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Claude Opus 5.5 (low) vs GPT-6 Astra (xhigh)

GPT-6 Astra (xhigh) leads on average score with 9.9 vs 9.3. Claude Opus 5.5 (low) has the lower benchmark cost at $0.952 vs $5.156. Claude Opus 5.5 (low) is faster at 23.72s vs 28.44s, with pass rates of 87.9% vs 97.0%.

Last updated at: 2026-09-23

Compared models

Rank
#20
Total Output Tokens
21,004
Response Time (avg)
23.72s
Total Cost
$0.952
Rank
#6
Total Output Tokens
87,183
Response Time (avg)
28.44s
Total Cost
$5.156
Recommended model Claude Opus 5.5 (low)

Its score stays close to the best score here (9.3 vs 9.9), while costing about 5.4x less than GPT-6 Astra (xhigh).

Detailed comparison

Metric Claude Opus 5.5 Claude Opus 5.5 low Release: 2026-09-23 GPT-6 Astra GPT-6 Astra xhigh Release: 2026-09-04
Score 9.3 9.9
Rank #20 #6
Reliability 10.0 9.9
Consistency 9.3 9.6
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 87.9% 97.0%
Flaky tests 2 1
Total Runs 66 66
Cost per result 5.284 24.552
Total Cost $0.952 $5.156
Input Price $4.000 / 1M $10.000 / 1M
Output Price $20.000 / 1M $50.000 / 1M
Total Input Tokens 132,746 79,662
Output Tokens 6,454 5,055
Reasoning Tokens 14,550 82,128
Response Time (avg) 23.72s 28.44s
Response Time (max) 89.16s 381.11s
Response Time (total) 521.82s 625.68s
Parameters ~5T total (~500B active) ~2T total (~150B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#20 Claude Opus 5.5

low
Invalid SVG
Cost
$0.038
Time
19.1s
Tokens
2,010 tok

#6 GPT-6 Astra

xhigh
Cost
$0.694
Time
257.5s
Tokens
13,964 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
Claude Opus 5.5 10.0 10.0 100.0% 0 12.23s 10,608 575 2,777
GPT-6 Astra 10.0 10.0 100.0% 0 8.27s 7,302 396 4,031

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