# LFM2.5-8B-A1B vs Nemotron Ultra 253B

> Side-by-side benchmark comparison for LFM2.5-8B-A1B and Nemotron Ultra 253B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/lfm2-5-8b-a1b-vs-nemotron-ultra-253b
- Last updated: October 15, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: LFM2.5-8B-A1B and Nemotron Ultra 253B 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.
- LFM2.5-8B-A1B has the larger published context window at 128K.

## Model Snapshot

| Property | LFM2.5-8B-A1B | Nemotron Ultra 253B |
|----------|----------|----------|
| Creator | LiquidAI | NVIDIA |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 32K |
| Independent public score (not head-to-head) | 30.15 | null |
| Benchmarks Covered | 7 | 5 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: Coming soon
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | 49.7% | Coming soon | Coming soon |
| τ²-bench results | 88.1% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: Coming soon
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench | Coming soon | 66.3% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 25.9 (Unranked · 2 rankable rows)
- Nemotron Ultra 253B public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 26.4 (Supported · #167/182)
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 76.0% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 36.5 (#121/146)
- Nemotron Ultra 253B public-lane score: 0 (#142/146)

| Benchmark | LFM2.5-8B-A1B | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 91.8% | 89.5% | LFM2.5-8B-A1B |
| IFBench | 56.5% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- LFM2.5-8B-A1B public-lane score: 24 (Unranked · 3 rankable rows)
- Nemotron Ultra 253B public-lane score: Coming soon

| Benchmark | LFM2.5-8B-A1B | Nemotron Ultra 253B | Winner |
|-----------|-----------|-----------|--------|
| MATH-500 | 88.8% | 97% | Nemotron Ultra 253B |
| AIME 2025 | 42.5% | 72.5% | Nemotron Ultra 253B |
| AIME26 | 50.0% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between LFM2.5-8B-A1B and Nemotron Ultra 253B?

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

- [LFM2.5-8B-A1B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-lfm2-5-8b-a1b)
- [Nemotron Ultra 253B vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-nemotron-ultra-253b)
- [LFM2.5-8B-A1B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-lfm2-5-8b-a1b)
- [Nemotron Ultra 253B vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-nemotron-ultra-253b)

## Explore More

- [LFM2.5-8B-A1B profile](/models/lfm2-5-8b-a1b)
- [Nemotron Ultra 253B profile](/models/nemotron-ultra-253b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)