Model Comparison
Solar Pro 2 (Reasoning)
vs. Solar Pro 4
Comparing 2 AI models · 12 benchmarks · Upstage
Recommended Pick
UpSolar Pro 46 metric winsStrongest on: Throughput, Intelligence, GPQA
Lowest Price
Solar Pro 2 (Reasoning)
$0.00/1M input price
Best Reasoning
Solar Pro 2 (Reasoning)
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
Price gap
Solar Pro 2 (Reasoning) is ∞x cheaper on input tokens than Solar Pro 4.
Reasoning gap
Solar Pro 2 (Reasoning) leads Solar Pro 4 by 0.0 points on reasoning.
Top-pick rationale
Solar Pro 4 wins 6 measurable categories, including Throughput, Intelligence, GPQA, HLE.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Solar Pro 2 (Reasoning)
Upstage
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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Solar Pro 4
Upstage
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 | Up Solar Pro 2 (Reasoning) | Top Pick Up Solar Pro 4 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $0.30/1M |
| Output Cost | $0.00/1M | $1.20/1M |
| Blended (3:1) | — | $0.52/1M |
| Specifications | ||
| Organization | Upstage | Upstage |
| Release Date | Jul 9, 2025 | Aug 6, 2026 |
| Performance & Speed | ||
| Throughput | — | 66.3 tok/s |
| TTFT | — | 1239ms |
| Latency | — | 31422ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 53.3 | 53.3 |
| Intelligence | 8.8 | 41.6 |
| Coding | — | 52.7 |
| Math | 61.3 | — |
| Standard Benchmarks | ||
| GPQA | 68.7% | 89.1% |
| MMLU Pro | 80.5% | — |
| HLE | 7.4% | 29.2% |
| LiveCodeBench | 61.6% | — |
| MATH 500 | 96.7% | — |
| AIME 2025 | 61.3% | — |
| AIME (Original) | 69.0% | — |
| SciCode | 30.2% | 43.6% |
| LCR | 0.0% | 70.7% |
| IFBench | 37.1% | — |
| TAU-bench v2 | 28.1% | — |
| TerminalBench Hard | 3.0% | — |
Key Takeaways
Solar Pro 2 (Reasoning) offers the best value at $0.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Solar Pro 2 (Reasoning) 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 2 (Reasoning)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
Solar Pro 4
- Code generation
- Software development
