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GPT 5.3 Chat vs GPT-5.6 Terra (low)

The average score is effectively tied at 7.5 vs 7.5. GPT-5.6 Terra (low) has the lower benchmark cost at $0.420 vs $0.533. GPT-5.6 Terra (low) is faster at 5.45s vs 6.56s, with pass rates of 65.2% vs 74.2%.

Last updated at: 2026-08-29

Rank
#86
Total Output Tokens
28,179
Response Time (avg)
6.56s
Total Cost
$0.533
Rank
#84
Total Output Tokens
21,586
Response Time (avg)
5.45s
Total Cost
$0.420
Recommended model GPT-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.

Detailed comparison

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 #86 #84
Reliability 10.0 10.0
Consistency 8.6 7.9
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 65.2% 74.2%
Flaky tests 4 6
Total Runs 66 66
Cost per result 4.097 3.954
Total Cost $0.533 $0.420
Input Price $1.750 / 1M $2.000 / 1M
Output Price $14.000 / 1M $12.000 / 1M
Total Input Tokens 78,846 80,304
Output Tokens 28,179 4,714
Reasoning Tokens 0 16,872
Response Time (avg) 6.56s 5.45s
Response Time (max) 18.33s 19.85s
Response Time (total) 137.77s 119.83s
Parameters ~400B total (~17B active) ~1T total (~60B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#86 GPT 5.3 Chat

none
Cost
$0.008
Time
8.1s
Tokens
634 tok

#84 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

Quick Compare

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