Model Comparison
Step 3.5 Flash
vs. Tri-21B-think Preview
Comparing 2 AI models · 0 benchmarks · StepFun, Trillion Labs
Recommended Pick
StStep 3.5 Flash2 metric winsStrongest on: Reasoning, Intelligence
Lowest Price
Step 3.5 Flash
$0.10/1M input price
Best Reasoning
Step 3.5 Flash
26.0 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Reasoning gap
Step 3.5 Flash leads Tri-21B-think Preview by 12.4 points on reasoning.
Top-pick rationale
Step 3.5 Flash wins 2 measurable categories, including Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Step 3.5 Flash
StepFun
TTFT
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Time
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tok/s
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Tokens
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Cost
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Tri-21B-think Preview
Trillion Labs
TTFT
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Time
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tok/s
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Tokens
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Cost
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Which answer was more useful?
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Full Comparison
| Metric | Top Pick St Step 3.5 Flash | Tr Tri-21B-think Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | — |
| Output Cost | $0.30/1M | — |
| Blended (3:1) | $0.15/1M | — |
| Specifications | ||
| Organization | StepFun | Trillion Labs |
| Release Date | Feb 2, 2026 | Feb 10, 2026 |
| Performance & Speed | ||
| Throughput | 221.7 tok/s | — |
| TTFT | 1070ms | — |
| Latency | 10090ms | — |
| Composite Indices | ||
| Value Score | 100.0 | — |
| Reasoning Score | 26.0 | 13.6 |
| Intelligence | 26.0 | 13.6 |
Key Takeaways
Step 3.5 Flash offers the best value at $0.10/1M,making it ideal for high-volume applications and cost-conscious projects.
Step 3.5 Flash has the strongest reasoning profile with a 26.0 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
Step 3.5 Flash
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
Tri-21B-think Preview
- General-purpose AI
- Versatile applications
