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Model comparison

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

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-Instruct 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-Instruct.

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

Treat this as a split decision. LFM2.5-VL-450M makes more sense if its workflow fits your team better; Mellum2-12B-A2.5B-Instruct is the better fit if knowledge is the priority.

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-Instruct 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.

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-Instruct
CategoryLFM2.5-VL-450MΔMellum2-12B-A2.5B-Instruct
KnowledgeLFM2.5-VL-450M20.5Margin→ 20.4Mellum2-12B-A2.5B-Instruct40.9
Inst. FollowingLFM2.5-VL-450M61.2Margin→ 14.6Mellum2-12B-A2.5B-Instruct75.8

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-Instruct

  1. GPQA

    Knowledge
    Source ↗
    A 25.7%B 40.9%
    Winner: Mellum2-12B-A2.5B-InstructΔ 15.2
    GPQA: LFM2.5-VL-450M scored 25.7%; Mellum2-12B-A2.5B-Instruct scored 40.9%. Mellum2-12B-A2.5B-Instruct wins this benchmark.

  2. IFEval

    Inst. Following
    Source ↗
    A 61.2%B 75.8%
    Winner: Mellum2-12B-A2.5B-InstructΔ 14.6
    IFEval: LFM2.5-VL-450M scored 61.2%; Mellum2-12B-A2.5B-Instruct scored 75.8%. Mellum2-12B-A2.5B-Instruct 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-InstructComparison
Input / output priceUSD per 1M tokensLFM2.5-VL-450M$0 input / $0 outputMellum2-12B-A2.5B-InstructNot availableA complete price comparison is not available.
Generation speedtokens per secondLFM2.5-VL-450MNot availableMellum2-12B-A2.5B-InstructNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenLFM2.5-VL-450MNot availableMellum2-12B-A2.5B-InstructNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensLFM2.5-VL-450M128KMellum2-12B-A2.5B-Instruct128KListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-InstructResult
BFCL v4Source 21.1%44.2%Mellum2-12B-A2.5B-Instruct leads
KnowledgeMellum2-12B-A2.5B-Instruct wins
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-InstructResult
GPQASource 25.7%40.9%Mellum2-12B-A2.5B-Instruct leads
MMLU-ProSource 19.3%—Not comparable
MMLU-ReduxSource —78.1%Not comparable
GPQA-DSource —40.9%Not comparable
Multimodal
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-InstructResult
MMMUSource 32.7%—Not comparable
RealWorldQASource 58.4%—Not comparable
CountBenchSource 73.3%—Not comparable
Inst. FollowingMellum2-12B-A2.5B-Instruct wins
BenchmarkLFM2.5-VL-450MMellum2-12B-A2.5B-InstructResult
IFEvalSource 61.2%75.8%Mellum2-12B-A2.5B-Instruct leads
Frequently Asked Questions (3)

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

LFM2.5-VL-450M and Mellum2-12B-A2.5B-Instruct 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-Instruct?

Mellum2-12B-A2.5B-Instruct has the edge for knowledge tasks in this comparison, averaging 40.9 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-Instruct?

Mellum2-12B-A2.5B-Instruct has the edge for instruction following in this comparison, averaging 75.8 versus 61.2. Inside this category, IFEval is the benchmark that creates the most daylight between them.

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