Navigate
AI BENCHY
Advertise here

Gemini 3.1 Pro Preview (medium) vs Gemini 3.8 Flash (medium)

Gemini 3.1 Pro Preview (medium) leads on average score with 9.2 vs 9.1. Gemini 3.8 Flash (medium) has the lower benchmark cost at $0.653 vs $1.352. Gemini 3.8 Flash (medium) is faster at 14.50s vs 20.62s, with pass rates of 90.9% vs 92.4%.

Last updated at: 2026-09-02

Rank
#13
Total Output Tokens
97,238
Response Time (avg)
20.62s
Total Cost
$1.352
Rank
#17
Total Output Tokens
154,908
Response Time (avg)
14.50s
Total Cost
$0.653
Recommended model Gemini 3.8 Flash (medium)

Its score stays close to the best score here (9.1 vs 9.2), while costing about 2.1x less than Gemini 3.1 Pro Preview (medium).

Detailed comparison

Metric Gemini 3.1 Pro Preview Gemini 3.1 Pro Preview medium Release: 2026-02-19 Gemini 3.8 Flash Gemini 3.8 Flash medium Release: 2026-09-02
Score 9.2 9.1
Rank #13 #17
Reliability 10.0 10.0
Consistency 10.0 9.3
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 90.9% 92.4%
Flaky tests 0 2
Total Runs 66 66
Cost per result 6.758 3.436
Total Cost $1.352 $0.653
Input Price $2.000 / 1M $0.750 / 1M
Output Price $12.000 / 1M $3.750 / 1M
Total Input Tokens 92,296 95,793
Output Tokens 5,232 7,066
Reasoning Tokens 92,006 147,842
Response Time (avg) 20.62s 14.50s
Response Time (max) 88.68s 108.60s
Response Time (total) 329.94s 318.92s
Parameters ~1.2T total (~20B active) ~500B total (~20B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#13 Gemini 3.1 Pro Preview

medium
Cost
$0.115
Time
87.2s
Tokens
9,629 tok

#17 Gemini 3.8 Flash

medium
Cost
$0.037
Time
54.6s
Tokens
9,712 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Gemini 3.1 Pro Preview 7.9 9.9 66.7% 0 40.17s 8,124 435 41,247
Gemini 3.8 Flash 8.0 9.9 66.7% 0 11.69s 8,118 454 19,433

Quick Compare

Switch Comparison Pair

Seed 2.1 TurbolowvsGemini 3.8 FlashmediumClaude Opus 5highvsGemini 3.1 Pro PreviewmediumGemini 3.1 Pro PreviewmediumvsGrok 4.6highGemini 3.1 Pro PreviewmediumvsGPT-5.5lowClaude Opus 5highvsGemini 3.8 FlashmediumClaude Fable 5.1highvsGemini 3.8 FlashmediumGemini 3.1 Pro PreviewmediumvsGPT-5.6 SolhighGemini 3.8 FlashmediumvsMuse Spark 1.3highSeed 2.1 TurbolowvsGemini 3.1 Pro PreviewmediumGemini 3.8 FlashmediumvsMuse Spark 1.3lowGemini 3.8 FlashmediumvsGrok 4.5highGemini 3.8 FlashmediumvsGrok 4.6high