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GPT-5.5 (medium) vs Grok 4.5 (high)

The average score is effectively tied at 9.0 vs 9.0. Grok 4.5 (high) has the lower benchmark cost at $2.252 vs $4.163. GPT-5.5 (medium) is faster at 38.97s vs 72.30s, with pass rates of 87.9% vs 86.4%.

Last updated at: 2026-08-29

Rank
#19
Total Output Tokens
125,316
Response Time (avg)
38.97s
Total Cost
$4.163
Rank
#21
Total Output Tokens
324,462
Response Time (avg)
72.30s
Total Cost
$2.252
Recommended model Grok 4.5 (high)

It has the best score here (9.0), while costing about 1.8x less than GPT-5.5 (medium).

Detailed comparison

Metric GPT-5.5 GPT-5.5 medium Release: 2026-04-24 Grok 4.5 Grok 4.5 high Release: 2026-07-08
Score 9.0 9.0
Rank #19 #21
Reliability 10.0 10.0
Consistency 8.9 8.9
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 87.9% 86.4%
Flaky tests 3 3
Total Runs 66 66
Cost per result 23.127 12.565
Total Cost $4.163 $2.252
Input Price $5.000 / 1M $2.000 / 1M
Output Price $30.000 / 1M $6.000 / 1M
Total Input Tokens 80,668 152,175
Output Tokens 5,617 5,655
Reasoning Tokens 119,699 318,807
Response Time (avg) 38.97s 72.30s
Response Time (max) 332.10s 676.83s
Response Time (total) 857.43s 1590.56s
Parameters ~1.5T total (~100B active) ~1.7T total (~170B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#19 GPT-5.5

medium
Cost
$0.112
Time
71.9s
Tokens
3,807 tok

#21 SpaceXAI: Grok 4.5

high
Cost
$0.015
Time
29.7s
Tokens
2,737 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
GPT-5.5 8.8 7.8 88.9% 1 59.77s 7,305 362 24,959
Grok 4.5 10.0 10.0 100.0% 0 155.16s 9,579 357 100,752

Quick Compare

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