Gemini 3.8 Flash · Data analysis

Gemini 3.8 Flash for data analysis: our test runs

Gemini 3.8 Flash ran our 5 data analysis 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 September 27, 2026, through OpenRouter with the app's own prompt and settings.

Short answer

In our test runs on September 27, 2026, Gemini 3.8 Flash passed 4 of 5 of our data analysis prompts (1 of the 2 hard ones): tied 12th of 15 models. Each reply counted as 1 message on Pro, where it has 250 a month, and cost $0.0028 to run on average.

Prompt by prompt

Each of the 5 data analysis prompts, and how Gemini 3.8 Flash's reply did.

Gemini 3.8 Flash on each data analysis prompt
Prompt	Result	Cost	Time
The region with the most revenueEveryday	Passed: Final answer North, 1,085.00: right.	$0.0038	7.4 s
Average order value in AugustEveryday	Passed: Final answer 300.00: right.	$0.0016	4.4 s
Revenue change from July to AugustEveryday	Passed: Final answer 67.4%: right.	$0.0037	6.6 s
A median, filtered two waysHard	Passed: Final answer 6.25: right.	$0.0010	3.5 s
Correlation between ad spend and sign-upsHard	Failed: Final answer 0.91; expected 0.97.	$0.0037	5.4 s

Every data analysis reply from Gemini 3.8 Flash

The region with the most revenue

An everyday prompt: “The region with the most revenue”, in full.

Passed: Final answer North, 1,085.00: right.

**Working:**

Revenue per region:
- **West:**
  - Order 1001: 2 × $45.00 = $90.00
  - Order 1003: 1 × $310.00 = $310.00
  - Order 1007: 2 × $120.00 = $240.00
  - Order 1010: 5 × $45.00 = $225.00
  - **Total West:** $865.00

- **East:**
  - Order 1002: 1 × $120.00 = $120.00
  - Order 1005: 3 × $45.00 = $135.00
  - Order 1008: 1 × $310.00 = $310.00
  - Order 1011: 3 × $120.00 = $360.00
  - **Total East:** $925.00

- **North:**
  - Order 1004: 4 × $45.00 = $180.00
  - Order 1006: 2 × $120.00 = $240.00
  - Order 1009: 2 × $310.00 = $620.00
  - Order 1012: 1 × $45.00 = $45.00
  - **Total North:** $1,085.00

Final answer: North, $1,085.00

770 tokens in, 857 out (446 of them reasoning) · 7.4 s · $0.0038 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

Average order value in August

An everyday prompt: “Average order value in August”, in full.

Passed: Final answer 300.00: right.

**Working:**

Orders in August 2026:
* 1007: 2 × 120.00 = 240.00
* 1008: 1 × 310.00 = 310.00
* 1009: 2 × 310.00 = 620.00
* 1010: 5 × 45.00 = 225.00
* 1011: 3 × 120.00 = 360.00
* 1012: 1 × 45.00 = 45.00

Total revenue = 240.00 + 310.00 + 620.00 + 225.00 + 360.00 + 45.00 = 1,800.00  
Number of orders = 6  
Average revenue per order = 1,800.00 / 6 = 300.00

Final answer: 300.00

779 tokens in, 272 out · 4.4 s · $0.0016 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

Revenue change from July to August

An everyday prompt: “Revenue change from July to August”, in full.

Passed: Final answer 67.4%: right.

**July 2026 Revenue:**
* Order 1001: 2 × 45.00 = $90.00
* Order 1002: 1 × 120.00 = $120.00
* Order 1003: 1 × 310.00 = $310.00
* Order 1004: 4 × 45.00 = $180.00
* Order 1005: 3 × 45.00 = $135.00
* Order 1006: 2 × 120.00 = $240.00
* **July Total:** $1,075.00

**August 2026 Revenue:**
* Order 1007: 2 × 120.00 = $240.00
* Order 1008: 1 × 310.00 = $310.00
* Order 1009: 2 × 310.00 = $620.00
* Order 1010: 5 × 45.00 = $225.00
* Order 1011: 3 × 120.00 = $360.00
* Order 1012: 1 × 45.00 = $45.00
* **August Total:** $1,800.00

**Percentage Change:**
$$\frac{1,800 - 1,075}{1,075} \times 100 = \frac{725}{1,075} \times 100 \approx 67.4\%$$

Final answer: 67.4%

786 tokens in, 820 out (381 of them reasoning) · 6.6 s · $0.0037 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

A median, filtered two ways

A hard prompt: “A median, filtered two ways”, in full.

