Model Comparison
Seed-OSS-36B-Instruct
vs. Step 3.5 Flash 2603
Comparing 2 AI models · 10 benchmarks · ByteDance Seed, StepFun
Recommended Pick
StStep 3.5 Flash 260314 metric winsStrongest on: Value, Input price, Output price
Best Value
Step 3.5 Flash 2603
100.0 value score
43.7 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Seed-OSS-36B-Instruct
53.9 reasoning score
Blends available reasoning benchmarks
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Step 3.5 Flash 2603 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 3.5 Flash 2603 is 2.1x cheaper on input tokens than Seed-OSS-36B-Instruct.
Speed gap
Step 3.5 Flash 2603 generates about 5.5x as many tokens per second as Seed-OSS-36B-Instruct.
Reasoning gap
Seed-OSS-36B-Instruct leads Step 3.5 Flash 2603 by 10.1 points on reasoning.
Top-pick rationale
Step 3.5 Flash 2603 wins 14 measurable categories, including Value, Input price, Output price, Blended price.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Seed-OSS-36B-Instruct
ByteDance Seed
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Step 3.5 Flash 2603
StepFun
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | By Seed-OSS-36B-Instruct | Top Pick St Step 3.5 Flash 2603 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.21/1M | $0.10/1M |
| Output Cost | $0.57/1M | $0.30/1M |
| Blended (3:1) | $0.30/1M | $0.15/1M |
| Specifications | ||
| Organization | ByteDance Seed | StepFun |
| Release Date | Aug 20, 2025 | Apr 2, 2026 |
| Performance & Speed | ||
| Throughput | 38.8 tok/s | 212.5 tok/s |
| TTFT | 1463ms | 751ms |
| Latency | 53060ms | 10162ms |
| Composite Indices | ||
| Value Score | 61.6 | 100.0 |
| Reasoning Score | 53.9 | 43.7 |
| Intelligence | 18.3 | 26.0 |
| Math | 84.7 | — |
| Standard Benchmarks | ||
| GPQA | 72.6% | 82.6% |
| MMLU Pro | 81.5% | — |
| HLE | 9.1% | 22.6% |
| LiveCodeBench | 76.5% | — |
| AIME 2025 | 84.7% | — |
| SciCode | 36.5% | 38.5% |
| LCR | 57.7% | 54.3% |
| IFBench | 41.9% | 66.5% |
| TAU-bench v2 | 49.4% | 87.4% |
| TerminalBench Hard | 6.8% | 32.6% |
Key Takeaways
Step 3.5 Flash 2603 offers the best value at $0.10/1M,making it ideal for high-volume applications and cost-conscious projects.
Seed-OSS-36B-Instruct has the strongest reasoning profile with a 53.9 reasoning score,combining the available reasoning-heavy benchmarks.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Seed-OSS-36B-Instruct
- Complex reasoning tasks
- Research & analysis
Step 3.5 Flash 2603
- Cost-sensitive applications
- High-volume processing
