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Claude Opus 5.5 (low) vs Claude Opus 5 (high)

Claude Opus 5.5 (low) leads on average score with 9.4 vs 9.4. Claude Opus 5.5 (low) has the lower benchmark cost at $1.733 vs $4.524. Claude Opus 5 (high) is faster at 25.31s vs 25.68s, with pass rates of 88.4% vs 82.6%.

Last updated at: 2026-10-26

Compared models

Rank
#26
Total Output Tokens
25,006
Response Time (avg)
25.68s
Total Cost
$1.733
Rank
#30
Total Output Tokens
105,662
Response Time (avg)
25.31s
Total Cost
$4.524
Recommended model Claude Opus 5.5 (low)

It has the best score here (9.4), while costing about 2.6x less than Claude Opus 5 (high).

Detailed comparison

Metric Claude Opus 5.5 Claude Opus 5.5 low Release: 2026-09-23 Claude Opus 5 Claude Opus 5 high Release: 2026-07-25
Score 9.4 9.4
Rank #26 #30
Reliability 10.0 10.0
Consistency 9.3 10.0
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 88.4% 82.6%
Flaky tests 2 0
Total Runs 69 69
Cost per result 9.118 23.809
Total Cost $1.733 $4.524
Input Price $4.000 / 1M $5.000 / 1M
Output Price $20.000 / 1M $25.000 / 1M
Cache Read Price $0.200 / 1M $0.500 / 1M
Cache Write Price $5.000 / 1M $6.250 / 1M
Total Input Tokens 308,056 376,421
Output Tokens 9,434 67,688
Reasoning Tokens 15,572 37,974
Response Time (avg) 25.68s 25.31s
Response Time (max) 89.16s 159.01s
Response Time (total) 590.71s 582.11s
Parameters ~5T total (~500B active) ~5T total (~500B 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.

#26 Claude Opus 5.5

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

#30 Claude Opus 5

high
Cost
$0.265
Time
144.5s
Tokens
10,741 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
Claude Opus 5 10.0 10.0 100.0% 0 12.73s 10,590 7,547 1,721

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