Passed: Final answer 6.25: right.

1. Filter for tickets where `team` is "Billing" and `priority` is "high":
   - T1: 5.5
   - T4: 2
   - T6: 9
   - T9: 7
   - T10: 26
   - T12: 4

2. Sort the values in ascending order:
   - 2, 4, 5.5, 7, 9, 26

3. Calculate the median of the 6 values (average of the 3rd and 4th values):
   - (5.5 + 7) / 2 = 12.5 / 2 = 6.25

Final answer: 6.25

551 tokens in, 169 out · 3.5 s · $0.0010 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

Correlation between ad spend and sign-ups

A hard prompt: “Correlation between ad spend and sign-ups”, in full.

Failed: Final answer 0.91; expected 0.97.

Let $x$ represent `ad_spend` and $y$ represent `signups`. The number of data points is $n = 8$.

**Data:**
- $x = [500, 800, 650, 1200, 900, 300, 1100, 700]$
- $y = [42, 55, 49, 71, 60, 35, 64, 58]$

**Summary Calculations:**
- $\sum x = 500 + 800 + 650 + 1200 + 900 + 300 + 1100 + 700 = 6150$
- $\sum y = 42 + 55 + 49 + 71 + 60 + 35 + 64 + 58 = 434$
- $\sum x^2 = 500^2 + 800^2 + 650^2 + 1200^2 + 900^2 + 300^2 + 1100^2 + 700^2 = 5,342,500$
- $\sum y^2 = 42^2 + 55^2 + 49^2 + 71^2 + 60^2 + 35^2 + 64^2 + 58^2 = 24,676$
- $\sum xy = (500)(42) + (800)(55) + (650)(49) + (1200)(71) + (900)(60) + (300)(35) + (1100)(64) + (700)(58)$
  $= 21,000 + 44,000 + 31,850 + 85,200 + 54,000 + 10,500 + 70,400 + 40,600 = 357,550$

**Pearson Correlation Formula:**
$$r = \frac{n\sum xy - (\sum x)(\sum y)}{\sqrt{[n\sum x^2 - (\sum x)^2][n\sum y^2 - (\sum y)^2]}}$$

- **Numerator:**
  $8(357,550) - (6150)(434) = 2,860,400 - 2,669,100 = 191,300$

- **Denominator:**
  $n\sum x^2 - (\sum x)^2 = 8(5,342,500) - 6150^2 = 42,740,000 - 37,822,500 = 4,917,500$
  $n\sum y^2 - (\sum y)^2 = 8(24,676) - 434^2 = 197,408 - 188,356 = 9,052$
  $\sqrt{4,917,500 \times 9,052} = \sqrt{44,513,210,000} \approx 210,981.54$

- **Correlation ($r$):**
  $r = \frac{191,300}{210,981.54} \approx 0.9067 \approx 0.91$

Final answer: 0.91

505 tokens in, 887 out · 5.4 s · $0.0037 · 1 message on Pro · answered by google/gemini-3.8-flash via Google · September 27, 2026

How it compares on data analysis

Gemini 3.8 Flash beside the job's picks among every model. 11 models share the hard-problems pick, and Gemini 3.8 Flash isn't one of them.

Gemini 3.8 Flash beside other models on data analysis
Model	Passed	On Pro	Cost per reply
DeepSeek V4 ProOur pick: hard problems (shared), best value	5 of 5	250 a month on Pro	$0.0016
GPT-6 LunaOur pick: hard problems (shared), everyday	5 of 5	60 a day on Pro	$0.0002
Gemini 3.8 Flash	4 of 5	250 a month on Pro	$0.0028

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: 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.

How the runs were done, and every data analysis prompt.

Gemini 3.8 Flash, and data analysis, elsewhere

Questions

Is Gemini 3.8 Flash good for data analysis?

In our test runs it passed 4 of 5 data analysis prompts, tied 12th 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 data analysis reply from Gemini 3.8 Flash use?

1 message each on Pro, where it has 250 a month 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.

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.

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