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OpenAI: GPT-5.3 Chat vs OpenAI: GPT-5.6 Terra

The average score is effectively tied at 7.5 vs 7.5. GPT-5.6 Terra (low) has the lower benchmark cost at $0.519 vs $0.571. GPT-5.6 Terra (low) is faster at 5.31s vs 6.88s, with pass rates of 68.2% vs 74.2%.

Recommended modelGPT-5.6 Terra (low)It has the strongest score in this comparison (7.5) 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-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09
Score 7.5 7.5
Rank #52 #53
Reliability 10.0 10.0
Consistency 8.2 7.9
Tests Correct
Attempt pass rate 68.2% 74.2%
Flaky tests 5 6
Total Runs 66 66
Cost per result 4.387 3.989
Total Cost $0.571 $0.519
Input Price $1.750 / 1M $2.500 / 1M
Output Price $14.000 / 1M $15.000 / 1M
Total Input Tokens 78,990 80,295
Output Tokens 30,854 4,714
Reasoning Tokens 0 16,469
Response Time (avg) 6.88s 5.31s
Response Time (max) 18.33s 19.85s
Response Time (total) 151.31s 116.82s

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

#53 GPT-5.6 Terra

low
Cost
$0.034
Time
16.8s
Tokens
2,348 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-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821

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