Model vs model
Gemini 3.8 Flash vs DeepSeek V4 Pro
Gemini 3.8 Flash and DeepSeek V4 Pro are both in llmwise. What each gets on every plan, what it reads, how it's served and what happens when its provider fails, from the catalog and the code that runs them.
Model prices and specs checked against OpenRouter's Gemini 3.8 Flash page, OpenRouter's DeepSeek V4 Pro page. Updated .
Short answer
They cost the same in llmwise: up to 250 messages a month on Pro on either. Otherwise, only Gemini 3.8 Flash reads images and only Gemini 3.8 Flash reads a PDF as the whole file. In our test runs, Gemini 3.8 Flash passed 46 of the 50 prompts both answered and DeepSeek V4 Pro 49; 3 prompts split them, most on writing (3 to 5).
Gemini 3.8 Flash vs DeepSeek V4 Pro, prompt by prompt
Every prompt Gemini 3.8 Flash and DeepSeek V4 Pro both answered, compared directly, their biggest differences first. One run each, through OpenRouter: a wait depends on the provider and the load that day, so a lead under 10% counts as close.
Of the 50 prompts both answered, both passed 46, only Gemini 3.8 Flash passed 0, only DeepSeek V4 Pro passed 3, and neither passed 1. Gemini 3.8 Flash answered sooner on 17 of the 50 and DeepSeek V4 Pro on 28; the rest were within 10% of each other. The 50 replies cost $0.0644 on Gemini 3.8 Flash and $0.1827 on DeepSeek V4 Pro: 2.8× less on Gemini 3.8 Flash.
The 3 prompts only one of Gemini 3.8 Flash and DeepSeek V4 Pro passed
Rewrite corporate jargon in plain words (writing): DeepSeek V4 Pro passed and Gemini 3.8 Flash didn't. Gemini 3.8 Flash: Graded 3.7 of 5 on average (lowest 3). DeepSeek V4 Pro: Graded 4.3 of 5 on average (lowest 4).
A product announcement with five rules (writing): DeepSeek V4 Pro passed and Gemini 3.8 Flash didn't. Gemini 3.8 Flash: Graded 3.7 of 5 on average (lowest 3). DeepSeek V4 Pro: Graded 4.3 of 5 on average (lowest 4).
Correlation between ad spend and sign-ups (data analysis): DeepSeek V4 Pro passed and Gemini 3.8 Flash didn't. Gemini 3.8 Flash: Final answer 0.91; expected 0.97. DeepSeek V4 Pro: Final answer 0.97: right.
Job by job, the widest gaps first
Writing: Gemini 3.8 Flash passed 3 of 5 and DeepSeek V4 Pro 5 of 5. Their median waits were close, 3.9 s against 3.9 s. DeepSeek V4 Pro cost 1.2× less, $0.0066 against $0.0054 for the 5 replies. Gemini 3.8 Flash's replies ran 30% longer, in tokens of reply, thinking not counted.
Data analysis: Gemini 3.8 Flash passed 4 of 5 and DeepSeek V4 Pro 5 of 5. DeepSeek V4 Pro answered 1.3× sooner at the median, 5.4 s against 4.1 s. They cost about the same, $0.0138 against $0.0143 for the 5 replies. Gemini 3.8 Flash's replies ran 252% longer, in tokens of reply, thinking not counted.
Coding: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. Gemini 3.8 Flash answered 28.6× sooner at the median, 4.2 s against 119.6 s. Gemini 3.8 Flash cost 12.3× less, $0.0098 against $0.1200 for the 5 replies. Gemini 3.8 Flash's replies ran 53% longer, in tokens of reply, thinking not counted.
SQL: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. Gemini 3.8 Flash answered 2.2× sooner at the median, 3.7 s against 8.0 s. Gemini 3.8 Flash cost 2.7× less, $0.0037 against $0.0101 for the 5 replies. Gemini 3.8 Flash's replies ran 14% longer, in tokens of reply, thinking not counted.
