# Gemini 3.5 Flash vs Gemini 3.8 Flash

> Side-by-side benchmark comparison for Gemini 3.5 Flash and Gemini 3.8 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 14
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Gemini 3.8 Flash if you want the stronger benchmark profile. Gemini 3.5 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Gemini 3.8 Flash leads overall 69.25 to 61.88.
- The clearest category separation is in agentic, where the averages are 51.3 for Gemini 3.5 Flash and 65.9 for Gemini 3.8 Flash.
- The biggest single benchmark swing is CursorBench 3.2 in Coding, with scores of 48.8% and 69.2%.
- Gemini 3.8 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Gemini 3.5 Flash | Gemini 3.8 Flash |
|----------|----------|----------|
| Creator | Google | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 61.88 | 69.25 |
| Benchmarks Covered | 29 | 31 |
| Pricing (input/output) | $1.50 / $9.00 | $0.75 / $3.75 |

## Category Breakdown

### Agentic

- Winner: Gemini 3.8 Flash
- Gemini 3.5 Flash public-lane score: 51.3 (Supported · #45/128)
- Gemini 3.8 Flash public-lane score: 65.9 (Supported · #16/128)

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | 89.4% | Gemini 3.8 Flash |
| 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% | 61.4% | Gemini 3.8 Flash |
| Gert Labs | 61.85% | Coming soon | Coming soon |
| ResearchClawBench | 18.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 74.2% | 81.3% | Gemini 3.8 Flash |
| MazeBench | 0% | 4% | Gemini 3.8 Flash |
| Terminal-Bench 4.0 | Coming soon | 19.10% | Coming soon |
| OSWorld 2.0 | Coming soon | 59.0% | Coming soon |
| ApprenticeBench | Coming soon | 24% | Coming soon |
| Hermes Index | Coming soon | 38.1% | Coming soon |
| Hermes Bench | Coming soon | 62.2% | Coming soon |

### Coding

- Winner: Gemini 3.8 Flash
- Gemini 3.5 Flash public-lane score: 50.1 (Supported · #43/150)
- Gemini 3.8 Flash public-lane score: 61 (Supported · #17/150)

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | 89.4% | Gemini 3.8 Flash |
| 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% | 69.2% | Gemini 3.8 Flash |
| LiveCodeBench (Vals) | 87.6% | 89.5% | Gemini 3.8 Flash |
| SWE-bench (Vals) | 78.8% | 80.0% | Gemini 3.8 Flash |
| DeepSWE | Coming soon | 73.8% | Coming soon |
| FrontierSWE v2 | Coming soon | 19.6% | Coming soon |
| CursorBench 4.0 | Coming soon | 39.6% | Coming soon |
| Bug Hunt Bench | Coming soon | 18.0 fixes | Coming soon |

### Reasoning

- Winner: Directional only
- Gemini 3.5 Flash public-lane score: 70.9 (#19/28)
- Gemini 3.8 Flash public-lane score: 74.3 (#17/28)

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | 77.3% | Coming soon | Coming soon |
| MRCR 1M | 26.6% | Coming soon | Coming soon |
| ARC-AGI-2 | 72.1% | 89.2% | Gemini 3.8 Flash |
| ARC-AGI-1 | 92.50% | 98.50% | Gemini 3.8 Flash |
| ARC-AGI-3 | Coming soon | 10.4% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemini 3.5 Flash public-lane score: 87.8 (#7/54)
- Gemini 3.8 Flash public-lane score: 87.3 (#9/54)

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | 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 |
| CharXiv w/o tools | Coming soon | 86.2% | Coming soon |
| LVBench | Coming soon | 87.1% | Coming soon |

### Knowledge

- Winner: Gemini 3.8 Flash
- Gemini 3.5 Flash public-lane score: 65.6 (Supported · #32/184)
- Gemini 3.8 Flash public-lane score: 73.5 (Supported · #13/184)

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 92.7% | Coming soon | Coming soon |
| HLE | 40.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.7% | 94.4% | Gemini 3.8 Flash |
| MMLU-Pro (Vals) | 89.5% | 90.2% | Gemini 3.8 Flash |
| HLE-Verified | Coming soon | 54.9% | Coming soon |
| LABBench2 | Coming soon | 86.2% | Coming soon |
| BioMysteryBench (human-solvable) | Coming soon | 88.8% | Coming soon |
| BioMysteryBench (human-difficult) | Coming soon | 56.5% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 87.4 (#37/148)
- Gemini 3.8 Flash public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 5.5% | Coming soon |

### Mathematics

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 67.1 (Unranked · 2 rankable rows)
- Gemini 3.8 Flash public-lane score: 69.7 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.5 Flash | Gemini 3.8 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 62.807% | 68.421% | Gemini 3.8 Flash |
| FrontierMath v2 (Tier 4) | 26.829% | 21.951% | Gemini 3.5 Flash |

## FAQ

### Which is better overall, Gemini 3.5 Flash or Gemini 3.8 Flash?

Gemini 3.8 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.5 Flash and Gemini 3.8 Flash?

The widest category gap is in agentic, where the averages are 51.3 for Gemini 3.5 Flash and 65.9 for Gemini 3.8 Flash.

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

Gemini 3.5 Flash currently has 29 sourced benchmark scores on BenchLM.

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

Gemini 3.8 Flash currently has 31 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)
- [Gemini 3.8 Flash vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-cyber-vs-gemini-3-8-flash)
- [Gemini 3.5 Flash vs Gemini 3.8 Flash Cyber](/compare/gemini-3-5-flash-vs-gemini-3-8-flash-cyber)
- [Gemini 3.8 Flash vs Gemini 3.8 Flash Cyber](/compare/gemini-3-8-flash-vs-gemini-3-8-flash-cyber)

## Explore More

- [Gemini 3.5 Flash profile](/models/gemini-3-5-flash)
- [Gemini 3.8 Flash profile](/models/gemini-3-8-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)