# Laguna S 2.1 vs Step 3.5 Flash

> Side-by-side benchmark comparison for Laguna S 2.1 and Step 3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/laguna-s-2-1-vs-step-3-5-flash
- Last updated: September 4, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Laguna S 2.1 and Step 3.5 Flash.

## Summary

- Laguna S 2.1 and Step 3.5 Flash do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Laguna S 2.1 | Step 3.5 Flash |
|----------|----------|----------|
| Creator | Poolside | StepFun |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M | 256K |
| Independent public score (not head-to-head) | null | 53.09 |
| Benchmarks Covered | 6 | 0 |
| Pricing (input/output) | $0.10 / $0.20 | $0.10 / $0.30 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Laguna S 2.1 public-lane score: 48.2 (Estimated · #77/151)
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | Laguna S 2.1 | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 70.2% | Coming soon | Coming soon |
| Toolathlon-Verified | 49.7% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Laguna S 2.1 public-lane score: 47.8 (Estimated · #87/183)
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | Laguna S 2.1 | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 70.2% | Coming soon | Coming soon |
| SWE Multilingual | 78.5% | Coming soon | Coming soon |
| SWE-bench Pro | 59.4% | Coming soon | Coming soon |
| deepSwe | 40.4% | Coming soon | Coming soon |

## FAQ

### Can I compare Laguna S 2.1 and Step 3.5 Flash on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Laguna S 2.1 vs Laguna M.1](/compare/laguna-m-1-vs-laguna-s-2-1)
- [Step 3.5 Flash vs Laguna M.1](/compare/laguna-m-1-vs-step-3-5-flash)
- [Laguna S 2.1 vs Laguna XS.2](/compare/laguna-s-2-1-vs-laguna-xs-2)
- [Step 3.5 Flash vs Laguna XS.2](/compare/laguna-xs-2-vs-step-3-5-flash)

## Explore More

- [Laguna S 2.1 profile](/models/laguna-s-2-1)
- [Step 3.5 Flash profile](/models/step-3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)