Model vs model
Gemini 3.8 Flash vs Kimi K3
Gemini 3.8 Flash and Kimi K3 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 Kimi K3 page. Updated .
Short answer
Gemini 3.8 Flash gets twice as many messages: up to 250 messages a month on Pro, against up to 125 messages a month for Kimi K3. Otherwise, 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 Kimi K3 46; 6 prompts split them, most on summarization (5 to 3).
Gemini 3.8 Flash vs Kimi K3, prompt by prompt
Every prompt Gemini 3.8 Flash and Kimi K3 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 43, only Gemini 3.8 Flash passed 3, only Kimi K3 passed 3, and neither passed 1. Gemini 3.8 Flash answered sooner on 18 of the 50 and Kimi K3 on 27; the rest were within 10% of each other. The 50 replies cost $0.0644 on Gemini 3.8 Flash and $0.1938 on Kimi K3: 3.0× less on Gemini 3.8 Flash.
The 6 prompts only one of Gemini 3.8 Flash and Kimi K3 passed
Rewrite corporate jargon in plain words (writing): Kimi K3 passed and Gemini 3.8 Flash didn't. Gemini 3.8 Flash: Graded 3.7 of 5 on average (lowest 3). Kimi K3: Graded 4.3 of 5 on average (lowest 4).
An article in three bullets (summarization): Gemini 3.8 Flash passed and Kimi K3 didn't. Gemini 3.8 Flash: Graded 4.3 of 5 on average (lowest 4). Kimi K3: Graded 4.0 of 5 on average (lowest 3); but 62 words, over the 60 allowed.
An email thread in one sentence (summarization): Gemini 3.8 Flash passed and Kimi K3 didn't. Gemini 3.8 Flash: Graded 4.7 of 5 on average (lowest 4). Kimi K3: Graded 5.0 of 5 on average (lowest 5); but 32 words, over the 30 allowed.
Correlation between ad spend and sign-ups (data analysis): Kimi K3 passed and Gemini 3.8 Flash didn't. Gemini 3.8 Flash: Final answer 0.91; expected 0.97. Kimi K3: Final answer 0.97: right.
A frustrated customer (customer support): Kimi K3 passed and Gemini 3.8 Flash didn't. Gemini 3.8 Flash: Graded 3.0 of 5 on average (lowest 2). Kimi K3: Graded 4.0 of 5 on average (lowest 3).
A refund request outside the window (customer support): Gemini 3.8 Flash passed and Kimi K3 didn't. Gemini 3.8 Flash: Graded 4.3 of 5 on average (lowest 4). Kimi K3: Graded 4.0 of 5 on average (lowest 2).
Job by job, the widest gaps first
Summarization: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 3 of 5. Kimi K3 answered 1.1× sooner at the median, 3.7 s against 3.4 s. Gemini 3.8 Flash cost 4.5× less, $0.0038 against $0.0172 for the 5 replies. Kimi K3's replies ran 15% longer, in tokens of reply, thinking not counted.
Writing: Gemini 3.8 Flash passed 3 of 5 and Kimi K3 4 of 5. Kimi K3 answered 1.3× sooner at the median, 3.9 s against 3.0 s. Gemini 3.8 Flash cost 2.9× less, $0.0066 against $0.0192 for the 5 replies. Their replies ran to about the same length.
Data analysis: Gemini 3.8 Flash passed 4 of 5 and Kimi K3 5 of 5. Kimi K3 answered 1.5× sooner at the median, 5.4 s against 3.5 s. Gemini 3.8 Flash cost 2.5× less, $0.0138 against $0.0339 for the 5 replies. Gemini 3.8 Flash's replies ran 155% longer, in tokens of reply, thinking not counted.
Translation: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 5 of 5. Gemini 3.8 Flash answered 1.7× sooner at the median, 3.0 s against 5.2 s. Gemini 3.8 Flash cost 4.8× less, $0.0037 against $0.0179 for the 5 replies. Kimi K3's replies ran 98% longer, in tokens of reply, thinking not counted.
