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Claude Sonnet 5.5 (xhigh) vs Gemini 2.5 Flash (medium)

Claude Sonnet 5.5 (xhigh) leads on average score with 8.3 vs 8.2. Gemini 2.5 Flash (medium) has the lower benchmark cost at $0.644 vs $1.069. Claude Sonnet 5.5 (xhigh) is faster at 13.17s vs 21.14s, with pass rates of 78.8% vs 71.2%.

Last updated at: 2026-09-29

Compared models

Rank
#79
Total Output Tokens
77,105
Response Time (avg)
13.17s
Total Cost
$1.069
Rank
#83
Total Output Tokens
241,365
Response Time (avg)
21.14s
Total Cost
$0.644
Recommended model Gemini 2.5 Flash (medium)

Its score stays close to the best score here (8.2 vs 8.3), while costing about 1.7x less than Claude Sonnet 5.5 (xhigh).

Detailed comparison

Metric Claude Sonnet 5.5 Claude Sonnet 5.5 xhigh Release: 2026-09-29 Gemini 2.5 Flash Gemini 2.5 Flash medium Release: 2025-06-17
Score 8.3 8.2
Rank #79 #83
Reliability 10.0 10.0
Consistency 8.7 9.6
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 78.8% 71.2%
Flaky tests 4 1
Total Runs 66 66
Cost per result 7.123 4.288
Total Cost $1.069 $0.644
Input Price $2.000 / 1M $0.300 / 1M
Output Price $10.000 / 1M $2.500 / 1M
Total Input Tokens 148,643 132,507
Output Tokens 9,700 12,739
Reasoning Tokens 67,405 228,626
Response Time (avg) 13.17s 21.14s
Response Time (max) 54.91s 140.50s
Response Time (total) 289.67s 465.10s
Parameters ~1T total (~100B active) ~350B 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.

#79 Claude Sonnet 5.5

xhigh
Cost
$0.319
Time
258.6s
Tokens
31,969 tok

#83 Gemini 2.5 Flash

medium
No output was saved. The original provider response or failure reason is unavailable.
Cost
$0.000
Time
274.0s
Tokens
0 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
Claude Sonnet 5.5 8.2 7.2 88.9% 1 11.90s 10,608 555 9,501
Gemini 2.5 Flash 7.8 10.0 66.7% 0 41.01s 6,669 543 32,303

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