Model comparison
LFM2.5-1.2B-Thinking vs Mellum2-12B-A2.5B-Instruct
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 #199 (Supported); Mellum2-12B-A2.5B-Instruct unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. LFM2.5-1.2B-Thinking and Mellum2-12B-A2.5B-Instruct share 0 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to LFM2.5-1.2B-Thinking; 5 to Mellum2-12B-A2.5B-Instruct.
Updated July 23, 2026- Shared results
- 0
- LFM2.5-1.2B-Thinking only
- 0
- Mellum2-12B-A2.5B-Instruct only
- 5
- Comparable categories
- 0 / 8
Benchmark data for LFM2.5-1.2B-Thinking and Mellum2-12B-A2.5B-Instruct 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.
Mellum2-12B-A2.5B-Instruct has the larger context window at 128K, compared with 32K for LFM2.5-1.2B-Thinking.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | LFM2.5-1.2B-Thinking | Mellum2-12B-A2.5B-Instruct | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | LFM2.5-1.2B-Thinking$0 input / $0 output | Mellum2-12B-A2.5B-InstructNot available | A complete price comparison is not available. |
| Generation speedtokens per second | LFM2.5-1.2B-ThinkingNot available | Mellum2-12B-A2.5B-InstructNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | LFM2.5-1.2B-ThinkingNot available | Mellum2-12B-A2.5B-InstructNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | LFM2.5-1.2B-Thinking32K | Mellum2-12B-A2.5B-Instruct128K | Mellum2-12B-A2.5B-Instruct lists the larger context window. |
Benchmark Deep Dive
Frequently Asked Questions (3)
Can I compare LFM2.5-1.2B-Thinking and Mellum2-12B-A2.5B-Instruct 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 Mellum2-12B-A2.5B-Instruct today?
LFM2.5-1.2B-Thinking: $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.
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