# GPT-4o vs GPT-5.6 Sol

> Side-by-side benchmark comparison for GPT-4o and GPT-5.6 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-4o-vs-gpt-5-6-sol
- Last updated: September 24, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-4o and GPT-5.6 Sol 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.
- GPT-4o has the lower published output-token price.
- GPT-5.6 Sol has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-4o | GPT-5.6 Sol |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 128K | 1.05M |
| Independent public score (not head-to-head) | 30.77 | 78.49 |
| Benchmarks Covered | 1 | 37 |
| Pricing (input/output) | $2.50 / $10.00 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: 69.6 (Supported · #7/105)

| Benchmark | GPT-4o | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | Coming soon | 34.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 91.9% | Coming soon |
| BrowseComp | Coming soon | 92.2% | Coming soon |
| OSWorld 2.0 | Coming soon | 62.6% | Coming soon |
| CyberGym | Coming soon | 84.5% | Coming soon |
| ExploitGym | Coming soon | 33.7% | Coming soon |
| Toolathlon | Coming soon | 58% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 85.8% | Coming soon |
| ApprenticeBench | Coming soon | 26% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: 71.6 (Supported · #6/135)

| Benchmark | GPT-4o | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | Coming soon | 42 fixes | Coming soon |
| SWE-bench Pro | Coming soon | 64.6% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 91.9% | Coming soon |
| DeepSWE | Coming soon | 72.7% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 60.6% | Coming soon |
| FrontierSWE v2 | Coming soon | 32.2% | Coming soon |
| cursorBench32 | Coming soon | 67.2% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| VulcanBench CII v1 | Coming soon | 86.5% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 82.6% | Coming soon |
| SWE-bench (Vals) | Coming soon | 96.2% | Coming soon |
| cursorBench40 | Coming soon | 41.7% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 56 (Unranked · 2 rankable rows)
- GPT-5.6 Sol public-lane score: 72.1 (#8/19)

| Benchmark | GPT-4o | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 92.5% | Coming soon |
| ARC-AGI-3 | Coming soon | 7.8% | Coming soon |
| GeneBench-Pro | Coming soon | 28.7% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: 87.6 (#5/50)

| Benchmark | GPT-4o | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 83% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 84.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 31.5 (Estimated · #123/158)
- GPT-5.6 Sol public-lane score: 78.8 (Supported · #7/158)

| Benchmark | GPT-4o | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 94.6% | Coming soon |
| GPQA-D | Coming soon | 94.6% | Coming soon |
| HLE-Verified | Coming soon | 54.5% | Coming soon |
| LABBench2 | Coming soon | 82.1% | Coming soon |
| HealthBench Professional | Coming soon | 60.5% | Coming soon |
| HealthBench Hard | Coming soon | 33.1% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 95.2% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 89.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 37.6 (#106/124)
- GPT-5.6 Sol public-lane score: 87.7 (#28/124)

### Mathematics

- Winner: Insufficient shared evidence
- GPT-4o public-lane score: 25.1 (Unranked · 1 rankable row)
- GPT-5.6 Sol public-lane score: 96.8 (Unranked · 3 rankable rows)

| Benchmark | GPT-4o | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 0.345% | 89.000% | GPT-5.6 Sol |
| FrontierMath (legacy) | Coming soon | 89% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 83.000% | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-4o and GPT-5.6 Sol?

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-4o vs GPT-4o mini](/compare/gpt-4o-vs-gpt-4o-mini)
- [GPT-5.6 Sol vs GPT-4o mini](/compare/gpt-4o-mini-vs-gpt-5-6-sol)
- [GPT-4o vs GPT-5.6 Terra](/compare/gpt-4o-vs-gpt-5-6-terra)
- [GPT-5.6 Sol vs GPT-5.6 Terra](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)

## Explore More

- [GPT-4o profile](/models/gpt-4o)
- [GPT-5.6 Sol profile](/models/gpt-5-6-sol)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)