Translation: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. Gemini 3.8 Flash answered 1.4× sooner at the median, 3.0 s against 4.3 s. Gemini 3.8 Flash cost 2.7× less, $0.0037 against $0.0100 for the 5 replies. Their replies ran to about the same length.
Math: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. DeepSeek V4 Pro answered 1.7× sooner at the median, 4.7 s against 2.7 s. DeepSeek V4 Pro cost 1.6× less, $0.0071 against $0.0044 for the 5 replies. Gemini 3.8 Flash's replies ran 97% longer, in tokens of reply, thinking not counted.
Agents and tool use: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. DeepSeek V4 Pro answered 2.7× sooner at the median, 4.4 s against 1.6 s. DeepSeek V4 Pro cost 1.3× less, $0.0043 against $0.0033 for the 5 replies. Their replies ran to about the same length.
Summarization: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. DeepSeek V4 Pro answered 1.8× sooner at the median, 3.7 s against 2.1 s. Gemini 3.8 Flash cost 1.2× less, $0.0038 against $0.0046 for the 5 replies. Gemini 3.8 Flash's replies ran 11% longer, in tokens of reply, thinking not counted.
RAG and answering from documents: Gemini 3.8 Flash passed 5 of 5 and DeepSeek V4 Pro 5 of 5. DeepSeek V4 Pro answered 1.5× sooner at the median, 3.1 s against 2.1 s. They cost about the same, $0.0033 against $0.0030 for the 5 replies. Gemini 3.8 Flash's replies ran 44% longer, in tokens of reply, thinking not counted.
Customer support: Gemini 3.8 Flash passed 4 of 5 and DeepSeek V4 Pro 4 of 5. Gemini 3.8 Flash answered 1.1× sooner at the median, 3.7 s against 4.1 s. They cost about the same, $0.0082 against $0.0077 for the 5 replies. Gemini 3.8 Flash's replies ran 25% longer, in tokens of reply, thinking not counted.
All 50 prompts: who passed, who answered sooner, who cost less
| Prompt | Result | Sooner | Cheaper |
|---|---|---|---|
| Turn a title into a URL slug | Both passed | Closetook 4.2 s and 3.9 s | Gemini 3.8 Flash, 1.7×cost $0.0009 and $0.0015 |
| Parse a duration like “1h 30m” | Both passed | Gemini 3.8 Flash, 52.0×took 2.3 s and 119.6 s | Gemini 3.8 Flash, 35.5×cost $0.0010 and $0.0366 |
| Merge overlapping intervals | Both passed | Gemini 3.8 Flash, 1.8×took 3.8 s and 6.8 s | Gemini 3.8 Flash, 1.7×cost $0.0012 and $0.0021 |
| Evaluate an arithmetic expression, no eval | Both passed | Gemini 3.8 Flash, 21.6×took 6.7 s and 145.7 s | Gemini 3.8 Flash, 9.9×cost $0.0045 and $0.0440 |
| Parse CSV with quoted fields | Both passed | Gemini 3.8 Flash, 24.6×took 5.0 s and 122.3 s | Gemini 3.8 Flash, 16.3×cost $0.0022 and $0.0357 |
| Announce a second bakery shop on LinkedIn | Both passed | Closetook 3.9 s and 3.9 s | Closecost $0.0009 and $0.0010 |
| Rewrite corporate jargon in plain words | Only DeepSeek V4 Pro | Gemini 3.8 Flash, 1.8×took 3.1 s and 5.8 s | Gemini 3.8 Flash, 3.8×cost $0.0006 and $0.0024 |
| Decline a meeting and offer two times | Both passed | Closetook 3.5 s and 3.3 s | DeepSeek V4 Pro, 1.3×cost $0.0008 and $0.0006 |
