# Gemini 3.8 Flash vs GPT-5.6 Sol

> Side-by-side benchmark comparison for Gemini 3.8 Flash and GPT-5.6 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-8-flash-vs-gpt-5-6-sol
- Last updated: October 17, 2026

- Shared sourced benchmarks: 23
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-5.6 Sol if you want the stronger benchmark profile. Gemini 3.8 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.6 Sol leads overall 75.32 to 69.25.
- The clearest category separation is in mathematics, where the averages are 69.7 for Gemini 3.8 Flash and 95.8 for GPT-5.6 Sol.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 21.951% and 83.000%.
- Gemini 3.8 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Sol also has the larger context window at 1.05M.

## Model Snapshot

| Property | Gemini 3.8 Flash | GPT-5.6 Sol |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 69.25 | 75.32 |
| Benchmarks Covered | 31 | 41 |
| Pricing (input/output) | $0.75 / $3.75 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: GPT-5.6 Sol
- Gemini 3.8 Flash public-lane score: 65.9 (Supported · #16/128)
- GPT-5.6 Sol public-lane score: 68.7 (Supported · #12/128)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Finance Agent v2 | 61.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 89.4% | 91.9% | GPT-5.6 Sol |
| Terminal-Bench 4.0 | 19.10% | Coming soon | Coming soon |
| OSWorld 2.0 | 59.0% | 62.6% | GPT-5.6 Sol |
| Terminal-Bench 2.1 (Vals) | 81.3% | 85.8% | GPT-5.6 Sol |
| ApprenticeBench | 24% | 26% | GPT-5.6 Sol |
| Hermes Index | 38.1% | Coming soon | Coming soon |
| Hermes Bench | 62.2% | Coming soon | Coming soon |
| MazeBench | 4% | 13% | GPT-5.6 Sol |
| Terminal-Bench 3.0 | Coming soon | 34.6% | Coming soon |
| BrowseComp | Coming soon | 92.2% | Coming soon |
| CyberGym | Coming soon | 84.5% | Coming soon |
| ExploitGym | Coming soon | 33.7% | Coming soon |
| Toolathlon | Coming soon | 58% | Coming soon |

### Coding

- Winner: GPT-5.6 Sol
- Gemini 3.8 Flash public-lane score: 61 (Supported · #17/150)
- GPT-5.6 Sol public-lane score: 67.4 (Supported · #11/150)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 73.8% | 72.7% | Gemini 3.8 Flash |
| Terminal-Bench 2.1 | 89.4% | 91.9% | GPT-5.6 Sol |
| CursorBench 3.2 | 69.2% | 67.2% | Gemini 3.8 Flash |
| LiveCodeBench (Vals) | 89.5% | 82.6% | Gemini 3.8 Flash |
| SWE-bench (Vals) | 80.0% | 96.2% | GPT-5.6 Sol |
| FrontierSWE v2 | 19.6% | 32.2% | GPT-5.6 Sol |
| CursorBench 4.0 | 39.6% | 41.7% | GPT-5.6 Sol |
| Bug Hunt Bench | 18.0 fixes | 42.0 fixes | GPT-5.6 Sol |
| SWE-bench Pro | Coming soon | 64.6% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 60.6% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| VulcanBench CII v1 | Coming soon | 86.5% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 36.2% | Coming soon |

### Reasoning

- Winner: GPT-5.6 Sol
- Gemini 3.8 Flash public-lane score: 74.3 (#17/28)
- GPT-5.6 Sol public-lane score: 76.5 (#16/28)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | 96.50% | Gemini 3.8 Flash |
| ARC-AGI-2 | 89.2% | 92.5% | GPT-5.6 Sol |
| ARC-AGI-3 | 10.4% | 7.8% | Gemini 3.8 Flash |
| GeneBench-Pro | Coming soon | 28.7% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemini 3.8 Flash public-lane score: 87.3 (#9/54)
- GPT-5.6 Sol public-lane score: 89.8 (#6/54)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| CharXiv w/o tools | 86.2% | Coming soon | Coming soon |
| LVBench | 87.1% | Coming soon | Coming soon |
| MMMU-Pro | Coming soon | 83% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 84.6% | Coming soon |

### Knowledge

- Winner: GPT-5.6 Sol
- Gemini 3.8 Flash public-lane score: 73.5 (Supported · #13/184)
- GPT-5.6 Sol public-lane score: 77.4 (Supported · #11/184)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| HLE-Verified | 54.9% | 54.5% | Gemini 3.8 Flash |
| LABBench2 | 86.2% | 82.1% | Gemini 3.8 Flash |
| BioMysteryBench (human-solvable) | 88.8% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 56.5% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 94.4% | 95.2% | GPT-5.6 Sol |
| MMLU-Pro (Vals) | 90.2% | 89.1% | Gemini 3.8 Flash |
| GPQA | Coming soon | 94.6% | Coming soon |
| GPQA-D | Coming soon | 94.6% | Coming soon |
| HealthBench Professional | Coming soon | 60.5% | Coming soon |
| HealthBench Hard | Coming soon | 33.1% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Gemini 3.8 Flash public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: 89.1 (#31/148)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 5.5% | 27.0% | Gemini 3.8 Flash |

### Mathematics

- Winner: Not comparable
- Gemini 3.8 Flash public-lane score: 69.7 (Unranked · 2 rankable rows)
- GPT-5.6 Sol public-lane score: 95.8 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 68.421% | 89.000% | GPT-5.6 Sol |
| FrontierMath v2 (Tier 4) | 21.951% | 83.000% | GPT-5.6 Sol |
| FrontierMath (legacy) | Coming soon | 89% | Coming soon |

## FAQ

### Which is better overall, Gemini 3.8 Flash or GPT-5.6 Sol?

GPT-5.6 Sol is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.8 Flash and GPT-5.6 Sol?

The widest category gap is in mathematics, where the averages are 69.7 for Gemini 3.8 Flash and 95.8 for GPT-5.6 Sol.

### How many benchmarks does Gemini 3.8 Flash cover on BenchLM?

Gemini 3.8 Flash currently has 31 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.6 Sol cover on BenchLM?

GPT-5.6 Sol currently has 41 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.8 Flash vs Gemini 3.8 Flash Cyber](/compare/gemini-3-8-flash-vs-gemini-3-8-flash-cyber)
- [GPT-5.6 Sol vs Gemini 3.8 Flash Cyber](/compare/gemini-3-8-flash-cyber-vs-gpt-5-6-sol)
- [Gemini 3.8 Flash vs GPT-5.6 Terra](/compare/gemini-3-8-flash-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

- [Gemini 3.8 Flash profile](/models/gemini-3-8-flash)
- [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)