# Gemini 3.8 Flash vs Grok 4.3

> Side-by-side benchmark comparison for Gemini 3.8 Flash and Grok 4.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-8-flash-vs-grok-4-3
- Last updated: October 17, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Gemini 3.8 Flash if you want the stronger benchmark profile. Grok 4.3 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 53.07.
- The clearest category separation is in agentic, where the averages are 65.9 for Gemini 3.8 Flash and 28.3 for Grok 4.3.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 81.3% and 41.9%.
- Grok 4.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Gemini 3.8 Flash | Grok 4.3 |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 69.25 | 53.07 |
| Benchmarks Covered | 31 | 9 |
| Pricing (input/output) | $0.75 / $3.75 | $1.25 / $2.50 |

## Category Breakdown

### Agentic

- Winner: Gemini 3.8 Flash
- Gemini 3.8 Flash public-lane score: 65.9 (Supported · #16/128)
- Grok 4.3 public-lane score: 28.3 (Supported · #96/128)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Finance Agent v2 | 61.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 89.4% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | 19.10% | Coming soon | Coming soon |
| OSWorld 2.0 | 59.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 81.3% | 41.9% | Gemini 3.8 Flash |
| ApprenticeBench | 24% | Coming soon | Coming soon |
| Hermes Index | 38.1% | Coming soon | Coming soon |
| Hermes Bench | 62.2% | Coming soon | Coming soon |
| MazeBench | 4% | Coming soon | Coming soon |
| Gert Labs | Coming soon | 43.86% | Coming soon |
| ResearchClawBench | Coming soon | 12.4% | Coming soon |

### Coding

- Winner: Gemini 3.8 Flash
- Gemini 3.8 Flash public-lane score: 61 (Supported · #17/150)
- Grok 4.3 public-lane score: 26.4 (Supported · #104/150)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 73.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 89.4% | Coming soon | Coming soon |
| CursorBench 3.2 | 69.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 89.5% | 84.5% | Gemini 3.8 Flash |
| SWE-bench (Vals) | 80.0% | 71.4% | Gemini 3.8 Flash |
| FrontierSWE v2 | 19.6% | Coming soon | Coming soon |
| CursorBench 4.0 | 39.6% | Coming soon | Coming soon |
| Bug Hunt Bench | 18.0 fixes | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 3.8 Flash public-lane score: 74.3 (#17/28)
- Grok 4.3 public-lane score: 70 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 89.2% | Coming soon | Coming soon |
| ARC-AGI-3 | 10.4% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemini 3.8 Flash public-lane score: 87.3 (#9/54)
- Grok 4.3 public-lane score: 78.8 (#20/54)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv w/o tools | 86.2% | Coming soon | Coming soon |
| LVBench | 87.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Gemini 3.8 Flash
- Gemini 3.8 Flash public-lane score: 73.5 (Supported · #13/184)
- Grok 4.3 public-lane score: 55 (Supported · #61/184)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| HLE-Verified | 54.9% | Coming soon | Coming soon |
| LABBench2 | 86.2% | Coming soon | Coming soon |
| BioMysteryBench (human-solvable) | 88.8% | Coming soon | Coming soon |
| BioMysteryBench (human-difficult) | 56.5% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 94.4% | 91.4% | Gemini 3.8 Flash |
| MMLU-Pro (Vals) | 90.2% | 85.8% | Gemini 3.8 Flash |

### Instruction Following

- Winner: Not comparable
- Gemini 3.8 Flash public-lane score: Coming soon
- Grok 4.3 public-lane score: 97.1 (#1/148)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 5.5% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Gemini 3.8 Flash public-lane score: 69.7 (Unranked · 2 rankable rows)
- Grok 4.3 public-lane score: 51.4 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.8 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 68.421% | 42.807% | Gemini 3.8 Flash |
| FrontierMath v2 (Tier 4) | 21.951% | 14.634% | Gemini 3.8 Flash |

## FAQ

### Which is better overall, Gemini 3.8 Flash or Grok 4.3?

Gemini 3.8 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.8 Flash and Grok 4.3?

The widest category gap is in agentic, where the averages are 65.9 for Gemini 3.8 Flash and 28.3 for Grok 4.3.

### 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 Grok 4.3 cover on BenchLM?

Grok 4.3 currently has 9 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)
- [Grok 4.3 vs Gemini 3.8 Flash Cyber](/compare/gemini-3-8-flash-cyber-vs-grok-4-3)
- [Gemini 3.8 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-8-flash)
- [Grok 4.3 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-3)

## Explore More

- [Gemini 3.8 Flash profile](/models/gemini-3-8-flash)
- [Grok 4.3 profile](/models/grok-4-3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)