# Gemini 3.1 Flash-Lite vs Grok 4.3

> Side-by-side benchmark comparison for Gemini 3.1 Flash-Lite and Grok 4.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-1-flash-lite-vs-grok-4-3
- Last updated: September 10, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Grok 4.3 if you want the stronger benchmark profile. Gemini 3.1 Flash-Lite only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.3 leads overall 59.73 to 56.19.
- The clearest category separation is in multimodal & grounded, where the averages are 37.5 for Gemini 3.1 Flash-Lite and 65.6 for Grok 4.3.
- The biggest single benchmark swing is GPQA Diamond (Vals) in Knowledge, with scores of 81.1% and 91.4%.
- Gemini 3.1 Flash-Lite is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Gemini 3.1 Flash-Lite | Grok 4.3 |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 56.19 | 59.73 |
| Benchmarks Covered | 8 | 7 |
| Pricing (input/output) | $0.25 / $1.50 | $1.25 / $2.50 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Gemini 3.1 Flash-Lite public-lane score: 42.9 (Estimated · #101/152)
- Grok 4.3 public-lane score: 26.9 (Supported · #144/152)

| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 38.46% | 43.86% | Grok 4.3 |
| Terminal-Bench 2.1 (Vals) | 34.1% | 41.9% | Grok 4.3 |
| ResearchClawBench | Coming soon | 12.4% | Coming soon |

### Coding

- Winner: Coming soon
- Gemini 3.1 Flash-Lite public-lane score: 37.9 (Estimated · #124/151)
- Grok 4.3 public-lane score: 33.6 (Supported · #131/151)

| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 0.00% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 80.1% | 84.5% | Grok 4.3 |
| SWE-bench (Vals) | 62.8% | 71.4% | Grok 4.3 |

### Multimodal & Grounded

- Winner: Coming soon
- Gemini 3.1 Flash-Lite public-lane score: 37.5 (Unranked · 1 rankable row)
- Grok 4.3 public-lane score: 65.6 (#25/48)

| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 73.2% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Gemini 3.1 Flash-Lite public-lane score: Coming soon
- Grok 4.3 public-lane score: 65.2 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Coming soon
- Gemini 3.1 Flash-Lite public-lane score: 51.5 (Estimated · #71/183)
- Grok 4.3 public-lane score: 57 (Supported · #44/183)

| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 81.1% | 91.4% | Grok 4.3 |
| MMLU-Pro (Vals) | 86.2% | 85.8% | Gemini 3.1 Flash-Lite |

### Instruction Following

- Winner: Coming soon
- Gemini 3.1 Flash-Lite public-lane score: Coming soon
- Grok 4.3 public-lane score: 94.4 (#2/123)

## FAQ

### Which is better overall, Gemini 3.1 Flash-Lite or Grok 4.3?

Grok 4.3 is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.1 Flash-Lite and Grok 4.3?

The widest category gap is in multimodal & grounded, where the averages are 37.5 for Gemini 3.1 Flash-Lite and 65.6 for Grok 4.3.

### How many benchmarks does Gemini 3.1 Flash-Lite cover on BenchLM?

Gemini 3.1 Flash-Lite currently has 8 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.3 cover on BenchLM?

Grok 4.3 currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.1 Flash-Lite vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-3-1-flash-lite)
- [Grok 4.3 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-4-3)
- [Gemini 3.1 Flash-Lite vs GPT-6 Astra](/compare/gemini-3-1-flash-lite-vs-gpt-6-astra)
- [Grok 4.3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-3)

## Explore More

- [Gemini 3.1 Flash-Lite profile](/models/gemini-3-1-flash-lite)
- [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)