# Gemini 3.5 Flash Cyber vs GPT-5.6 Luna

> Side-by-side benchmark comparison for Gemini 3.5 Flash Cyber and GPT-5.6 Luna across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-5-flash-cyber-vs-gpt-5-6-luna
- Last updated: September 4, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 3.5 Flash Cyber and GPT-5.6 Luna 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.
- Gemini 3.5 Flash Cyber has the lower published output-token price.
- GPT-5.6 Luna has the larger published context window at 1.05M.

## Model Snapshot

| Property | Gemini 3.5 Flash Cyber | GPT-5.6 Luna |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | null | 1.05M |
| Independent public score (not head-to-head) | null | 65.54 |
| Benchmarks Covered | 1 | 28 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | $1.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash Cyber public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 56.5 (Supported · #34/151)

| Benchmark | Gemini 3.5 Flash Cyber | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| CyberGym | 83.2% | 77.9% | Gemini 3.5 Flash Cyber |
| Terminal-Bench 3.0 | Coming soon | 14.3% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 84.7% | Coming soon |
| BrowseComp | Coming soon | 83.3% | Coming soon |
| OSWorld 2.0 | Coming soon | 45.6% | Coming soon |
| ExploitGym | Coming soon | 12.4% | Coming soon |
| Toolathlon | Coming soon | 53.4% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 79.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash Cyber public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 66.9 (Supported · #10/183)

| Benchmark | Gemini 3.5 Flash Cyber | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | Coming soon | 62.7% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 84.7% | Coming soon |
| deepSwe | Coming soon | 67.2% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 55.1% | Coming soon |
| cursorBench32 | Coming soon | 61.1% | Coming soon |
| VulcanBench v3 | Coming soon | 85.5% | Coming soon |
| SWE-bench (Vals) | Coming soon | 93.0% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash Cyber public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 67 (#21/48)

| Benchmark | Gemini 3.5 Flash Cyber | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 78.4% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 79.5% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash Cyber public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 50.4 (#21/22)

| Benchmark | Gemini 3.5 Flash Cyber | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 59.5% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.2% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash Cyber public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 64.7 (Supported · #27/181)

| Benchmark | Gemini 3.5 Flash Cyber | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 92.3% | Coming soon |
| GPQA-D | Coming soon | 92.3% | Coming soon |
| HealthBench Professional | Coming soon | 55.7% | Coming soon |
| HealthBench Hard | Coming soon | 32.0% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 91.7% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 86.0% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3.5 Flash Cyber public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 94.4 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3.5 Flash Cyber | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 78.6% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 78.600% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 58.500% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 3.5 Flash Cyber and GPT-5.6 Luna?

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

- [Gemini 3.5 Flash Cyber vs Gemini 3.5 Flash](/compare/gemini-3-5-flash-vs-gemini-3-5-flash-cyber)
- [GPT-5.6 Luna vs Gemini 3.5 Flash](/compare/gemini-3-5-flash-vs-gpt-5-6-luna)
- [Gemini 3.5 Flash Cyber vs GPT-5.6 Sol](/compare/gemini-3-5-flash-cyber-vs-gpt-5-6-sol)
- [GPT-5.6 Luna vs GPT-5.6 Sol](/compare/gpt-5-6-luna-vs-gpt-5-6-sol)

## Explore More

- [Gemini 3.5 Flash Cyber profile](/models/gemini-3-5-flash-cyber)
- [GPT-5.6 Luna profile](/models/gpt-5-6-luna)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)