# Claude Sonnet 4.5 vs LongCat-Flash-Lite-Sparse

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

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

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Sonnet 4.5 and LongCat-Flash-Lite-Sparse share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- LongCat-Flash-Lite-Sparse has the lower published output-token price.
- LongCat-Flash-Lite-Sparse has the larger published context window at 1M.

## Model Snapshot

| Property | Claude Sonnet 4.5 | LongCat-Flash-Lite-Sparse |
|----------|----------|----------|
| Creator | Anthropic | Meituan |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Independent public score (not head-to-head) | 53.82 | null |
| Benchmarks Covered | 11 | 17 |
| Pricing (input/output) | $3.00 / $15.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 44.2 (Estimated · #91/152)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50% | 33.7% | Claude Sonnet 4.5 |
| OSWorld-Verified | 61.4% | Coming soon | Coming soon |
| VITA-Bench | 17.0% | 21.7% | LongCat-Flash-Lite-Sparse |
| Gert Labs | 48.51% | Coming soon | Coming soon |
| JobBench | 27.7% | Coming soon | Coming soon |
| MCP Atlas | Coming soon | 45.6% | Coming soon |
| BrowseComp | Coming soon | 48.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 50.6 (Estimated · #54/151)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.2% | 68.2% | Claude Sonnet 4.5 |
| SWE-bench Pro | Coming soon | 40.6% | Coming soon |
| SWE Multilingual | Coming soon | 59.3% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 33.7% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 19.1 (Unranked · 1 rankable row)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 13.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 51.2 (Estimated · #73/183)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 83.4% | 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: Insufficient shared evidence
- Claude Sonnet 4.5 public-lane score: 34.8 (Unranked · 2 rankable rows)
- LongCat-Flash-Lite-Sparse public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.5 | LongCat-Flash-Lite-Sparse | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 87% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 13.495% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |
| 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

### Is there enough evidence to pick between Claude Sonnet 4.5 and LongCat-Flash-Lite-Sparse?

Not yet. The models share only 3 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Sonnet 4.5 vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-vs-claude-sonnet-4-5-thinking)
- [LongCat-Flash-Lite-Sparse vs Claude Sonnet 4.5 Thinking](/compare/claude-sonnet-4-5-thinking-vs-longcat-flash-lite-sparse)
- [Claude Sonnet 4.5 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-sonnet-4-5)
- [LongCat-Flash-Lite-Sparse vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-longcat-flash-lite-sparse)

## Explore More

- [Claude Sonnet 4.5 profile](/models/claude-sonnet-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)