GPT-5.6 Sol vs Solar Pro 4
GPT-5.6 Sol (OpenAI) and Solar Pro 4 (Upstage) compared on benchmarks, pricing, context window, and use-case rankings.
- Solar Pro 4 is cheaper on input tokens — $0.03 vs $5.00 per 1M.
- GPT-5.6 Sol has a larger context window (1.1M vs 524K tokens).
- GPT-5.6 Sol ranks higher for coding (94th vs 50th percentile).
| Attribute | GPT-5.6 Sol | Solar Pro 4 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 161 | — |
| Coding | 94 | 50 |
| Math | 97 | — |
| Reasoning & Knowledge | 94 | 59 |
| Agentic & Tools | 64 | — |
| Specifications | ||
| Developer | OpenAI | Upstage |
| Family | GPT | — |
| Released | Jul 9, 2026 | Aug 10, 2026 |
| Parameters | — | — |
| Availability | API access | — |
| Context window | 1.1M | 524K |
| Price — $/M input | $5.00 | $0.03 |
| Price — $/M output | $30.00 | $0.12 |
| Inputs | file, image, text | text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | — |
| APEX | 40% | — |
| ARC-AGI | 98% | — |
| ARC-AGI-2 | 93% | — |
| GPQA Diamond | 93% | 89% |
| Humanity's Last Exam | 50% | 29% |
| SciCode | 56% | 44% |
| SimpleBench | 72% | — |
| SimpleQA Verified | 72% | — |
| WebDev Arena | 1620 | — |
| WeirdML | 89% | — |
| τ²-bench | 85% | — |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, GPT-5.6 Sol or Solar Pro 4?
Solar Pro 4 is cheaper on input tokens at $0.03 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, GPT-5.6 Sol or Solar Pro 4?
GPT-5.6 Sol supports up to 1.1M tokens, compared with 524K for the other.
Which is better for coding, GPT-5.6 Sol or Solar Pro 4?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, GPT-5.6 Sol ranks higher — 94th vs 50th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.