# GPT-5.6 Sol vs Pareto 26.9

> Side-by-side benchmark comparison for GPT-5.6 Sol and Pareto 26.9 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-6-sol-vs-pareto-26-9
- Last updated: September 18, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.6 Sol and Pareto 26.9 share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Pareto 26.9 has the lower published output-token price.
- GPT-5.6 Sol has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-5.6 Sol | Pareto 26.9 |
|----------|----------|----------|
| Creator | OpenAI | Unbiased |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | N/A |
| Independent public score (not head-to-head) | 80.46 | null |
| Benchmarks Covered | 37 | 4 |
| Pricing (input/output) | $4.00 / $20.00 | $2.50 / $7.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 69.8 (Supported · #6/154)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.6 Sol | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 34.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 91.9% | Coming soon | Coming soon |
| BrowseComp | 92.2% | Coming soon | Coming soon |
| OSWorld 2.0 | 62.6% | Coming soon | Coming soon |
| CyberGym | 84.5% | Coming soon | Coming soon |
| ExploitGym | 33.7% | Coming soon | Coming soon |
| Toolathlon | 58% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 85.8% | Coming soon | Coming soon |
| ApprenticeBench | 26% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 51.00% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 74.3 (Supported · #5/154)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.6 Sol | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 42 fixes | Coming soon | Coming soon |
| SWE-bench Pro | 64.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 91.9% | Coming soon | Coming soon |
| DeepSWE | 72.7% | 74.0% | Pareto 26.9 |
| FrontierCode 1.1 Extended | 60.6% | Coming soon | Coming soon |
| FrontierSWE v2 | 32.2% | Coming soon | Coming soon |
| cursorBench32 | 67.2% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| VulcanBench CII v1 | 86.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 82.6% | Coming soon | Coming soon |
| SWE-bench (Vals) | 96.2% | Coming soon | Coming soon |
| cursorBench40 | 41.7% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 87.6 (#4/48)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.6 Sol | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 83% | 78% | GPT-5.6 Sol |
| MMMU-Pro w/ Python | 84.6% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 70.4 (#12/20)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.6 Sol | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 92.5% | Coming soon | Coming soon |
| ARC-AGI-3 | 7.8% | Coming soon | Coming soon |
| GeneBench-Pro | 28.7% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 80.5 (Supported · #5/184)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.6 Sol | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 94.6% | Coming soon | Coming soon |
| GPQA-D | 94.6% | Coming soon | Coming soon |
| HLE-Verified | 54.5% | Coming soon | Coming soon |
| LABBench2 | 82.1% | Coming soon | Coming soon |
| HealthBench Professional | 60.5% | Coming soon | Coming soon |
| HealthBench Hard | 33.1% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 95.2% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.1% | Coming soon | Coming soon |
| HLE w/o tools | Coming soon | 49% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 87.7 (#28/124)
- Pareto 26.9 public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.6 Sol public-lane score: 96.8 (Unranked · 3 rankable rows)
- Pareto 26.9 public-lane score: Coming soon

| Benchmark | GPT-5.6 Sol | Pareto 26.9 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 89% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 89.000% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 83.000% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-5.6 Sol and Pareto 26.9?

Not yet. The models share only 2 sourced benchmark rows, 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-5.6 Sol vs GPT-5.6 Terra](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)
- [Pareto 26.9 vs GPT-5.6 Terra](/compare/gpt-5-6-terra-vs-pareto-26-9)
- [GPT-5.6 Sol vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-sol)
- [Pareto 26.9 vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-pareto-26-9)

## Explore More

- [GPT-5.6 Sol profile](/models/gpt-5-6-sol)
- [Pareto 26.9 profile](/models/pareto-26-9)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)