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GPT-5.5 (low) vs GPT-5.6 Sol (low)

GPT-5.6 Sol (low) leads on average score with 9.5 vs 9.3. GPT-5.6 Sol (low) has the lower benchmark cost at $0.496 vs $1.257. GPT-5.6 Sol (low) is faster at 9.04s vs 10.15s, with pass rates of 86.4% vs 86.4%.

Last updated at: 2026-08-20

Rank
#10
Total Output Tokens
28,540
Response Time (avg)
10.15s
Total Cost
$1.257
Rank
#4
Total Output Tokens
19,946
Response Time (avg)
9.04s
Total Cost
$0.496
Recommended model GPT-5.6 Sol (low)

It has the best score here (9.5), while costing about 2.5x less than GPT-5.5 (low).

Detailed comparison

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 GPT-5.6 Sol GPT-5.6 Sol low Release: 2026-07-09
Score 9.3 9.5
Rank #10 #4
Reliability 10.0 10.0
Consistency 10.0 9.2
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 86.4% 86.4%
Flaky tests 0 2
Total Runs 66 66
Cost per result 6.614 5.508
Total Cost $1.257 $0.496
Input Price $5.000 / 1M $2.500 / 1M
Output Price $30.000 / 1M $15.000 / 1M
Total Input Tokens 80,067 78,580
Output Tokens 5,378 4,476
Reasoning Tokens 23,162 15,470
Response Time (avg) 10.15s 9.04s
Response Time (max) 56.19s 53.91s
Response Time (total) 223.24s 198.97s
Parameters ~1.5T total (~100B active) ~2T total (~150B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#10 GPT-5.5

low
Cost
$0.068
Time
37.0s
Tokens
2,339 tok

#4 GPT-5.6 Sol

low
Cost
$0.062
Time
26.7s
Tokens
2,150 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 10.0 10.0 100.0% 0 15.04s 7,302 423 6,402
GPT-5.6 Sol 10.0 10.0 100.0% 0 11.25s 7,302 412 3,482

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