Comparison · Math
Claude vs DeepSeek for math
On llmwise Pro, Claude Sonnet 5.5 gets up to 125 messages a month and DeepSeek V4 Pro up to 250 messages a month. We ran the same 5 math prompts on all 6 Claude models and all 2 DeepSeek models and published every reply: the results, then Claude Haiku 5.5 against DeepSeek V4.1 Flash prompt by prompt, then how Claude and DeepSeek compare on price per message, context and files.
Based on 40 of our test runs on , through OpenRouter with the app's own prompt and settings. Updated .
Short answer
In our math test runs on October 8, 2026, Claude's 6 models passed 30 of 30; Claude Fable 5.1, Claude Opus 5.5 and 4 more each passed 5 of 5. DeepSeek's 2 models passed 10 of 10; DeepSeek V4 Pro and DeepSeek V4.1 Flash each passed 5 of 5. Claude Haiku 5.5 and DeepSeek V4.1 Flash each passed 5 of the 5 prompts, so these math prompts don't split Claude and DeepSeek; the replies on this page show how they differ.
Claude and DeepSeek on our math test runs
Every Claude and DeepSeek model in llmwise on our 5 math prompts: how many replies passed, what each counted as on Pro, and what it cost to run.
| Model | Passed | Hard ones | Messages used on Pro | Cost per reply | Time per reply |
|---|---|---|---|---|---|
| Claude Fable 5.1Anthropic | 5 of 5 | 2 of 2 | 1 each, of 31 a month on Pro | $0.0116 | 4.6 s |
| Claude Opus 5.5Anthropic | 5 of 5 | 2 of 2 | 1 each, of 62 a month on Pro | $0.0060 | 4.1 s |
| Claude Sonnet 5.5Anthropic | 5 of 5 | 2 of 2 | 1 each, of 125 a month on Pro | $0.0025 | 1.7 s |
| Claude Sonnet 5Anthropic | 5 of 5 | 2 of 2 | 1 each, of 125 a month on Pro | $0.0033 | 4.1 s |
| Claude Haiku 4.5Anthropic | 5 of 5 | 2 of 2 | 1 each, of 250 a month on Pro | $0.0015 | 2.4 s |
| Claude Haiku 5.5Anthropic | 5 of 5 | 2 of 2 | 1 each, of 60 a day on Pro | $0.0001 | 1.7 s |
| DeepSeek V4 ProDeepSeek | 5 of 5 | 2 of 2 | 1 each, of 250 a month on Pro | $0.0009 | 2.9 s |
| DeepSeek V4.1 FlashDeepSeek | 5 of 5 | 2 of 2 | 1 each, of 60 a day on Pro | $0.0002 | 1.1 s |
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.
Claude vs DeepSeek, prompt by prompt
Each math prompt with Claude Haiku 5.5 and DeepSeek V4.1 Flash side by side, as they replied: for each side, the model that passed the most math prompts (then the most hard ones, then the cheaper).
Math: Claude Haiku 5.5 passed 5 of 5 and DeepSeek V4.1 Flash 5 of 5. DeepSeek V4.1 Flash answered 1.9× sooner at the median, 1.7 s against 0.9 s. Claude Haiku 5.5 cost 1.7× less, $0.0007 against $0.0012 for the 5 replies. Claude Haiku 5.5's replies ran 93% longer, in tokens of reply, thinking not counted.
1. A discount, then sales tax
Everyday. Claude: 6 of 6 models passed, Claude Haiku 5.5 the cheapest at $0.0001 · DeepSeek: 2 of 2 models passed, DeepSeek V4.1 Flash the cheapest at $0.0001. The prompt in full.
Claude Haiku 5.5 and DeepSeek V4.1 Flash both passed this one. DeepSeek V4.1 Flash answered sooner (0.7 s to 1.3 s), and Claude Haiku 5.5's reply cost less ($0.0001 to $0.0001); Claude Haiku 5.5 wrote 61 tokens of reply, DeepSeek V4.1 Flash 41.
Claude Haiku 5.5
Passed: Final answer 66: right.
Discounted price: $80 × 0.75 = $60 Sales tax: $60 × 0.10 = $6 Total: $60 + $6 = $66 Final answer: $66
544 tokens in, 61 out · 1.3 s · $0.0001 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
DeepSeek V4.1 Flash
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
Everyday. Claude: 6 of 6 models passed, Claude Haiku 5.5 the cheapest at $0.0002 · DeepSeek: 2 of 2 models passed, DeepSeek V4.1 Flash the cheapest at $0.0004. The prompt in full.
Claude Haiku 5.5 and DeepSeek V4.1 Flash both passed this one. DeepSeek V4.1 Flash answered sooner (0.9 s to 1.7 s), and Claude Haiku 5.5's reply cost less ($0.0002 to $0.0004); Claude Haiku 5.5 wrote 212 tokens of reply, DeepSeek V4.1 Flash 146.
Claude Haiku 5.5
Passed: Final answer Buy 3 packs of 3 and 1 single pen, costing 13.50: right.