Coding: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 5 of 5. Their median waits were close, 4.2 s against 4.1 s. Gemini 3.8 Flash cost 3.2× less, $0.0098 against $0.0316 for the 5 replies. Gemini 3.8 Flash's replies ran 35% longer, in tokens of reply, thinking not counted.
SQL: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 5 of 5. Kimi K3 answered 2.3× sooner at the median, 3.7 s against 1.6 s. Gemini 3.8 Flash cost 3.2× less, $0.0037 against $0.0118 for the 5 replies. Gemini 3.8 Flash's replies ran 10% longer, in tokens of reply, thinking not counted.
Agents and tool use: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 5 of 5. Kimi K3 answered 2.2× sooner at the median, 4.4 s against 2.0 s. Gemini 3.8 Flash cost 3.1× less, $0.0043 against $0.0135 for the 5 replies. Kimi K3's replies ran 13% longer, in tokens of reply, thinking not counted.
Customer support: Gemini 3.8 Flash passed 4 of 5 and Kimi K3 4 of 5. Gemini 3.8 Flash answered 1.2× sooner at the median, 3.7 s against 4.3 s. Gemini 3.8 Flash cost 2.8× less, $0.0082 against $0.0228 for the 5 replies. Kimi K3's replies ran 13% longer, in tokens of reply, thinking not counted.
Math: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 5 of 5. Gemini 3.8 Flash answered 1.1× sooner at the median, 4.7 s against 5.4 s. Gemini 3.8 Flash cost 2.6× less, $0.0071 against $0.0187 for the 5 replies. Gemini 3.8 Flash's replies ran 94% longer, in tokens of reply, thinking not counted.
RAG and answering from documents: Gemini 3.8 Flash passed 5 of 5 and Kimi K3 5 of 5. Kimi K3 answered 1.2× sooner at the median, 3.1 s against 2.6 s. Gemini 3.8 Flash cost 2.2× less, $0.0033 against $0.0073 for the 5 replies. Kimi K3's replies ran 14% 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 | Kimi K3, 1.6×took 4.2 s and 2.6 s | Gemini 3.8 Flash, 4.0×cost $0.0009 and $0.0035 |
| Parse a duration like “1h 30m” | Both passed | Gemini 3.8 Flash, 3.1×took 2.3 s and 7.1 s | Gemini 3.8 Flash, 6.1×cost $0.0010 and $0.0063 |
| Merge overlapping intervals | Both passed | Kimi K3, 1.9×took 3.8 s and 2.0 s | Gemini 3.8 Flash, 3.0×cost $0.0012 and $0.0036 |
| Evaluate an arithmetic expression, no eval | Both passed | Gemini 3.8 Flash, 1.5×took 6.7 s and 9.9 s | Gemini 3.8 Flash, 2.5×cost $0.0045 and $0.0113 |
| Parse CSV with quoted fields | Both passed | Kimi K3, 1.2×took 5.0 s and 4.1 s | Gemini 3.8 Flash, 3.2×cost $0.0022 and $0.0069 |
| Announce a second bakery shop on LinkedIn | Both passed | Closetook 3.9 s and 3.9 s | Gemini 3.8 Flash, 5.0×cost $0.0009 and $0.0046 |
| Rewrite corporate jargon in plain words | Only Kimi K3 | Kimi K3, 1.6×took 3.1 s and 2.0 s | Gemini 3.8 Flash, 4.7×cost $0.0006 and $0.0030 |
| Decline a meeting and offer two times | Both passed | Kimi K3, 1.2×took 3.5 s and 3.0 s | Gemini 3.8 Flash, 4.4×cost $0.0008 and $0.0034 |
| A product announcement with five rules | Neither passed | Kimi K3, 3.3×took 7.6 s and 2.3 s | Closecost $0.0031 and $0.0033 |
