# Claude Sonnet 5 vs Laguna S 2.1

> Side-by-side benchmark comparison for Claude Sonnet 5 and Laguna S 2.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-5-vs-laguna-s-2-1
- Last updated: September 4, 2026

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

## Quick Verdict

Pick Claude Sonnet 5 if you want the stronger benchmark profile. Laguna S 2.1 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Sonnet 5 leads overall 70.76 to 56.
- The clearest category separation is in agentic, where the averages are 66 for Claude Sonnet 5 and 48.2 for Laguna S 2.1.
- The biggest single benchmark swing is Terminal-Bench 2.0 in Agentic, with scores of 80.4% and 70.2%.
- Laguna S 2.1 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Sonnet 5 | Laguna S 2.1 |
|----------|----------|----------|
| Creator | Anthropic | Poolside |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 70.76 | null |
| Benchmarks Covered | 23 | 6 |
| Pricing (input/output) | $2.00 / $10.00 | $0.10 / $0.20 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Sonnet 5 public-lane score: 66 (Supported · #12/151)
- Laguna S 2.1 public-lane score: 48.2 (Estimated · #77/151)

| Benchmark | Claude Sonnet 5 | Laguna S 2.1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 14.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 80.4% | 70.2% | Claude Sonnet 5 |
| 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 |
| Toolathlon-Verified | Coming soon | 49.7% | Coming soon |

### Coding

- Winner: Coming soon
- Claude Sonnet 5 public-lane score: 64.2 (Supported · #13/183)
- Laguna S 2.1 public-lane score: 47.8 (Estimated · #87/183)

| Benchmark | Claude Sonnet 5 | Laguna S 2.1 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85.2% | Coming soon | Coming soon |
| SWE-bench Pro | 63.2% | 59.4% | Claude Sonnet 5 |
| SWE Multilingual | 78.3% | 78.5% | Laguna S 2.1 |
| SWE Multimodal | 28.1% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 80.4% | 70.2% | Claude Sonnet 5 |
| FrontierCode 1.1 Main | 42.7% | Coming soon | Coming soon |
| cursorBench32 | 61.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 82.4% | Coming soon | Coming soon |
| SWE-bench (Vals) | 79.6% | Coming soon | Coming soon |
| deepSwe | Coming soon | 40.4% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Sonnet 5 public-lane score: 77.3 (#13/48)
- Laguna S 2.1 public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | Laguna S 2.1 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 88.3% | Coming soon | Coming soon |
| CharXiv w/o tools | 77% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Sonnet 5 public-lane score: 76.4 (Unranked · 2 rankable rows)
- Laguna S 2.1 public-lane score: Coming soon

### Knowledge

- Winner: Coming soon
- Claude Sonnet 5 public-lane score: 67.1 (Supported · #20/181)
- Laguna S 2.1 public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | Laguna S 2.1 | 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 |

## FAQ

### Which is better overall, Claude Sonnet 5 or Laguna S 2.1?

Claude Sonnet 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Sonnet 5 and Laguna S 2.1?

The widest category gap is in agentic, where the averages are 66 for Claude Sonnet 5 and 48.2 for Laguna S 2.1.

### How many benchmarks does Claude Sonnet 5 cover on BenchLM?

Claude Sonnet 5 currently has 23 sourced benchmark scores on BenchLM.

### How many benchmarks does Laguna S 2.1 cover on BenchLM?

Laguna S 2.1 currently has 6 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 5 vs Laguna M.1](/compare/claude-sonnet-5-vs-laguna-m-1)
- [Laguna S 2.1 vs Laguna M.1](/compare/laguna-m-1-vs-laguna-s-2-1)
- [Claude Sonnet 5 vs Laguna XS.2](/compare/claude-sonnet-5-vs-laguna-xs-2)
- [Laguna S 2.1 vs Laguna XS.2](/compare/laguna-s-2-1-vs-laguna-xs-2)

## Explore More

- [Claude Sonnet 5 profile](/models/claude-sonnet-5)
- [Laguna S 2.1 profile](/models/laguna-s-2-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)