| A product announcement with five rules | Only DeepSeek V4 Pro | DeepSeek V4 Pro, 4.2×took 7.6 s and 1.8 s | DeepSeek V4 Pro, 6.3×cost $0.0031 and $0.0005 |
| Argue both sides of free buses | Both passed | DeepSeek V4 Pro, 1.3×took 5.2 s and 4.1 s | DeepSeek V4 Pro, 1.3×cost $0.0011 and $0.0009 |
| A discount, then sales tax | Both passed | DeepSeek V4 Pro, 1.4×took 2.5 s and 1.8 s | DeepSeek V4 Pro, 1.3×cost $0.0007 and $0.0005 |
| Pens at 3 for $4 | Both passed | DeepSeek V4 Pro, 1.7×took 4.7 s and 2.7 s | DeepSeek V4 Pro, 1.6×cost $0.0017 and $0.0010 |
| Compound interest over three years | Both passed | Gemini 3.8 Flash, 1.6×took 2.1 s and 3.4 s | DeepSeek V4 Pro, 1.2×cost $0.0009 and $0.0008 |
| Four-digit numbers whose digits sum to 9 | Both passed | DeepSeek V4 Pro, 1.2×took 4.7 s and 4.0 s | DeepSeek V4 Pro, 1.8×cost $0.0022 and $0.0012 |
| The highest of three dice is a 5 | Both passed | DeepSeek V4 Pro, 1.9×took 4.9 s and 2.5 s | DeepSeek V4 Pro, 2.0×cost $0.0018 and $0.0009 |
| An article in three bullets | Both passed | DeepSeek V4 Pro, 2.1×took 3.7 s and 1.8 s | Gemini 3.8 Flash, 1.4×cost $0.0007 and $0.0010 |
| An email thread in one sentence | Both passed | DeepSeek V4 Pro, 3.1×took 3.8 s and 1.2 s | Closecost $0.0005 and $0.0005 |
| Decisions and action items from a meeting | Both passed | Gemini 3.8 Flash, 1.7×took 3.2 s and 5.4 s | Gemini 3.8 Flash, 1.2×cost $0.0009 and $0.0011 |
| A quarterly memo for the CEO | Both passed | DeepSeek V4 Pro, 1.8×took 4.0 s and 2.3 s | Gemini 3.8 Flash, 1.5×cost $0.0009 and $0.0014 |
| A study with a negative result | Both passed | DeepSeek V4 Pro, 1.7×took 3.6 s and 2.1 s | DeepSeek V4 Pro, 1.2×cost $0.0007 and $0.0005 |
| The region with the most revenue | Both passed | DeepSeek V4 Pro, 1.8×took 7.4 s and 4.1 s | DeepSeek V4 Pro, 1.9×cost $0.0038 and $0.0020 |
| Average order value in August | Both passed | DeepSeek V4 Pro, 2.0×took 4.4 s and 2.2 s | DeepSeek V4 Pro, 1.3×cost $0.0016 and $0.0012 |
| Revenue change from July to August | Both passed | DeepSeek V4 Pro, 1.3×took 6.6 s and 5.2 s | DeepSeek V4 Pro, 1.8×cost $0.0037 and $0.0020 |
| A median, filtered two ways | Both passed | DeepSeek V4 Pro, 3.0×took 3.5 s and 1.2 s | Closecost $0.0010 and $0.0011 |
| Correlation between ad spend and sign-ups | Only DeepSeek V4 Pro | Gemini 3.8 Flash, 1.5×took 5.4 s and 8.1 s | Gemini 3.8 Flash, 2.2×cost $0.0037 and $0.0081 |
| A late order | Both passed | Gemini 3.8 Flash, 1.3×took 3.1 s and 4.1 s | Gemini 3.8 Flash, 2.5×cost $0.0009 and $0.0023 |
| A return inside the window | Both passed | DeepSeek V4 Pro, 2.2×took 2.9 s and 1.3 s | DeepSeek V4 Pro, 1.3×cost $0.0009 and $0.0007 |
| A frustrated customer | Neither passed | Gemini 3.8 Flash, 2.6×took 3.7 s and 9.5 s | Gemini 3.8 Flash, 1.7×cost $0.0011 and $0.0018 |
| A refund request outside the window | Both passed | DeepSeek V4 Pro, 2.3×took 5.9 s and 2.5 s | DeepSeek V4 Pro, 2.4×cost $0.0029 and $0.0012 |
