# LFM2.5-8B-A1B vs Step 3.5 Flash

> Side-by-side benchmark comparison for LFM2.5-8B-A1B and Step 3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/lfm2-5-8b-a1b-vs-step-3-5-flash
- Last updated: September 8, 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 LFM2.5-8B-A1B and Step 3.5 Flash.

## Summary

- LFM2.5-8B-A1B 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 | LFM2.5-8B-A1B | Step 3.5 Flash |
|----------|----------|----------|
| Creator | LiquidAI | StepFun |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 128K | 256K |
| Independent public score (not head-to-head) | 39.51 | 49.85 |
| Benchmarks Covered | 7 | 0 |
| Pricing (input/output) | $0.00 / $0.00 | $0.10 / $0.30 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 43.9 (Estimated · #95/152)
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | 49.7% | Coming soon | Coming soon |
| τ²-bench results | 88.1% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 21 (Unranked · 2 rankable rows)
- Step 3.5 Flash public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 34.6 (Supported · #162/182)
- Step 3.5 Flash public-lane score: Coming soon

### Instruction Following

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 44.7 (#93/121)
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 91.8% | Coming soon | Coming soon |
| IFBench | 56.5% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 27.7 (Unranked · 3 rankable rows)
- Step 3.5 Flash public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Step 3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| MATH-500 | 88.8% | Coming soon | Coming soon |
| AIME 2025 | 42.5% | Coming soon | Coming soon |
| AIME26 | 50.0% | Coming soon | Coming soon |

## FAQ

### Can I compare LFM2.5-8B-A1B 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

- [LFM2.5-8B-A1B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-lfm2-5-8b-a1b)
- [Step 3.5 Flash vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-step-3-5-flash)
- [LFM2.5-8B-A1B vs GPT-6 Astra](/compare/gpt-6-astra-vs-lfm2-5-8b-a1b)
- [Step 3.5 Flash vs GPT-6 Astra](/compare/gpt-6-astra-vs-step-3-5-flash)

## Explore More

- [LFM2.5-8B-A1B profile](/models/lfm2-5-8b-a1b)
- [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)