlashOur pick: hard problems (shared)5 of 560 a day on Pro$0.0002
On Pro: Pro's count on each model. Cost: what OpenRouter charged us per reply, on average.

Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Plus $3.75, 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.

DeepSeek V4.1 Flash next to each model on math

DeepSeek V4.1 Flash against each model on the same 5 math prompts. One run each, through OpenRouter: a wait depends on the provider and the load that day, so a lead under 10% counts as close.

  • Against Claude Fable 5.1: DeepSeek V4.1 Flash answered 5.0× sooner (0.9 s to 4.6 s), cost 46.5× less, and passed 5 of 5 to its 5.

  • Against Claude Opus 5.5: DeepSeek V4.1 Flash answered 4.2× sooner (0.9 s to 3.9 s), cost 23.8× less, and passed 5 of 5 to its 5.

  • Against Claude Sonnet 5.5: DeepSeek V4.1 Flash answered 1.8× sooner (0.9 s to 1.7 s), cost 9.9× less, and passed 5 of 5 to its 5.

  • Against Claude Sonnet 5: DeepSeek V4.1 Flash answered 4.2× sooner (0.9 s to 3.9 s), cost 13.2× less, and passed 5 of 5 to its 5.

  • Against Claude Haiku 5.5: DeepSeek V4.1 Flash answered 1.9× sooner (0.9 s to 1.7 s), cost 1.7× more, and passed 5 of 5 to its 5.

  • Against Claude Haiku 4.5: DeepSeek V4.1 Flash answered 2.4× sooner (0.9 s to 2.2 s), cost 6.2× less, and passed 5 of 5 to its 5.

  • Against GPT-6 Astra: DeepSeek V4.1 Flash answered 2.8× sooner (0.9 s to 2.6 s), cost 34.2× less, and passed 5 of 5 to its 5.

  • Against GPT-6.1 Sol: DeepSeek V4.1 Flash answered 1.9× sooner (0.9 s to 1.8 s), cost 3.4× less, and passed 5 of 5 to its 5.

  • Against GPT-6 Sol: DeepSeek V4.1 Flash answered 2.3× sooner (0.9 s to 2.2 s), cost 7.2× less, and passed 5 of 5 to its 5.

  • Against GPT-6 Luna: DeepSeek V4.1 Flash answered 2.4× sooner (0.9 s to 2.2 s), cost 2.5× more, and passed 5 of 5 to its 4. Only DeepSeek V4.1 Flash passed Pens at 3 for $4.

  • Against Gemini 4 Argon: DeepSeek V4.1 Flash answered 4.7× sooner (0.9 s to 4.4 s), cost 6.2× less, and passed 5 of 5 to its 5.

  • Against Gemini 3.1 Pro (preview): DeepSeek V4.1 Flash answered 8.9× sooner (0.9 s to 8.3 s), cost 40.0× less, and passed 5 of 5 to its 5.

  • Against Gemini 3.8 Flash: DeepSeek V4.1 Flash answered 5.0× sooner (0.9 s to 4.7 s), cost 5.7× less, and passed 5 of 5 to its 5.

  • Against DeepSeek V4 Pro: DeepSeek V4.1 Flash answered 2.9× sooner (0.9 s to 2.7 s), cost 3.5× less, and passed 5 of 5 to its 5.

  • Against Grok 4.7: DeepSeek V4.1 Flash answered 12.6× sooner (0.9 s to 11.7 s), cost 28.9× less, and passed 5 of 5 to its 5.

  • Against Kimi K3: DeepSeek V4.1 Flash answered 5.8× sooner (0.9 s to 5.4 s), cost 15.0× less, and passed 5 of 5 to its 5.

  • Against GLM 5.3: DeepSeek V4.1 Flash answered within 10% of its time (0.9 s to 0.9 s), cost 1.4× less, and passed 5 of 5 to its 5.

  • Against GLM 5.3 Flash: DeepSeek V4.1 Flash answered 2.9× sooner (0.9 s to 2.7 s), cost 1.7× more, and passed 5 of 5 to its 5.

  • Against Mistral Large 4: DeepSeek V4.1 Flash answered 5.5× sooner (0.9 s to 5.1 s), cost 7.3× less, and passed 5 of 5 to its 5.

How these runs were done

Final answer. Automatic. The reply's last “Final answer:” line must hold the right value.

How the runs were done, and every math prompt.

DeepSeek V4.1 Flash, and math, elsewhere

Questions

Is DeepSeek V4.1 Flash good for math?

In our test runs it passed 5 of 5 math prompts, tied 1st of the 20 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, GLM, and Mistral, in one chat.

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