# Grok 4.5 vs LongCat-Flash-Lite-Sparse

> Side-by-side benchmark comparison for Grok 4.5 and LongCat-Flash-Lite-Sparse across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-5-vs-longcat-flash-lite-sparse
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Grok 4.5 if you want the stronger benchmark profile. LongCat-Flash-Lite-Sparse only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.5 leads overall 68.1 to 0.
- The biggest single benchmark swing is Terminal-Bench 2.0 in Agentic, with scores of 83.3% and 33.7%.
- LongCat-Flash-Lite-Sparse is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- LongCat-Flash-Lite-Sparse also has the larger context window at 1M.

## Model Snapshot

| Property | Grok 4.5 | LongCat-Flash-Lite-Sparse |
|----------|----------|----------|
| Creator | xAI | Meituan |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 500K | 1M |
| Overall Score | 68.1 | null |
| Benchmarks Covered | 15 | 17 |
| Pricing (input/output) | $2.00 / $6.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Grok 4.5 public-lane score: 60.5 (Supported · #19/152)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Grok 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 15.7% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 83.3% | 33.7% | Grok 4.5 |
| deepSwe | 53% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 67.8% | Coming soon | Coming soon |
| VITA-Bench | Coming soon | 21.7% | Coming soon |
| MCP Atlas | Coming soon | 45.6% | Coming soon |
| BrowseComp | Coming soon | 48.6% | Coming soon |

### Coding

- Winner: Coming soon
- Grok 4.5 public-lane score: 62.2 (Supported · #16/151)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Grok 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 64.7% | 40.6% | Grok 4.5 |
| SWE Multilingual | 78% | 59.3% | Grok 4.5 |
| Terminal-Bench 2.0 | 83.3% | 33.7% | Grok 4.5 |
| cursorBench32 | 66.7% | Coming soon | Coming soon |
| VulcanBench v3 | 89.9% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.4% | Coming soon | Coming soon |
| SWE-bench (Vals) | 86.6% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 68.2% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Grok 4.5 public-lane score: 78.4 (Unranked · 1 rankable row)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

### Reasoning

- Winner: Coming soon
- Grok 4.5 public-lane score: 44.8 (#20/20)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Grok 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 52.6% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.3% | Coming soon | Coming soon |

### Knowledge

- Winner: Coming soon
- Grok 4.5 public-lane score: 69.4 (Supported · #14/183)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Grok 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 92.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 89.2% | Coming soon | Coming soon |
| MMLU | Coming soon | 85.3% | Coming soon |
| MMLU-Pro | Coming soon | 79.2% | Coming soon |
| CMMLU | Coming soon | 84.3% | Coming soon |
| C-Eval | Coming soon | 85.8% | Coming soon |
| GPQA-D | Coming soon | 69.5% | Coming soon |

### Mathematics

- Winner: Coming soon
- Grok 4.5 public-lane score: Coming soon
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Grok 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| MATH-500 | Coming soon | 95.8% | Coming soon |
| AIME26 | Coming soon | 65.7% | Coming soon |
| HMMT Feb 2026 | Coming soon | 40.5% | Coming soon |
| IMOAnswerBench | Coming soon | 49.4% | Coming soon |

## FAQ

### Which is better overall, Grok 4.5 or LongCat-Flash-Lite-Sparse?

Grok 4.5 is ahead overall on BenchLM right now.

### How many benchmarks does Grok 4.5 cover on BenchLM?

Grok 4.5 currently has 15 sourced benchmark scores on BenchLM.

### How many benchmarks does LongCat-Flash-Lite-Sparse cover on BenchLM?

LongCat-Flash-Lite-Sparse currently has 17 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Grok 4.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-4-5)
- [LongCat-Flash-Lite-Sparse vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-longcat-flash-lite-sparse)
- [Grok 4.5 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-5)
- [LongCat-Flash-Lite-Sparse vs GPT-6 Astra](/compare/gpt-6-astra-vs-longcat-flash-lite-sparse)

## Explore More

- [Grok 4.5 profile](/models/grok-4-5)
- [LongCat-Flash-Lite-Sparse profile](/models/longcat-flash-lite-sparse)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)