Model Comparison
Solar Open 100B (Reasoning)
vs. Solar Open2 250B
Comparing 2 AI models · 7 benchmarks · Upstage
Recommended Pick
UpSolar Open2 250B6 metric winsStrongest on: Reasoning, Intelligence, GPQA
Lowest Price
Solar Open 100B (Reasoning)
$0.00/1M input price
Best Reasoning
Solar Open2 250B
50.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
Solar Open2 250B
44.7 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Reasoning gap
Solar Open2 250B leads Solar Open 100B (Reasoning) by 20.1 points on reasoning.
Top-pick rationale
Solar Open2 250B wins 6 measurable categories, including Reasoning, Intelligence, GPQA, HLE.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Solar Open 100B (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 Open2 250B
Upstage
TTFT
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Time
—
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 Open 100B (Reasoning) | Top Pick Up Solar Open2 250B |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.00/1M | $0.00/1M |
| Output Cost | $0.00/1M | $0.00/1M |
| Specifications | ||
| Organization | Upstage | Upstage |
| Release Date | Dec 17, 2025 | Aug 12, 2026 |
| Performance & Speed | ||
| Throughput | — | — |
| TTFT | — | — |
| Latency | — | — |
| Composite Indices | ||
| Reasoning Score | 30.4 | 50.5 |
| Intelligence | 15.2 | 37.4 |
| Coding | — | 44.7 |
| Standard Benchmarks | ||
| GPQA | 65.7% | 85.7% |
| HLE | 10.4% | 28.5% |
| SciCode | 26.9% | 45.6% |
| LCR | 37.0% | 68.3% |
| IFBench | 57.7% | — |
| TAU-bench v2 | 48.2% | — |
| TerminalBench Hard | 2.3% | — |
Key Takeaways
Solar Open 100B (Reasoning) offers the best value at $0.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Solar Open2 250B has the strongest reasoning profile with a 50.5 reasoning score,combining the available reasoning-heavy benchmarks.
Solar Open2 250B reaches a 44.7 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 Open 100B (Reasoning)
- Cost-sensitive applications
- High-volume processing
Solar Open2 250B
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