Options per pen: - Bundle of 3 costs $4 (about $1.33 per pen). - Single pen costs $1.50. For 10 pens, use as many bundles as possible: - 3 bundles = 9 pens = $12.00 - 1 single pen = $1.50 - Total = $13.50 Check alternatives: - 2 bundles + 4 singles = $8 + $6 = $14.00 - 0 bundles + 10 singles = $15.00 - 3 bundles + 1 single is the cheapest. Final answer: Buy 3 packs of 3 and 1 single pen, costing $13.50
548 tokens in, 212 out · 1.7 s · $0.0002 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
DeepSeek V4.1 Flash
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
Everyday. Claude: 6 of 6 models passed, Claude Haiku 5.5 the cheapest at $0.0001 · DeepSeek: 2 of 2 models passed, DeepSeek V4.1 Flash the cheapest at $0.0002. The prompt in full.
Claude Haiku 5.5 and DeepSeek V4.1 Flash both passed this one. Claude Haiku 5.5 answered sooner (1.3 s to 2.1 s), and Claude Haiku 5.5's reply cost less ($0.0001 to $0.0002); Claude Haiku 5.5 wrote 104 tokens of reply, DeepSeek V4.1 Flash 72.
Claude Haiku 5.5
Passed: Final answer 315.25: right.
Compound interest formula: A = P(1 + r)^t A = 2000 × (1.05)^3 (1.05)^3 = 1.157625 A = 2000 × 1.157625 = 2315.25 Interest earned = 2315.25 − 2000 = 315.25 Final answer: $315.25
542 tokens in, 104 out · 1.3 s · $0.0001 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
DeepSeek V4.1 Flash
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
Hard. Claude: 6 of 6 models passed, Claude Haiku 5.5 the cheapest at $0.0002 · DeepSeek: 2 of 2 models passed, DeepSeek V4.1 Flash the cheapest at $0.0003. The prompt in full.
Claude Haiku 5.5 and DeepSeek V4.1 Flash both passed this one. DeepSeek V4.1 Flash answered sooner (0.7 s to 1.9 s), and Claude Haiku 5.5's reply cost less ($0.0002 to $0.0003); Claude Haiku 5.5 wrote 305 tokens of reply, DeepSeek V4.1 Flash 105.
Claude Haiku 5.5
Passed: Final answer 165: right.
We need four-digit numbers d1 d2 d3 d4 with d1 from 1 to 9, d2, d3, d4 from 0 to 9, and digit sum 9. Substitute e1 = d1 − 1, so e1 ranges 0 to 8, and e1 + d2 + d3 + d4 = 8 with all variables from 0 to 9. Since the sum is 8, no variable can exceed 8, so the upper bound of 9 is never violated. The number of nonnegative solutions is C(8+3, 3) = C(11, 3) = 165. Check: total solutions with d1 ≥ 0 allowed (i.e., first digit could be 0) for sum 9 across four digits is C(12, 3) = 220. Those with d1 = 0 correspond to three digits summing to 9: C(11, 2) = 55. So 220 − 55 = 165, which matches. Final answer: 165
513 tokens in, 305 out · 1.9 s · $0.0002 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
DeepSeek V4.1 Flash
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
Hard. Claude: 6 of 6 models passed, Claude Haiku 5.5 the cheapest at $0.0002 · DeepSeek: 2 of 2 models passed, DeepSeek V4.1 Flash the cheapest at $0.0002. The prompt in full.
Claude Haiku 5.5 and DeepSeek V4.1 Flash both passed this one. DeepSeek V4.1 Flash answered sooner (1.0 s to 2.1 s), and Claude Haiku 5.5's reply cost less ($0.0002 to $0.0002); Claude Haiku 5.5 wrote 179 tokens of reply, DeepSeek V4.1 Flash 81.
Claude Haiku 5.5
Passed: Final answer 61/216: right.
The highest number is exactly 5 when all three dice show at most 5, minus the cases where all three show at most 4: - All dice ≤ 5: 5³ = 125 outcomes - All dice ≤ 4: 4³ = 64 outcomes - Exactly max 5: 125 − 64 = 61 outcomes Out of 6³ = 216 total outcomes, the probability is 61/216. Since 61 is prime and doesn't divide 216, the fraction is already in lowest terms. Final answer: 61/216
540 tokens in, 250 out (71 of them reasoning) · 2.1 s · $0.0002 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
DeepSeek V4.1 Flash
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 ·
Each Claude model against each DeepSeek model
Every Claude model against every DeepSeek model on the same 5 math prompts: passes, the median wait and what the replies cost. A lead under 10% counts as close.
Claude Fable 5.1 vs DeepSeek V4 Pro: 5 of 5 each; DeepSeek V4 Pro answered 1.7× sooner at the median and cost 13.3× less.
Claude Fable 5.1 vs DeepSeek V4.1 Flash: 5 of 5 each; DeepSeek V4.1 Flash answered 5.0× sooner at the median and cost 46.5× less.