| A message with a planted instruction | Both passed | Closetook 7.3 s and 6.7 s | DeepSeek V4 Pro, 1.4×cost $0.0025 and $0.0017 |
| A delivery message into Spanish | Both passed | Gemini 3.8 Flash, 2.4×took 3.7 s and 8.8 s | Gemini 3.8 Flash, 5.6×cost $0.0008 and $0.0044 |
| A product description into French | Both passed | DeepSeek V4 Pro, 1.6×took 2.2 s and 1.3 s | DeepSeek V4 Pro, 1.2×cost $0.0008 and $0.0006 |
| A meeting note into German | Both passed | Gemini 3.8 Flash, 1.4×took 3.0 s and 4.3 s | Gemini 3.8 Flash, 2.3×cost $0.0006 and $0.0015 |
| Idioms into natural Japanese | Both passed | DeepSeek V4 Pro, 1.7×took 4.7 s and 2.7 s | Gemini 3.8 Flash, 1.4×cost $0.0008 and $0.0011 |
| A lease clause into Brazilian Portuguese | Both passed | Gemini 3.8 Flash, 8.0×took 2.0 s and 16.4 s | Gemini 3.8 Flash, 3.0×cost $0.0008 and $0.0024 |
| Customers in one country | Both passed | DeepSeek V4 Pro, 2.6×took 3.1 s and 1.2 s | DeepSeek V4 Pro, 1.2×cost $0.0005 and $0.0004 |
| Count orders by status | Both passed | DeepSeek V4 Pro, 3.4×took 3.7 s and 1.1 s | DeepSeek V4 Pro, 1.2×cost $0.0005 and $0.0004 |
| Revenue by category | Both passed | Gemini 3.8 Flash, 2.7×took 3.0 s and 8.0 s | Gemini 3.8 Flash, 3.4×cost $0.0008 and $0.0025 |
| Every customer, even those without orders | Both passed | Gemini 3.8 Flash, 2.8×took 3.7 s and 10.4 s | Gemini 3.8 Flash, 4.1×cost $0.0008 and $0.0032 |
| Monthly revenue with a running total | Both passed | Gemini 3.8 Flash, 3.6×took 4.7 s and 16.6 s | Gemini 3.8 Flash, 2.9×cost $0.0012 and $0.0036 |
| A fact from one section | Both passed | DeepSeek V4 Pro, 2.9×took 3.1 s and 1.1 s | DeepSeek V4 Pro, 1.2×cost $0.0006 and $0.0005 |
| Core hours and start times | Both passed | DeepSeek V4 Pro, 3.5×took 2.9 s and 0.8 s | DeepSeek V4 Pro, 1.8×cost $0.0006 and $0.0004 |
| Two sections in one answer | Both passed | DeepSeek V4 Pro, 1.5×took 3.1 s and 2.1 s | Gemini 3.8 Flash, 1.2×cost $0.0006 and $0.0008 |
| A later amendment changes the answer | Both passed | DeepSeek V4 Pro, 1.6×took 4.1 s and 2.5 s | Closecost $0.0009 and $0.0009 |
| A question the handbook doesn't answer | Both passed | Gemini 3.8 Flash, 3.0×took 2.9 s and 8.8 s | Closecost $0.0006 and $0.0005 |
| Pick the tool and work out the date | Both passed | DeepSeek V4 Pro, 1.2×took 1.9 s and 1.6 s | Closecost $0.0005 and $0.0005 |
| Convert a currency | Both passed | DeepSeek V4 Pro, 4.8×took 4.4 s and 0.9 s | DeepSeek V4 Pro, 1.8×cost $0.0008 and $0.0004 |
| Book a meeting from a sentence | Both passed | DeepSeek V4 Pro, 2.7×took 6.3 s and 2.3 s | DeepSeek V4 Pro, 1.4×cost $0.0012 and $0.0008 |
| Search, but don't book | Both passed | DeepSeek V4 Pro, 4.4×took 6.3 s and 1.4 s | DeepSeek V4 Pro, 1.3×cost $0.0009 and $0.0007 |
| Two calls with a unit conversion | Both passed | Closetook 3.9 s and 3.7 s | DeepSeek V4 Pro, 1.2×cost $0.0010 and $0.0008 |
Gemini 3.8 Flash vs DeepSeek V4 Pro in our test runs
Gemini 3.8 Flash and DeepSeek V4 Pro on the same prompts, job by job: how many replies passed their check.