| Argue both sides of free buses | Both passed | Kimi K3, 1.5×took 5.2 s and 3.6 s | Gemini 3.8 Flash, 4.3×cost $0.0011 and $0.0049 |
| A discount, then sales tax | Both passed | Gemini 3.8 Flash, 2.0×took 2.5 s and 5.0 s | Gemini 3.8 Flash, 5.6×cost $0.0007 and $0.0037 |
| Pens at 3 for $4 | Both passed | Gemini 3.8 Flash, 1.1×took 4.7 s and 5.4 s | Gemini 3.8 Flash, 2.8×cost $0.0017 and $0.0046 |
| Compound interest over three years | Both passed | Gemini 3.8 Flash, 2.8×took 2.1 s and 5.9 s | Gemini 3.8 Flash, 5.1×cost $0.0009 and $0.0044 |
| Four-digit numbers whose digits sum to 9 | Both passed | Gemini 3.8 Flash, 1.3×took 4.7 s and 6.0 s | Gemini 3.8 Flash, 1.5×cost $0.0022 and $0.0032 |
| The highest of three dice is a 5 | Both passed | Kimi K3, 2.0×took 4.9 s and 2.4 s | Gemini 3.8 Flash, 1.5×cost $0.0018 and $0.0027 |
| An article in three bullets | Only Gemini 3.8 Flash | Kimi K3, 1.3×took 3.7 s and 2.8 s | Gemini 3.8 Flash, 3.9×cost $0.0007 and $0.0028 |
| An email thread in one sentence | Only Gemini 3.8 Flash | Gemini 3.8 Flash, 1.7×took 3.8 s and 6.4 s | Gemini 3.8 Flash, 5.6×cost $0.0005 and $0.0030 |
| Decisions and action items from a meeting | Both passed | Closetook 3.2 s and 3.4 s | Gemini 3.8 Flash, 4.6×cost $0.0009 and $0.0044 |
| A quarterly memo for the CEO | Both passed | Gemini 3.8 Flash, 3.9×took 4.0 s and 15.7 s | Gemini 3.8 Flash, 5.4×cost $0.0009 and $0.0049 |
| A study with a negative result | Both passed | Kimi K3, 1.1×took 3.6 s and 3.2 s | Gemini 3.8 Flash, 3.2×cost $0.0007 and $0.0021 |
| The region with the most revenue | Both passed | Kimi K3, 3.3×took 7.4 s and 2.2 s | Gemini 3.8 Flash, 1.3×cost $0.0038 and $0.0049 |
| Average order value in August | Both passed | Kimi K3, 1.7×took 4.4 s and 2.7 s | Gemini 3.8 Flash, 3.3×cost $0.0016 and $0.0054 |
| Revenue change from July to August | Both passed | Closetook 6.6 s and 6.4 s | Gemini 3.8 Flash, 1.8×cost $0.0037 and $0.0064 |
| A median, filtered two ways | Both passed | Closetook 3.5 s and 3.5 s | Gemini 3.8 Flash, 4.0×cost $0.0010 and $0.0042 |
| Correlation between ad spend and sign-ups | Only Kimi K3 | Gemini 3.8 Flash, 3.7×took 5.4 s and 20.2 s | Gemini 3.8 Flash, 3.5×cost $0.0037 and $0.0131 |
| A late order | Both passed | Kimi K3, 1.3×took 3.1 s and 2.5 s | Gemini 3.8 Flash, 4.9×cost $0.0009 and $0.0045 |
| A return inside the window | Both passed | Gemini 3.8 Flash, 1.5×took 2.9 s and 4.3 s | Gemini 3.8 Flash, 3.9×cost $0.0009 and $0.0033 |
| A frustrated customer | Only Kimi K3 | Gemini 3.8 Flash, 1.5×took 3.7 s and 5.6 s | Gemini 3.8 Flash, 5.8×cost $0.0011 and $0.0063 |
| A refund request outside the window | Only Gemini 3.8 Flash | Kimi K3, 2.3×took 5.9 s and 2.6 s | Gemini 3.8 Flash, 1.6×cost $0.0029 and $0.0045 |
| A message with a planted instruction | Both passed | Gemini 3.8 Flash, 1.6×took 7.3 s and 11.5 s | Gemini 3.8 Flash, 1.7×cost $0.0025 and $0.0041 |
| A delivery message into Spanish | Both passed | Kimi K3, 1.3×took 3.7 s and 2.9 s | Gemini 3.8 Flash, 4.0×cost $0.0008 and $0.0031 |
