# GPT-5.5 Pro vs Solar Pro 4

> Side-by-side benchmark comparison for GPT-5.5 Pro and Solar Pro 4 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-pro-vs-solar-pro-4
- Last updated: September 10, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.5 Pro and Solar Pro 4 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Solar Pro 4 has the lower published output-token price.
- GPT-5.5 Pro has the larger published context window at 1M.

## Model Snapshot

| Property | GPT-5.5 Pro | Solar Pro 4 |
|----------|----------|----------|
| Creator | OpenAI | Upstage |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 512K |
| Independent public score (not head-to-head) | 61.32 | null |
| Benchmarks Covered | 6 | 10 |
| Pricing (input/output) | $30.00 / $180.00 | $0.30 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: 58.4 (Estimated · #29/152)
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | GPT-5.5 Pro | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 90.1% | 49.2% | GPT-5.5 Pro |
| Terminal-Bench 2.1 | Coming soon | 57.0% | Coming soon |
| MCP Atlas | Coming soon | 61.4% | Coming soon |
| APEX-Agents | Coming soon | 18.7% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | GPT-5.5 Pro | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | Coming soon | 57.0% | Coming soon |
| SWE-bench Verified | Coming soon | 70.6% | Coming soon |
| LiveCodeBench | Coming soon | 87.8% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: 58.9 (Estimated · #39/183)
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | GPT-5.5 Pro | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.2% | Coming soon | Coming soon |
| HLE w/o tools | 43.1% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 89.0% | Coming soon |
| MMLU-Pro | Coming soon | 86.3% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | GPT-5.5 Pro | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 52.4% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.000% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 39.600% | Coming soon | Coming soon |
| AIME26 | Coming soon | 95.3% | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-5.5 Pro and Solar Pro 4?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [GPT-5.5 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Solar Pro 4 vs GPT-5.5](/compare/gpt-5-5-vs-solar-pro-4)
- [GPT-5.5 Pro vs Solar Pro 2](/compare/gpt-5-5-pro-vs-solar-pro-2)
- [Solar Pro 4 vs Solar Pro 2](/compare/solar-pro-2-vs-solar-pro-4)

## Explore More

- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Solar Pro 4 profile](/models/solar-pro-4)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)