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Model comparison

LFM2.5-VL-450M vs Mellum2-12B-A2.5B-Thinking

Data verified

Head-to-head evidence from 3 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

N/A
No comparison
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0 category wins2 category wins

Evidence parity. LFM2.5-VL-450M and Mellum2-12B-A2.5B-Thinking share 3 comparable benchmark results. 2 of 8 categories are comparable. 4 results are unique to LFM2.5-VL-450M; 2 to Mellum2-12B-A2.5B-Thinking.

Updated July 23, 2026
Shared results
3
LFM2.5-VL-450M only
4
Mellum2-12B-A2.5B-Thinking only
2
Comparable categories
2 / 8

Treat this as a split decision. LFM2.5-VL-450M makes more sense if you would rather avoid the extra latency and token burn of a reasoning model; Mellum2-12B-A2.5B-Thinking is the better fit if knowledge is the priority or you want the stronger reasoning-first profile.

Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 3 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

LFM2.5-VL-450M and Mellum2-12B-A2.5B-Thinking finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.

Mellum2-12B-A2.5B-Thinking is the reasoning model in the pair, while LFM2.5-VL-450M is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for LFM2.5-VL-450M and Mellum2-12B-A2.5B-Thinking
CategoryLFM2.5-VL-450MΔMellum2-12B-A2.5B-Thinking
KnowledgeLFM2.5-VL-450M20.5Margin→ 37.1Mellum2-12B-A2.5B-Thinking57.6
Inst. FollowingLFM2.5-VL-450M61.2Margin→ 15.3Mellum2-12B-A2.5B-Thinking76.5

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · LFM2.5-VL-450MB · Mellum2-12B-A2.5B-Thinking

  1. GPQA

    Knowledge
    Source ↗
    A 25.7%B 57.6%
    Winner: Mellum2-12B-A2.5B-ThinkingΔ 31.9
    GPQA: LFM2.5-VL-450M scored 25.7%; Mellum2-12B-A2.5B-Thinking scored 57.6%. Mellum2-12B-A2.5B-Thinking wins this benchmark.

  2. IFEval

    Inst. Following
    Source ↗
    A 61.2%B 76.5%
    Winner: Mellum2-12B-A2.5B-ThinkingΔ 15.3
    IFEval: LFM2.5-VL-450M scored 61.2%; Mellum2-12B-A2.5B-Thinking scored 76.5%. Mellum2-12B-A2.5B-Thinking wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricLFM2.5-VL-450MMellum2-12B-A2.5B-ThinkingComparison
Input / output priceUSD per 1M tokensLFM2.5-VL-450M$0 input / $0 outputMellum2-12B-A2.5B-ThinkingNot availableA complete price comparison is not available.
Generation speedtokens per secondLFM2.5-VL-450MNot availableMellum2-12B-A2.5B-ThinkingNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenLFM2.5-VL-450MNot availableMellum2-12B-A2.5B-ThinkingNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensLFM2.5-VL-450M128KMellum2-12B-A2.5B-Thinking128KListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-ThinkingResult
BFCL v4Source 21.1%45.6%Mellum2-12B-A2.5B-Thinking leads
KnowledgeMellum2-12B-A2.5B-Thinking wins
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-ThinkingResult
GPQASource 25.7%57.6%Mellum2-12B-A2.5B-Thinking leads
MMLU-ProSource 19.3%—Not comparable
MMLU-ReduxSource —86.2%Not comparable
GPQA-DSource —57.6%Not comparable
Multimodal
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-ThinkingResult
MMMUSource 32.7%—Not comparable
RealWorldQASource 58.4%—Not comparable
CountBenchSource 73.3%—Not comparable
Inst. FollowingMellum2-12B-A2.5B-Thinking wins
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-ThinkingResult
IFEvalSource 61.2%76.5%Mellum2-12B-A2.5B-Thinking leads
Frequently Asked Questions (3)

Which is better, LFM2.5-VL-450M or Mellum2-12B-A2.5B-Thinking?

LFM2.5-VL-450M and Mellum2-12B-A2.5B-Thinking are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.

Which is better for knowledge tasks, LFM2.5-VL-450M or Mellum2-12B-A2.5B-Thinking?

Mellum2-12B-A2.5B-Thinking has the edge for knowledge tasks in this comparison, averaging 57.6 versus 20.5. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for instruction following, LFM2.5-VL-450M or Mellum2-12B-A2.5B-Thinking?

Mellum2-12B-A2.5B-Thinking has the edge for instruction following in this comparison, averaging 76.5 versus 61.2. Inside this category, IFEval is the benchmark that creates the most daylight between them.

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