Based on 100 of our test runs on , through OpenRouter with the app's own prompt and settings. Updated .
| Job | Gemini 3.8 Flash | DeepSeek V4 Pro |
|---|---|---|
| Coding | 5 of 5 | 5 of 5 |
| Writing | 3 of 5 | 5 of 5 |
| Math | 5 of 5 | 5 of 5 |
| Summarization | 5 of 5 | 5 of 5 |
| Data analysis | 4 of 5 | 5 of 5 |
| Customer support | 4 of 5 | 4 of 5 |
| Translation | 5 of 5 | 5 of 5 |
| SQL | 5 of 5 | 5 of 5 |
| RAG and answering from documents | 5 of 5 | 5 of 5 |
| Agents and tool use | 5 of 5 | 5 of 5 |
| All jobs | 46 of 50 · 1 message each · $0.0013 a reply | 49 of 50 · 1 message each · $0.0037 a reply |
The same prompts, sent to both through llmwise's own pipeline and checked the same way: five for each job. A bold count is the one that passed more. Messages: what each reply counted as on Pro. Cost: what OpenRouter charged us per reply, on average. Every prompt, and how it's scored.
Where they differed most, writing: both replies to a prompt only one of them passed.
An everyday prompt: “Rewrite corporate jargon in plain words”, in full.
Gemini 3.8 Flash
Failed: Graded 3.7 of 5 on average (lowest 3).
By having different teams work together in the third quarter, we refocused our business on customer needs. This effort paid off: client retention rates increased by 12%, and the rate at which enterprise clients canceled dropped by 0.30% (30 basis points). At the same time, we streamlined and balanced our communication channels to make better use of our team’s time and resources.
447 tokens in, 81 out · 3.1 s · $0.0006 · 1 message on Pro · answered by google/gemini-3.8-flash via Google ·
DeepSeek V4 Pro
Passed: Graded 4.3 of 5 on average (lowest 4).
In the third quarter, our teams worked together to focus more on customers. This produced a 12% increase in customer retention and a 0.30 percentage point drop in churn among business customers. We also fine-tuned our various customer contact channels to use resources more efficiently.
431 tokens in, 576 out (518 of them reasoning) · 5.8 s · $0.0024 · 1 message on Pro · answered by deepseek/deepseek-v4-pro-0813 via Wafer ·
Gemini 3.8 Flash and DeepSeek V4 Pro on every plan
Whether the one-time free trial reaches each model, then each paid plan's messages on it.
| Plan | Price | Gemini 3.8 Flash | DeepSeek V4 Pro |
|---|---|---|---|
| Free | $0 | In the one-time trial of 5 messages | In the one-time trial of 5 messages |
| Pro | $20 a month | Up to 250 a month | Up to 250 a month |
| Max | $50 a month | Up to 800 a month | Up to 800 a month |
| Ultra | $100 a month | Up to 1,800 a month | Up to 1,800 a month |
| Studio | $200 a month | Up to 4,000 a month | Up to 4,000 a month |
Prices don't include tax, which is added where it applies and shown before you pay. A paid plan's month is one allowance shared by every model, so each monthly count is the most you get if all of it goes to that model. It renews each billing period; everyday models refill daily at 00:00 UTC. Long chats count more per reply. How pricing works.
