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Claude Opus 5.5 (high) vs Seed 2.1 Turbo (low)

Claude Opus 5.5 (high) leads on average score with 9.4 vs 9.3. Seed 2.1 Turbo (low) has the lower benchmark cost at $1.645 vs $2.133. Claude Opus 5.5 (high) is faster at 27.55s vs 161.25s, with pass rates of 87.0% vs 81.2%.

Last updated at: 2026-10-26

Compared models

Rank
#28
Total Output Tokens
42,782
Response Time (avg)
27.55s
Total Cost
$2.133
Rank
#34
Total Output Tokens
609,333
Response Time (avg)
161.25s
Total Cost
$1.645
Recommended model Claude Opus 5.5 (high)

It has the best score here (9.4), while responding about 5.9x faster than Seed 2.1 Turbo (low).

Detailed comparison

Metric Claude Opus 5.5 Claude Opus 5.5 high Release: 2026-09-23 Seed 2.1 Turbo Seed 2.1 Turbo low Release: 2026-08-12
Score 9.4 9.3
Rank #28 #34
Reliability 10.0 10.0
Consistency 9.3 9.3
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 87.0% 81.2%
Flaky tests 2 2
Total Runs 69 69
Cost per result 11.222 9.135
Total Cost $2.133 $1.645
Input Price $4.000 / 1M $0.500 / 1M
Output Price $20.000 / 1M $2.500 / 1M
Cache Read Price $0.200 / 1M N/A
Cache Write Price $5.000 / 1M N/A
Total Input Tokens 319,095 241,855
Output Tokens 10,371 8,387
Reasoning Tokens 32,411 600,946
Response Time (avg) 27.55s 161.25s
Response Time (max) 95.95s 739.98s
Response Time (total) 633.73s 3708.70s
Parameters ~5T total (~500B active) ~200B total (~20B 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.

#28 Claude Opus 5.5

high
Cost
$0.136
Time
75.6s
Tokens
6,934 tok

#34 Seed 2.1 Turbo

low
Cost
$0.049
Time
298.8s
Tokens
19,730 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 13.44s 10,608 584 5,042
Seed 2.1 Turbo 10.0 10.0 100.0% 0 360.85s 8,220 385 207,368

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