Head to head · tested 27 Oct 2026

Gemini 3.8 Flash vs Gemini 4 Argon: accuracy, speed and price

Similar accuracy; Gemini 3.8 Flash costs less per question.

GoogleGemini 3.8 Flash82.5% score · #3$0.0037 per question142 tok/s

GoogleGemini 4 Argon84.8% score · #2$0.0063 per question69 tok/s

Verdict

Built from the measurements below

Accuracy is too close to call: Gemini 3.8 Flash scored 82.5% and Gemini 4 Argon 84.8% on the same 80 questions, a gap within what chance alone could produce.
Gemini 3.8 Flash is 1.7× cheaper per question as billed ($0.0037 vs $0.0063), reasoning tokens included.
Gemini 3.8 Flash generates text 2.1× faster: 142 tokens per second against 69.

Which should you choose?

Choose Gemini 3.8 Flash for the lower cost per correct answer ($0.0045 against $0.0074) and faster streaming. Choose Gemini 4 Argon for shorter outputs (about 558 tokens per question against 925).

Accuracy gap -2.3 points (z = -0.39). We call a winner only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.

Head to head

Same questions, same prompt, same API

Measure	Gemini 3.8 Flash	Gemini 4 Argon	Edge
Verification scoreHigher is better	82.5%	84.8%	Too close to call
Cost per questionLower is better	$0.0037	$0.0063	Gemini 3.8 Flash
Output speedHigher is better	142	69	Gemini 3.8 Flash
Time to first tokenLower is better	3.2 s	3.3 s	Similar
End-to-end response timeLower is better	5.6 s	9.9 s	Gemini 3.8 Flash
Tokens per questionLower is better	925	558	Gemini 4 Argon
Context windowHigher is better	1M	1M	Similar

Side by side

Bars are scaled to the larger of the two values. The winner on each measure is marked in bold.

Every measure

Gemini 3.8 Flash first, Gemini 4 Argon second

Verification scorehigher is better

Gemini 3.8 Flash82.5%

Gemini 4 Argon84.8%

Cost per questionlower is better

Gemini 3.8 Flash$0.0037

Gemini 4 Argon$0.0063

Output speedhigher is better

Gemini 3.8 Flash142

Gemini 4 Argon69

Time to first tokenlower is better

Gemini 3.8 Flash3.2 s

Gemini 4 Argon3.3 s

End-to-end response timelower is better

Gemini 3.8 Flash5.6 s

Gemini 4 Argon9.9 s

Tokens per questionlower is better

Gemini 3.8 Flash925

Gemini 4 Argon558

Context windowhigher is better

Gemini 3.8 Flash1M

Gemini 4 Argon1M

Score vs. cost per question

Both models in color, every other model in grey

Results by subject and dataset

Questions answered correctly. Small samples: a gap of one or two questions is noise.

Subject	Questions	Gemini 3.8 Flash	Gemini 4 Argon
Science	30	26/30	25/30
Engineering	15	12/15	13/14
Medicine	11	6/11	7/11
Economics	9	8/9	8/9
Law	6	6/6	6/6
Humanities & social science	9	8/9	8/9
SuperGPQA dataset	50	37/50	38/49
MMLU-Pro dataset	30	29/30	29/30

Specifications and pricing

From OpenRouter's catalogue, plus our test dates

Specification	Gemini 3.8 Flash	Gemini 4 Argon
Creator	Google	Google
Released	2 Sept 2026	13 Oct 2026
Weights	—	—
Reasoning	Yes	Yes
Input	text, image, video, file, audio	audio, file, image, text, video
Output	text	text
Context window	1M tokens	1M tokens
Knowledge cutoff	—	—
List price in / out per 1M	$0.825 / $4.125	$2 / $10
Blended price per 1M (3:1)	$1.65	$4.00
Cheapest host	Google AI Studio · $0.375 / $1.875	Google AI Studio · $1 / $5
Hosts on OpenRouter	2	2
Last tested	25 Oct 2026	25 Oct 2026

