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Gemini 3.5 Flash (high) vs GPT-5.3-Codex (medium)

Gemini 3.5 Flash (high) leads on average score with 9.4 vs 8.9. GPT-5.3-Codex (medium) has the lower benchmark cost at $0.988 vs $2.011. Gemini 3.5 Flash (high) is faster at 15.46s vs 16.91s, with pass rates of 89.4% vs 83.3%.

Last updated at: 2026-08-20

Rank
#6
Total Output Tokens
205,482
Response Time (avg)
15.46s
Total Cost
$2.011
Rank
#22
Total Output Tokens
60,374
Response Time (avg)
16.91s
Total Cost
$0.988
Recommended model GPT-5.3-Codex (medium)

Its score stays close to the best score here (8.9 vs 9.4), while costing about 2.0x less than Gemini 3.5 Flash (high).

Detailed comparison

Metric Gemini 3.5 Flash Gemini 3.5 Flash high Release: 2026-05-19 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 9.4 8.9
Rank #6 #22
Reliability 10.0 10.0
Consistency 9.3 8.6
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 89.4% 83.3%
Flaky tests 2 4
Total Runs 66 66
Cost per result 10.580 6.171
Total Cost $2.011 $0.988
Input Price $1.500 / 1M $1.750 / 1M
Output Price $9.000 / 1M $14.000 / 1M
Total Input Tokens 107,146 81,187
Output Tokens 8,777 6,258
Reasoning Tokens 196,705 54,116
Response Time (avg) 15.46s 16.91s
Response Time (max) 145.92s 100.93s
Response Time (total) 340.20s 372.03s
Parameters ~500B total (~20B active) ~1.2T total (~80B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#6 Gemini 3.5 Flash

high
Cost
$0.208
Time
118.2s
Tokens
23,158 tok

#22 GPT-5.3-Codex

medium
Cost
$0.049
Time
54.9s
Tokens
3,580 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 3.5 Flash 10.0 10.0 100.0% 0 22.96s 8,118 456 47,129
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890

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