Model Comparison
Step 3.5 Flash
vs. Llama 3.1 Tulu3 405B
Comparing 2 AI models · 0 benchmarks · StepFun, Allen Institute for AI
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 Llama 3.1 Tulu3 405B by 17.9 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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Cost
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Llama 3.1 Tulu3 405B
Allen Institute for AI
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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Full Comparison
| Metric | Top Pick St Step 3.5 Flash | Al Llama 3.1 Tulu3 405B |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | — |
| Output Cost | $0.30/1M | — |
| Blended (3:1) | $0.15/1M | — |
| Specifications | ||
| Organization | StepFun | Allen Institute for AI |
| Release Date | Feb 2, 2026 | Jan 30, 2025 |
| Performance & Speed | ||
| Throughput | 221.7 tok/s | — |
| TTFT | 1070ms | — |
| Latency | 10090ms | — |
| Composite Indices | ||
| Value Score | 100.0 | — |
| Reasoning Score | 26.0 | 8.1 |
| Intelligence | 26.0 | 8.1 |
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
Llama 3.1 Tulu3 405B
- General-purpose AI
- Versatile applications
