Model comparison
LFM2.5-1.2B-Thinking vs Nemotron Ultra 253B
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: LFM2.5-1.2B-Thinking #209 (Supported); Nemotron Ultra 253B #158 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. LFM2.5-1.2B-Thinking and Nemotron Ultra 253B share 0 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to LFM2.5-1.2B-Thinking; 11 to Nemotron Ultra 253B.
Updated July 28, 2026- Shared results
- 0
- LFM2.5-1.2B-Thinking only
- 0
- Nemotron Ultra 253B only
- 11
- Comparable categories
- 0 / 8
Benchmark data for LFM2.5-1.2B-Thinking and Nemotron Ultra 253B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM does not have sourced benchmark coverage for LFM2.5-1.2B-Thinking yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | LFM2.5-1.2B-Thinking | Nemotron Ultra 253B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | LFM2.5-1.2B-Thinking$0 input / $0 output | Nemotron Ultra 253B$0 input / $0 output | Listed prices are equal. |
| Generation speedtokens per second | LFM2.5-1.2B-ThinkingNot available | Nemotron Ultra 253BNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | LFM2.5-1.2B-ThinkingNot available | Nemotron Ultra 253BNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | LFM2.5-1.2B-Thinking32K | Nemotron Ultra 253B32K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | LFM2.5-1.2B-Thinking | Nemotron Ultra 253B | Result |
|---|---|---|---|
| τ²-bench resultsSource | — | 11.4% | Not comparable |
Coding1 benchmarks
| Benchmark | LFM2.5-1.2B-Thinking | Nemotron Ultra 253B | Result |
|---|---|---|---|
| AA-SciCodeSource | — | 34.7% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | LFM2.5-1.2B-Thinking | Nemotron Ultra 253B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | — | 9.1% | Not comparable |
| AA-GPQA DiamondSource | — | 72.8% | Not comparable |
| AA-HLESource | — | 8.1% | Not comparable |
| AA-Omniscience IndexSource | — | -45.5% | Not comparable |
| AA-Omniscience AccuracySource | — | 19.9% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 81.7% | Not comparable |
Inst. Following1 benchmarks
| Benchmark | LFM2.5-1.2B-Thinking | Nemotron Ultra 253B | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 38.2% | Not comparable |
Frequently Asked Questions (3)
Can I compare LFM2.5-1.2B-Thinking and Nemotron Ultra 253B on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for LFM2.5-1.2B-Thinking and Nemotron Ultra 253B today?
LFM2.5-1.2B-Thinking: $0.00 input / $0.00 output per 1M tokens Nemotron Ultra 253B: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
Related Comparisons
Explore More
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
One email each week. Unsubscribe anytime.