Compare any two models →

Gemini 3.8 Flash vs Gemini 4 Argon: frequently asked questions

Is Gemini 3.8 Flash better than Gemini 4 Argon?: On accuracy they are statistically tied: Gemini 3.8 Flash scored 82.5% and Gemini 4 Argon 84.8% on the same 80 questions from open datasets. Similar accuracy; Gemini 3.8 Flash costs less per question.
Which is cheaper, Gemini 3.8 Flash or Gemini 4 Argon?: Gemini 3.8 Flash is cheaper: $0.0037 per question as billed, against $0.0063. List prices: Gemini 3.8 Flash $0.825 in / $4.125 out, Gemini 4 Argon $2 in / $10 out per million tokens.
Which is faster, Gemini 3.8 Flash or Gemini 4 Argon?: Gemini 3.8 Flash is faster at 142 output tokens per second, against 69. Time to first token: 3.2 s for Gemini 3.8 Flash, 3.3 s for Gemini 4 Argon.
Which has the larger context window, Gemini 3.8 Flash or Gemini 4 Argon?: Both accept about the same amount of context: 1M and 1M tokens.

Measure

Gemini 3.8 Flash

Gemini 4 Argon

Edge

Verification scoreHigher is better

82.5%

84.8%

Too close to call

Cost per questionLower is better

$0.0037

$0.0063

Gemini 3.8 Flash

Output speedHigher is better

142

Gemini 3.8 Flash

Time to first tokenLower is better

3.2 s

3.3 s

Similar

End-to-end response timeLower is better

5.6 s

9.9 s

Gemini 3.8 Flash

Tokens per questionLower is better

925

558

Gemini 4 Argon

Context windowHigher is better

Similar

Subject

Questions

Gemini 3.8 Flash

Gemini 4 Argon

Science

26/30

25/30

Engineering

12/15

13/14

Medicine

6/11

7/11

Economics

8/9

Law

6/6

Humanities & social science

8/9

SuperGPQA dataset

37/50

38/49

MMLU-Pro dataset

29/30

Specification

Gemini 3.8 Flash

Gemini 4 Argon

Creator

Google

Released

2 Sept 2026

13 Oct 2026

Weights

—

Reasoning

Yes

Input

text, image, video, file, audio

audio, file, image, text, video

Output

text

Context window

1M tokens

Knowledge cutoff

—

List price in / out per 1M

$0.825 / $4.125

$2 / $10

Blended price per 1M (3:1)

$1.65

$4.00

Cheapest host

Google AI Studio · $0.375 / $1.875

Google AI Studio · $1 / $5

Hosts on OpenRouter

Last tested

25 Oct 2026

Gemini 3.8 Flash vs Gemini 4 Argon: frequently asked questions

Is Gemini 3.8 Flash better than Gemini 4 Argon?

On accuracy they are statistically tied: Gemini 3.8 Flash scored 82.5% and Gemini 4 Argon 84.8% on the same 80 questions from open datasets. Similar accuracy; Gemini 3.8 Flash costs less per question.

Which is cheaper, Gemini 3.8 Flash or Gemini 4 Argon?

Gemini 3.8 Flash is cheaper: $0.0037 per question as billed, against $0.0063. List prices: Gemini 3.8 Flash $0.825 in / $4.125 out, Gemini 4 Argon $2 in / $10 out per million tokens.

Which is faster, Gemini 3.8 Flash or Gemini 4 Argon?

Gemini 3.8 Flash is faster at 142 output tokens per second, against 69. Time to first token: 3.2 s for Gemini 3.8 Flash, 3.3 s for Gemini 4 Argon.

Which has the larger context window, Gemini 3.8 Flash or Gemini 4 Argon?

Both accept about the same amount of context: 1M and 1M tokens.

Gemini 3.8 Flash vs Gemini 4 Argon: accuracy, speed and price

Verdict

Which should you choose?

Head to head

Side by side

Every measure

Score vs. cost per question

Results by subject and dataset

Specifications and pricing

Related comparisons

Gemini 3.8 Flash vs Gemini 4 Argon: frequently asked questions

Gemini 3.8 Flash vs Gemini 4 Argon: accuracy, speed and price

Verdict

Which should you choose?

Head to head

Side by side

Every measure

Score vs. cost per question

Results by subject and dataset

Specifications and pricing

Related comparisons

Gemini 3.8 Flash vs Gemini 4 Argon: frequently asked questions