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OpenAI: GPT-5.3 Chat vs OpenAI: GPT-5.5

GPT-5.5 (low) leads on average score with 9.3 vs 7.5. GPT-5.3 Chat has the lower benchmark cost at $0.571 vs $1.253. GPT-5.3 Chat is faster at 6.88s vs 10.13s, with pass rates of 68.2% vs 86.4%.

Recommended modelGPT-5.5 (low)It has the strongest score in this comparison (9.3) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-17

Metric GPT-5.3 Chat GPT-5.3 Chat none Release: 2026-03-03 GPT-5.5 GPT-5.5 low Release: 2026-04-24
Score 7.5 9.3
Rank #52 #6
Reliability 10.0 10.0
Consistency 8.2 10.0
Tests Correct
Attempt pass rate 68.2% 86.4%
Flaky tests 5 0
Total Runs 66 66
Cost per result 4.387 6.594
Total Cost $0.571 $1.253
Input Price $1.750 / 1M $5.000 / 1M
Output Price $14.000 / 1M $30.000 / 1M
Total Input Tokens 78,990 80,058
Output Tokens 30,854 5,378
Reasoning Tokens 0 23,040
Response Time (avg) 6.88s 10.13s
Response Time (max) 18.33s 56.19s
Response Time (total) 151.31s 222.82s

Hamster playing table tennis

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

#52 GPT-5.3 Chat

none
Cost
$0.008
Time
8.1s
Tokens
634 tok

#6 GPT-5.5

low
Cost
$0.068
Time
37.0s
Tokens
2,339 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 6,632 0
GPT-5.5 10.0 10.0 100.0% 0 15.04s 7,302 423 6,402

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