# Claude Sonnet 5 vs SWE-2 Flash

> Side-by-side benchmark comparison for Claude Sonnet 5 and SWE-2 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-5-vs-swe-2-flash
- Last updated: November 5, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Sonnet 5 and SWE-2 Flash 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.
- SWE-2 Flash has the lower published output-token price.

## Model Snapshot

| Property | Claude Sonnet 5 | SWE-2 Flash |
|----------|----------|----------|
| Creator | Anthropic | Cognition |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | 64.45 | null |
| Benchmarks Covered | 31 | 7 |
| Pricing (input/output) | $2.00 / $10.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Sonnet 5 public-lane score: 65 (Supported · #17/135)
- SWE-2 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | SWE-2 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 14.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 80.4% | 89.2% | SWE-2 Flash |
| BrowseComp | 84.7% | Coming soon | Coming soon |
| HLE w/ tools | 57.4% | Coming soon | Coming soon |
| OSWorld-Verified | 81.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 74.5% | Coming soon | Coming soon |
| ApprenticeBench | 16% | Coming soon | Coming soon |
| MazeBench | 0% | Coming soon | Coming soon |
| OSWorld 2.1 | 57.0% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 20.00% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Sonnet 5 public-lane score: 57.4 (Supported · #24/156)
- SWE-2 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | SWE-2 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85.2% | Coming soon | Coming soon |
| SWE-bench Pro | 63.2% | Coming soon | Coming soon |
| SWE Multilingual | 78.3% | Coming soon | Coming soon |
| SWE Multimodal | 28.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 80.4% | 89.2% | SWE-2 Flash |
| FrontierCode 1.1 Main | 42.7% | 45.5% | SWE-2 Flash |
| CursorBench 3.2 | 61.5% | Coming soon | Coming soon |
| VulcanBench CII v1 | 89.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 82.4% | Coming soon | Coming soon |
| SWE-bench (Vals) | 79.6% | Coming soon | Coming soon |
| CursorBench 4.0 | 34.1% | Coming soon | Coming soon |
| DeepSWE | Coming soon | 60.1% | Coming soon |
| SWE-Atlas Codebase QnA | Coming soon | 50.0% | Coming soon |
| FrontierCode 2.0 | Coming soon | 24.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Sonnet 5 public-lane score: 81.3 (Unranked · 2 rankable rows)
- SWE-2 Flash public-lane score: Coming soon

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Claude Sonnet 5 public-lane score: 80.3 (#20/58)
- SWE-2 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | SWE-2 Flash | Winner |
|-----------|-----------|-----------|--------|
| ParseBench | 61.16% | Coming soon | Coming soon |
| CharXiv | 88.3% | Coming soon | Coming soon |
| CharXiv w/o tools | 77% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude Sonnet 5 public-lane score: 64.6 (Supported · #35/177)
- SWE-2 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | SWE-2 Flash | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.4% | Coming soon | Coming soon |
| HLE w/o tools | 43.2% | Coming soon | Coming soon |
| HLE-Verified | 31.0% | Coming soon | Coming soon |
| LABBench2 | 80.1% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 88.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 87.5% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Sonnet 5 public-lane score: 69.4 (Unranked · 2 rankable rows)
- SWE-2 Flash public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | SWE-2 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 65.614% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 29.268% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Sonnet 5 and SWE-2 Flash?

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 5 vs SWE-1.7](/compare/claude-sonnet-5-vs-swe-1-7)
- [SWE-2 Flash vs SWE-1.7](/compare/swe-1-7-vs-swe-2-flash)
- [Claude Sonnet 5 vs SWE-2](/compare/claude-sonnet-5-vs-swe-2)
- [SWE-2 Flash vs SWE-2](/compare/swe-2-vs-swe-2-flash)

## Explore More

- [Claude Sonnet 5 profile](/models/claude-sonnet-5)
- [SWE-2 Flash profile](/models/swe-2-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)