Claude Opus 5.5 vs DeepSeek V4 Pro: 5 of 5 each; DeepSeek V4 Pro answered 1.4× sooner at the median and cost 6.8× less. Claude Opus 5.5 vs DeepSeek V4 Pro, on every job.
Claude Opus 5.5 vs DeepSeek V4.1 Flash: 5 of 5 each; DeepSeek V4.1 Flash answered 4.2× sooner at the median and cost 23.8× less.
Claude Sonnet 5.5 vs DeepSeek V4 Pro: 5 of 5 each; Claude Sonnet 5.5 answered 1.6× sooner at the median and DeepSeek V4 Pro cost 2.8× less.
Claude Sonnet 5.5 vs DeepSeek V4.1 Flash: 5 of 5 each; DeepSeek V4.1 Flash answered 1.8× sooner at the median and cost 9.9× less.
Claude Sonnet 5 vs DeepSeek V4 Pro: 5 of 5 each; DeepSeek V4 Pro answered 1.5× sooner at the median and cost 3.8× less. Claude Sonnet 5 vs DeepSeek V4 Pro, on every job.
Claude Sonnet 5 vs DeepSeek V4.1 Flash: 5 of 5 each; DeepSeek V4.1 Flash answered 4.2× sooner at the median and cost 13.2× less.
Claude Haiku 4.5 vs DeepSeek V4 Pro: 5 of 5 each; Claude Haiku 4.5 answered 1.2× sooner at the median and DeepSeek V4 Pro cost 1.8× less. Claude Haiku 4.5 vs DeepSeek V4 Pro, on every job.
Claude Haiku 4.5 vs DeepSeek V4.1 Flash: 5 of 5 each; DeepSeek V4.1 Flash answered 2.4× sooner at the median and cost 6.2× less. Claude Haiku 4.5 vs DeepSeek V4.1 Flash, on every job.
Claude Haiku 5.5 vs DeepSeek V4 Pro: 5 of 5 each; Claude Haiku 5.5 answered 1.6× sooner at the median and cost 6.0× less.
Claude Haiku 5.5 vs DeepSeek V4.1 Flash: 5 of 5 each; DeepSeek V4.1 Flash answered 1.9× sooner at the median and Claude Haiku 5.5 cost 1.7× less. Claude Haiku 5.5 vs DeepSeek V4.1 Flash, on every job.
How the math replies are scored
Every Claude and DeepSeek reply above was checked the same way as every other model's, by the rules published with the prompts: how the math prompts are scored, and each one in full.
The differences at a glance
What follows from each model's facts in our catalog.
The lineups
Claude: 6 models, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Haiku 4.5, and Claude Haiku 5.5. DeepSeek: 2 models, DeepSeek V4 Pro and DeepSeek V4.1 Flash.
Price per message
The least expensive Claude model is Claude Haiku 5.5 (60 messages a day on Pro); the least expensive DeepSeek model is DeepSeek V4.1 Flash (60 messages a day on Pro).
Context window
Claude goes up to 1M tokens (Claude Fable 5.1); DeepSeek up to 1.05M tokens (DeepSeek V4 Pro).
Images and PDFs
DeepSeek V4 Pro doesn't read images. DeepSeek V4 Pro and DeepSeek V4.1 Flash get a PDF's text rather than the file itself.
On the Free plan
Free's one-time trial of 5 messages covers Claude Haiku 5.5. Paid plans have them, with messages every month: Claude Fable 5.1 from Pro up.
Every Claude and DeepSeek model's context window, files and API price: DeepSeek vs Claude.
Where your messages go
In llmwise, a message to Claude goes to its maker, Anthropic, or through OpenRouter when llmwise can't reach the maker directly. DeepSeek models are served only through OpenRouter, by endpoints that don't store or train on prompts. The Privacy Policy has the details.
Questions
Which is better, Claude or DeepSeek for math?
In our math test runs on October 8, 2026, Claude's 6 models passed 30 of 30; Claude Fable 5.1, Claude Opus 5.5 and 4 more each passed 5 of 5. DeepSeek's 2 models passed 10 of 10; DeepSeek V4 Pro and DeepSeek V4.1 Flash each passed 5 of 5. Claude Haiku 5.5 and DeepSeek V4.1 Flash each passed 5 of the 5 prompts, so these math prompts don't split Claude and DeepSeek; the replies on this page show how they differ.
Is Claude or DeepSeek cheaper?
In llmwise, the least expensive Claude model is Claude Haiku 5.5 (60 messages a day on Pro), and the least expensive DeepSeek model is DeepSeek V4.1 Flash (60 messages a day on Pro). At API list prices (October 2026), a typical message of 4,000 tokens in and 700 out costs $0.0008 on Claude Haiku 5.5 and $0.0020 on DeepSeek V4.1 Flash.
Can I use Claude and DeepSeek in the same chat?
Yes. Ask Claude Haiku 5.5 a question, then switch the picker to DeepSeek V4.1 Flash and ask again: DeepSeek V4.1 Flash sees the whole conversation, Claude Haiku 5.5's answer included.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, GLM, and Mistral, in one chat.
See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.