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Claude Opus 4.8 vs Claude Sonnet 5.5 (low)

The average score is effectively tied at 6.9 vs 6.9. Claude Sonnet 5.5 (low) has the lower benchmark cost at $0.909 vs $2.334. Claude Sonnet 5.5 (low) is faster at 7.46s vs 7.54s, with pass rates of 60.9% vs 46.4%.

Last updated at: 2026-10-09

Compared models

Rank
#179
Total Output Tokens
24,343
Response Time (avg)
7.54s
Total Cost
$2.334
Rank
#178
Total Output Tokens
32,443
Response Time (avg)
7.46s
Total Cost
$0.909
Recommended model Claude Sonnet 5.5 (low)

It has the best score here (6.9), while costing about 2.6x less than Claude Opus 4.8.

Detailed comparison

Metric Claude Opus 4.8 Claude Opus 4.8 none Release: 2026-05-28 Claude Sonnet 5.5 Claude Sonnet 5.5 low Release: 2026-09-29
Score 6.9 6.9
Rank #179 #178
Reliability 10.0 10.0
Consistency 9.3 9.4
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 60.9% 46.4%
Flaky tests 2 2
Total Runs 69 69
Cost per result 17.953 9.082
Total Cost $2.334 $0.909
Input Price $5.000 / 1M $2.000 / 1M
Output Price $25.000 / 1M $10.000 / 1M
Cache Read Price $0.500 / 1M $0.200 / 1M
Cache Write Price $6.250 / 1M $2.500 / 1M
Total Input Tokens 345,059 291,853
Output Tokens 24,343 24,116
Reasoning Tokens 0 8,327
Response Time (avg) 7.54s 7.46s
Response Time (max) 65.07s 46.61s
Response Time (total) 173.31s 171.47s
Parameters ~5T total (~500B active) ~1T total (~100B 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.

#179 Claude Opus 4.8

none
Cost
$0.053
Time
22.0s
Tokens
2,253 tok

#178 Claude Sonnet 5.5

low
Cost
$0.020
Time
15.3s
Tokens
2,077 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 4.8 5.5 10.0 33.3% 0 3.29s 10,590 1,332 0
Claude Sonnet 5.5 3.2 9.7 0.0% 0 5.81s 10,608 5,903 0

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