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

Claude Opus 5.5 (low) leads on average score with 9.4 vs 9.3. Seed 2.1 Turbo (low) has the lower benchmark cost at $1.645 vs $1.733. Claude Opus 5.5 (low) is faster at 25.68s vs 161.25s, with pass rates of 88.4% vs 81.2%.

Last updated at: 2026-10-19

Compared models

Rank
#24
Total Output Tokens
25,006
Response Time (avg)
25.68s
Total Cost
$1.733
Rank
#29
Total Output Tokens
609,333
Response Time (avg)
161.25s
Total Cost
$1.645
Recommended model Claude Opus 5.5 (low)

It has the best score here (9.4), while responding about 6.3x faster than Seed 2.1 Turbo (low).

Detailed comparison

Metric Claude Opus 5.5 Claude Opus 5.5 low Release: 2026-09-23 Seed 2.1 Turbo Seed 2.1 Turbo low Release: 2026-08-12
Score 9.4 9.3
Rank #24 #29
Reliability 10.0 10.0
Consistency 9.3 9.3
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 88.4% 81.2%
Flaky tests 2 2
Total Runs 69 69
Cost per result 9.118 9.135
Total Cost $1.733 $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 308,056 241,855
Output Tokens 9,434 8,387
Reasoning Tokens 15,572 600,946
Response Time (avg) 25.68s 161.25s
Response Time (max) 89.16s 739.98s
Response Time (total) 590.71s 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.

#24 Claude Opus 5.5

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

#29 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 12.23s 10,608 575 2,777
Seed 2.1 Turbo 10.0 10.0 100.0% 0 360.85s 8,220 385 207,368

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