| A product description into French | Both passed | Gemini 3.8 Flash, 2.5×took 2.2 s and 5.4 s | Gemini 3.8 Flash, 4.9×cost $0.0008 and $0.0037 |
| A meeting note into German | Both passed | Closetook 3.0 s and 3.0 s | Gemini 3.8 Flash, 2.2×cost $0.0006 and $0.0014 |
| Idioms into natural Japanese | Both passed | Gemini 3.8 Flash, 1.1×took 4.7 s and 5.2 s | Gemini 3.8 Flash, 6.8×cost $0.0008 and $0.0053 |
| A lease clause into Brazilian Portuguese | Both passed | Gemini 3.8 Flash, 4.9×took 2.0 s and 10.1 s | Gemini 3.8 Flash, 5.5×cost $0.0008 and $0.0044 |
| Customers in one country | Both passed | Kimi K3, 2.8×took 3.1 s and 1.1 s | Gemini 3.8 Flash, 3.7×cost $0.0005 and $0.0018 |
| Count orders by status | Both passed | Kimi K3, 2.4×took 3.7 s and 1.5 s | Gemini 3.8 Flash, 1.8×cost $0.0005 and $0.0009 |
| Revenue by category | Both passed | Kimi K3, 1.9×took 3.0 s and 1.6 s | Gemini 3.8 Flash, 2.5×cost $0.0008 and $0.0019 |
| Every customer, even those without orders | Both passed | Kimi K3, 1.4×took 3.7 s and 2.5 s | Gemini 3.8 Flash, 3.9×cost $0.0008 and $0.0031 |
| Monthly revenue with a running total | Both passed | Kimi K3, 1.9×took 4.7 s and 2.5 s | Gemini 3.8 Flash, 3.4×cost $0.0012 and $0.0042 |
| A fact from one section | Both passed | Gemini 3.8 Flash, 2.1×took 3.1 s and 6.5 s | Gemini 3.8 Flash, 1.7×cost $0.0006 and $0.0010 |
| Core hours and start times | Both passed | Kimi K3, 2.4×took 2.9 s and 1.2 s | Gemini 3.8 Flash, 1.7×cost $0.0006 and $0.0011 |
| Two sections in one answer | Both passed | Kimi K3, 1.2×took 3.1 s and 2.6 s | Gemini 3.8 Flash, 3.0×cost $0.0006 and $0.0020 |
| A later amendment changes the answer | Both passed | Gemini 3.8 Flash, 1.2×took 4.1 s and 4.8 s | Gemini 3.8 Flash, 2.5×cost $0.0009 and $0.0022 |
| A question the handbook doesn't answer | Both passed | Kimi K3, 3.1×took 2.9 s and 0.9 s | Gemini 3.8 Flash, 1.8×cost $0.0006 and $0.0010 |
| Pick the tool and work out the date | Both passed | Gemini 3.8 Flash, 2.0×took 1.9 s and 3.7 s | Gemini 3.8 Flash, 6.3×cost $0.0005 and $0.0032 |
| Convert a currency | Both passed | Kimi K3, 1.5×took 4.4 s and 2.9 s | Gemini 3.8 Flash, 3.3×cost $0.0008 and $0.0025 |
| Book a meeting from a sentence | Both passed | Kimi K3, 4.0×took 6.3 s and 1.6 s | Gemini 3.8 Flash, 2.6×cost $0.0012 and $0.0031 |
| Search, but don't book | Both passed | Kimi K3, 3.2×took 6.3 s and 2.0 s | Gemini 3.8 Flash, 3.8×cost $0.0009 and $0.0034 |
| Two calls with a unit conversion | Both passed | Kimi K3, 2.3×took 3.9 s and 1.7 s | Gemini 3.8 Flash, 1.3×cost $0.0010 and $0.0012 |
Gemini 3.8 Flash vs Kimi K3 in our test runs
Gemini 3.8 Flash and Kimi K3 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 | Kimi K3 |
|---|---|---|
| Coding | 5 of 5 | 5 of 5 |
| Writing | 3 of 5 | 4 of 5 |
| Math | 5 of 5 | 5 of 5 |
| Summarization | 5 of 5 | 3 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 | 46 of 50 · 1 message each · $0.0039 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, summarization: both replies to a prompt only one of them passed.