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.
What differs
Messages on Pro
They cost the same in llmwise: up to 250 messages a month on Pro on either.
Context window
Both take up to 1.05M tokens of context. A chat in llmwise holds up to 200k tokens, which fits in either, so the difference shows only through each maker's own API.
Images and PDFs
DeepSeek V4 Pro doesn't read images. DeepSeek V4 Pro gets a PDF's text rather than the file itself.
On Free
Both are in the free trial.
Where messages go
Gemini 3.8 Flash: Sent to Google directly. DeepSeek V4 Pro: Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked.
Fact by fact
| Fact | Gemini 3.8 Flash | DeepSeek V4 Pro |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Reads images | Yes | No |
| PDFs | Whole file | Text only |
| Reasoning | Yes | Yes |
| API price (October 2026) | $0.75 in / $3.75 out per million tokens | $0.40 in / $4.00 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0056 | $0.0044 |
| A $10 top-up adds | 200 messages | 200 messages |
| Where a message goes | Sent to Google directly. | Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked. |
| If the provider fails | If Google fails before the reply starts (an overload, a server error, a dropped connection), llmwise sends the same request to Gemini 3.8 Flash through OpenRouter instead. | When one host is down, OpenRouter moves the request to another host that meets the same rules. |
| Anthropic's safety fallback | Doesn't apply | Doesn't apply |
Gemini 3.8 Flash or DeepSeek V4 Pro?
From the facts above and our test runs: the rest is how their answers suit your work, which one chat can show you.
Pick Gemini 3.8 Flash: it reads images; it reads a PDF as the whole file, charts and scans included.
Pick DeepSeek V4 Pro: it costs its maker less to run ($0.0044 a typical message at API prices), though in llmwise the count is the same.
Each model's page, the families, and other pairs
Gemini 3.8 Flash vs DeepSeek V4 Pro is one pair of models. The page below covers the whole families.
- Gemini 3.8 Flash: price, limits and messages on every plan
- DeepSeek V4 Pro: price, limits and messages on every plan
- DeepSeek vs Gemini
- Gemini 3.8 Flash vs DeepSeek V4.1 Flash
- Claude Sonnet 5 vs Gemini 3.8 Flash
- Claude Haiku 4.5 vs Gemini 3.8 Flash
- Claude Opus 5.5 vs DeepSeek V4 Pro
- DeepSeek V4 Pro vs Kimi K3
- DeepSeek V4 Pro vs GLM 5.3
- Every model-vs-model page
Gemini 3.8 Flash is a Gemini model; DeepSeek V4 Pro is a DeepSeek model.
Questions
Is Gemini 3.8 Flash or DeepSeek V4 Pro cheaper in llmwise?
They cost the same in llmwise: up to 250 messages a month on Pro on either. Every paid plan's monthly allowance is shared by all models, so each count is the most you get if it all goes to that model.
Can I try Gemini 3.8 Flash and DeepSeek V4 Pro for free?
Yes: both are in the free trial of 5 messages.
Which has the bigger context window, Gemini 3.8 Flash or DeepSeek V4 Pro?
Neither: both take 1.05M tokens. A chat in llmwise holds up to 200k tokens, which fits in either, so the difference shows only through each maker's own API.
Can I use Gemini 3.8 Flash and DeepSeek V4 Pro in the same chat?
Yes. Pick Gemini 3.8 Flash for one message and DeepSeek V4 Pro for the next; the second sees the whole chat, including the first one's answer.
Which did better in your test runs, Gemini 3.8 Flash or DeepSeek V4 Pro?
On the same 50 prompts, run on October 8, 2026, Gemini 3.8 Flash passed 46 and DeepSeek V4 Pro passed 49. The table on this page has each job, and every reply is published.
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.