Model Comparison
Solar Pro 4
vs. Step 3.7 Flash
Comparing 2 AI models · 7 benchmarks · Upstage, StepFun
Recommended Pick
UpSolar Pro 48 metric winsStrongest on: Value, Reasoning, Intelligence
Best Value
Solar Pro 4
100.0 value score
53.3 reasoning / $0.52/1M
Lowest Price
Step 3.7 Flash
$0.20/1M input price
Best Reasoning
Solar Pro 4
53.3 reasoning score
Blends available reasoning benchmarks
Best for Coding
Solar Pro 4
52.7 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Solar Pro 4 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 3.7 Flash is 1.5x cheaper on input tokens than Solar Pro 4.
Speed gap
Step 3.7 Flash generates about 5.8x as many tokens per second as Solar Pro 4.
Reasoning gap
Solar Pro 4 leads Step 3.7 Flash by 8.9 points on reasoning.
Coding gap
Solar Pro 4 leads Step 3.7 Flash by 13.1 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Solar Pro 4
Upstage
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
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Step 3.7 Flash
StepFun
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | Top Pick Up Solar Pro 4 | St Step 3.7 Flash |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.30/1M | $0.20/1M |
| Output Cost | $1.20/1M | $1.15/1M |
| Blended (3:1) | $0.52/1M | $0.44/1M |
| Specifications | ||
| Organization | Upstage | StepFun |
| Release Date | Aug 6, 2026 | May 29, 2026 |
| Performance & Speed | ||
| Throughput | 66.3 tok/s | 383.5 tok/s |
| TTFT | 1239ms | 717ms |
| Latency | 31422ms | 5932ms |
| Composite Indices | ||
| Value Score | 100.0 | 100.0 |
| Reasoning Score | 53.3 | 44.4 |
| Intelligence | 41.6 | 30.9 |
| Coding | 52.7 | 39.6 |
| Standard Benchmarks | ||
| GPQA | 89.1% | 80.9% |
| HLE | 29.2% | 21.4% |
| SciCode | 43.6% | 40.0% |
| LCR | 70.7% | 69.7% |
| IFBench | — | 67.3% |
| TAU-bench v2 | — | 98.5% |
| TerminalBench Hard | — | 35.6% |
Key Takeaways
Step 3.7 Flash offers the best value at $0.20/1M,making it ideal for high-volume applications and cost-conscious projects.
Solar Pro 4 has the strongest reasoning profile with a 53.3 reasoning score,combining the available reasoning-heavy benchmarks.
Solar Pro 4 reaches a 52.7 coding index,making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Solar Pro 4
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
Step 3.7 Flash
- Cost-sensitive applications
- High-volume processing
