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GPT-5.5 (low) vs GPT-6 Astra (medium)

The average score is effectively tied at 9.5 vs 9.5. GPT-5.5 (low) has the lower benchmark cost at $1.822 vs $2.707. GPT-6 Astra (medium) is faster at 9.90s vs 11.91s, with pass rates of 87.0% vs 91.3%.

Last updated at: 2026-10-19

Compared models

Rank
#23
Total Output Tokens
31,065
Response Time (avg)
11.91s
Total Cost
$1.822
Rank
#21
Total Output Tokens
21,045
Response Time (avg)
9.90s
Total Cost
$2.707
Recommended model GPT-5.5 (low)

It has the strongest score in this comparison (9.5) and the best overall balance of cost and response time across 2 models.

Detailed comparison

Metric GPT-5.5 GPT-5.5 low Release: 2026-04-24 GPT-6 Astra GPT-6 Astra medium Release: 2026-09-04
Score 9.5 9.5
Rank #23 #21
Reliability 10.0 9.9
Consistency 10.0 9.3
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 87.0% 91.3%
Flaky tests 0 2
Total Runs 69 69
Cost per result 9.109 13.535
Total Cost $1.822 $2.707
Input Price $5.000 / 1M $10.000 / 1M
Output Price $30.000 / 1M $50.000 / 1M
Cache Read Price $0.500 / 1M $1.000 / 1M
Cache Write Price N/A $12.500 / 1M
Total Input Tokens 177,939 165,464
Output Tokens 6,283 5,591
Reasoning Tokens 24,782 15,454
Response Time (avg) 11.91s 9.90s
Response Time (max) 56.19s 73.48s
Response Time (total) 273.82s 227.67s
Parameters ~1.5T total (~100B active) ~2T total (~150B 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.

#23 GPT-5.5

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

#21 GPT-6 Astra

medium
Cost
$0.231
Time
81.0s
Tokens
4,708 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-6 Astra 10.0 10.0 100.0% 0 4.95s 7,302 394 1,673

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