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ByteDance Seed: Seed-2.0-Lite vs StepFun: Step 3.5 Flash

Summary

Seed-2.0-Lite vs Step 3.5 Flash benchmark comparison: Step 3.5 Flash leads on average score with 6.6 vs 6.2. Seed-2.0-Lite has the lower benchmark cost at $0.019 vs $0.070. Seed-2.0-Lite is faster at 2.49s vs 72.53s, with pass rates of 46.0% vs 54.0%.

Recommended model: Seed-2.0-Lite - Its score stays close to the best score here (6.2 vs 6.6), while costing about 3.8x less than Step 3.5 Flash.

Last updated at: 2026-06-18

Metric Seed-2.0-Lite Seed-2.0-Lite none Release: 2026-02-14 Step 3.5 Flash Step 3.5 Flash medium Release: 2026-02-01
Score 6.2 6.6
Rank #92 #80
Reliability 10.0 10.0
Consistency 8.4 8.9
Tests Correct
Attempt pass rate 46.0% 54.0%
Flaky tests 4 1
Total Runs 63 60
Cost per result 0.228 0.198
Total Cost $0.019 $0.070
Input Price $0.250 / 1M $0.090 / 1M
Output Price $2.000 / 1M $0.300 / 1M
Total Input Tokens 46,573 34,431
Output Tokens 3,259 91,587
Reasoning Tokens 0 195,973
Response Time (avg) 2.49s 72.53s
Response Time (max) 6.70s 453.94s
Response Time (total) 52.26s 1015.47s

Generation showcase

Hamster playing table tennis

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

#92 Seed-2.0-Lite

none
Cost
$0.005
Time
83.8s
Tokens
2,311 tok

#80 Step 3.5 Flash

medium
Cost
$0.008
Time
277.1s
Tokens
23,695 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

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 3.0 5.9 16.7% 2 2.43s 894 709 0
Step 3.5 Flash 10.0 10.0 100.0% 0 40.57s 694 20,391 24,176
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 5.6 10.0 33.3% 0 2.83s 8,215 410 0
Step 3.5 Flash 2.4 5.2 0.0% 0 258.38s 2,211 13,207 22,429
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 3.0 10.0 0.0% 0 6.59s 16,215 498 0
Step 3.5 Flash 10.0 10.0 100.0% 0 29.57s 13,638 1,176 12,984
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 10.0 10.0 100.0% 0 1.82s 8,538 246 0
Step 3.5 Flash 10.0 10.0 100.0% 0 15.01s 7,368 600 13,886
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 3.6 7.2 22.2% 1 1.33s 939 17 0
Step 3.5 Flash 5.3 7.2 44.4% 1 170.45s 673 45,350 90,436
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 10.0 10.0 100.0% 0 3.45s 570 294 0
Step 3.5 Flash 5.5 10.0 0.0% 0 22.39s 509 240 3,506
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 10.0 10.0 100.0% 0 1.06s 810 73 0
Step 3.5 Flash 8.3 10.0 50.0% 0 4.78s 705 2,364 3,521
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 5.3 7.2 44.4% 1 2.78s 858 709 0
Step 3.5 Flash 5.3 10.0 33.3% 0 7.22s 711 5,630 10,861
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 10.0 10.0 100.0% 0 3.94s 9,270 292 0
Step 3.5 Flash 10.0 10.0 100.0% 0 11.91s 7,701 275 3,802
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Seed-2.0-Lite 3.0 10.0 0.0% 0 1.96s 264 11 0
Step 3.5 Flash 3.0 10.0 0.0% 0 108.45s 221 2,354 10,372

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