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GPT 5.3 Chat (default) vs GPT-5.5

The average score is effectively tied at 6.7 vs 6.6. GPT 5.3 Chat (default) has the lower benchmark cost at $0.533 vs $1.212. GPT-5.5 is faster at 4.75s vs 6.31s, with pass rates of 62.3% vs 56.5%.

Last updated at: 2026-10-15

Compared models

Rank
#204
Total Output Tokens
28,179
Response Time (avg)
6.31s
Total Cost
$0.533
Rank
#208
Total Output Tokens
6,197
Response Time (avg)
4.75s
Total Cost
$1.212
Recommended model GPT 5.3 Chat (default)

It has the best score here (6.7), while costing about 2.3x less than GPT-5.5.

Detailed comparison

Metric GPT 5.3 Chat GPT 5.3 Chat default Release: 2026-03-03 GPT-5.5 GPT-5.5 none Release: 2026-04-24
Score 6.7 6.6
Rank #204 #208
Reliability 10.0 10.0
Consistency 8.6 9.3
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 62.3% 56.5%
Flaky tests 4 2
Total Runs 69 69
Cost per result 4.097 10.096
Total Cost $0.533 $1.212
Input Price $1.750 / 1M $5.000 / 1M
Output Price $14.000 / 1M $30.000 / 1M
Cache Read Price N/A $0.500 / 1M
Cache Write Price N/A N/A
Total Input Tokens 78,846 205,108
Output Tokens 7,635 6,197
Reasoning Tokens 20,544 0
Response Time (avg) 6.31s 4.75s
Response Time (max) 18.33s 57.53s
Response Time (total) 138.73s 109.31s
Parameters ~400B total (~17B active) ~1.5T total (~100B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#204 GPT 5.3 Chat

default
Cost
$0.008
Time
8.1s
Tokens
634 tok

#208 GPT-5.5

none
Cost
$0.090
Time
54.3s
Tokens
3,063 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 5.3 Chat 5.6 4.7 55.6% 2 10.52s 7,302 808 5,824
GPT-5.5 5.5 10.0 33.3% 0 1.35s 7,305 462 0

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