An everyday prompt: “An article in three bullets”, in full.
Gemini 3.8 Flash
Passed: Graded 4.3 of 5 on average (lowest 4).
* Aldmoor's six-month trial increased daily bike trips from 900 to 2,300 and reduced cyclist injuries from nine to two. * Car traffic fell 14% with minor delays, while local shop owners reported mixed impacts on customer numbers. * The city council votes in November on making the lanes permanent, which would cost €1.1 million.
560 tokens in, 81 out · 3.7 s · $0.0007 · 1 message on Pro · answered by google/gemini-3.8-flash via Google ·
Kimi K3
Failed: Graded 4.0 of 5 on average (lowest 3); but 62 words, over the 60 allowed.
- Aldmoor's six-month protected bike lane trial on Market Street ended; the council votes in November on making them permanent. - Bike trips rose from 900 to 2,300 daily, cyclist injuries dropped from nine to two, while car traffic fell 14% with only slightly longer rush-hour drive times. - Businesses were split on customer impact; installation cost €410,000, with permanent lanes requiring €1.1 million more.
608 tokens in, 109 out (10 of them reasoning) · 2.8 s · $0.0028 · 1 message on Pro · answered by moonshotai/kimi-k3 via Phala ·
Gemini 3.8 Flash and Kimi K3 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 | Kimi K3 |
|---|---|---|---|
| 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 125 a month |
| Max | $50 a month | Up to 800 a month | Up to 400 a month |
| Ultra | $100 a month | Up to 1,800 a month | Up to 900 a month |
| Studio | $200 a month | Up to 4,000 a month | Up to 2,000 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
Gemini 3.8 Flash gets twice as many messages: up to 250 messages a month on Pro, against up to 125 messages a month for Kimi K3.
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
Both read images. Kimi K3 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. Kimi K3: 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 | Kimi K3 |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Reads images | Yes | Yes |
| PDFs | Whole file | Text only |
| Reasoning | Yes | Yes |
| API price (September 2026) | $0.75 in / $3.75 out per million tokens | $3.00 in / $15.00 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0056 | $0.0225 |
| A $10 top-up adds | 200 messages | 100 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 Kimi K3?
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: more messages for the money, up to 250 messages a month on Pro; it reads a PDF as the whole file, charts and scans included.
Each model's page, the families, and other pairs
Gemini 3.8 Flash vs Kimi K3 is one pair of models. The page below covers the whole families.
- Gemini 3.8 Flash: price, limits and messages on every plan
- Kimi K3: price, limits and messages on every plan
- Gemini vs Kimi
- 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 Fable 5.1 vs Kimi K3
- Kimi K3 vs GLM 5.3
- DeepSeek V4 Pro vs Kimi K3
- Every model-vs-model page
Gemini 3.8 Flash is a Gemini model; Kimi K3 is a Kimi model.
Questions
Is Gemini 3.8 Flash or Kimi K3 cheaper in llmwise?
Gemini 3.8 Flash gets twice as many messages: up to 250 messages a month on Pro, against up to 125 messages a month for Kimi K3. 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 Kimi K3 for free?
Yes: both are in the free trial of 5 messages.
Which has the bigger context window, Gemini 3.8 Flash or Kimi K3?
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 Kimi K3 in the same chat?
Yes. Pick Gemini 3.8 Flash for one message and Kimi K3 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 Kimi K3?
On the same 50 prompts, run on September 27, 2026, Gemini 3.8 Flash passed 46 and Kimi K3 passed 46. The table on this page has each job, and every reply is published.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, 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.