# Gemini 3.5 Flash vs GPT-5.4 Pro

> Side-by-side benchmark comparison for Gemini 3.5 Flash and GPT-5.4 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-5-flash-vs-gpt-5-4-pro
- Last updated: October 2, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

GPT-5.4 Pro leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- GPT-5.4 Pro has the higher overall point estimate 70.74 to 63.95. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in mathematics, where the averages are 55.1 for Gemini 3.5 Flash and 68.8 for GPT-5.4 Pro.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 14.583% and 37.500%.
- Gemini 3.5 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.4 Pro also has the larger context window at 1.05M.

## Model Snapshot

| Property | Gemini 3.5 Flash | GPT-5.4 Pro |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Overall Score | 63.95 | 70.74 |
| Benchmarks Covered | 27 | 10 |
| Pricing (input/output) | $1.50 / $9.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 50.7 (Supported · #42/119)
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| MCP Atlas | 83.6% | Coming soon | Coming soon |
| Toolathlon | 56.5% | Coming soon | Coming soon |
| OSWorld-Verified | 78.4% | Coming soon | Coming soon |
| Finance Agent v2 | 57.9% | Coming soon | Coming soon |
| Gert Labs | 61.85% | Coming soon | Coming soon |
| ResearchClawBench | 18.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 74.2% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 89.3% | Coming soon |

### Coding

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 52.3 (Supported · #39/144)
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| SWE-bench Pro | 55.1% | Coming soon | Coming soon |
| Vibe Code Bench | 48.68% | Coming soon | Coming soon |
| cursorBench31 | 49.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 48.8% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.6% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.8% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 62.8 (#20/27)
- GPT-5.4 Pro public-lane score: 74.3 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.5 Flash | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | 77.3% | Coming soon | Coming soon |
| MRCR 1M | 26.6% | Coming soon | Coming soon |
| ARC-AGI-2 | 72.1% | 83.3% | GPT-5.4 Pro |

### Multimodal & Grounded

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 87.8 (#6/49)
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 84.2% | Coming soon | Coming soon |
| MMMU-Pro | 83.6% | Coming soon | Coming soon |
| Blueprint-Bench 2 | 33.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 64 (Supported · #30/171)
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 92.7% | Coming soon | Coming soon |
| HLE | 40.2% | 58.7% | GPT-5.4 Pro |
| GPQA Diamond (Vals) | 92.7% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.5% | Coming soon | Coming soon |
| FrontierScience | Coming soon | 36.7% | Coming soon |
| FrontierScience Research | Coming soon | 36.7% | Coming soon |
| HLE w/o tools | Coming soon | 42.7% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 84.1 (#43/125)
- GPT-5.4 Pro public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 55.1 (Unranked · 2 rankable rows)
- GPT-5.4 Pro public-lane score: 68.8 (Unranked · 4 rankable rows)

| Benchmark | Gemini 3.5 Flash | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 38.966% | 50.000% | GPT-5.4 Pro |
| FrontierMath v2 (Tier 4) | 14.583% | 37.500% | GPT-5.4 Pro |
| IPhO 2025 (Theory) | Coming soon | 93.5% | Coming soon |
| FrontierMath (legacy) | Coming soon | 50% | Coming soon |

## FAQ

### Which is better overall, Gemini 3.5 Flash or GPT-5.4 Pro?

GPT-5.4 Pro has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Gemini 3.5 Flash and GPT-5.4 Pro?

The widest category gap is in mathematics, where the averages are 55.1 for Gemini 3.5 Flash and 68.8 for GPT-5.4 Pro.

### How many benchmarks does Gemini 3.5 Flash cover on BenchLM?

Gemini 3.5 Flash currently has 27 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.4 Pro cover on BenchLM?

GPT-5.4 Pro currently has 10 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.5 Flash vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-vs-gemini-3-5-flash-cyber)
- [GPT-5.4 Pro vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-cyber-vs-gpt-5-4-pro)
- [Gemini 3.5 Flash vs GPT-5.4](/compare/gemini-3-5-flash-vs-gpt-5-4)
- [GPT-5.4 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-pro)

## Explore More

- [Gemini 3.5 Flash profile](/models/gemini-3-5-flash)
- [GPT-5.4 Pro profile](/models/gpt-5-4-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)