Llama 3.1 405B vs LFM2.5-1.2B-Instruct

Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.

Llama 3.1 405B is clearly ahead on the aggregate, 59 to 30. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Llama 3.1 405B's sharpest advantage is in mathematics, where it averages 74.9 against 37. The single biggest benchmark swing on the page is HumanEval, 62 to 14.

Llama 3.1 405B gives you the larger context window at 128K, compared with 32K for LFM2.5-1.2B-Instruct.

Quick Verdict

Pick Llama 3.1 405B if you want the stronger benchmark profile. LFM2.5-1.2B-Instruct only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.

Agentic

Llama 3.1 405B

Llama 3.1 405B

53.9

LFM2.5-1.2B-Instruct

25.7

53
Terminal-Bench 2.0
22
58
BrowseComp
31
52
OSWorld-Verified
26

Coding

Llama 3.1 405B

Llama 3.1 405B

40.6

LFM2.5-1.2B-Instruct

7.2

62
HumanEval
14
46
SWE-bench Verified
9
37
LiveCodeBench
8
43
SWE-bench Pro
6

Multimodal & Grounded

Llama 3.1 405B

Llama 3.1 405B

62.3

LFM2.5-1.2B-Instruct

32.4

60
MMMU-Pro
27
65
OfficeQA Pro
39

Reasoning

Llama 3.1 405B

Llama 3.1 405B

68.3

LFM2.5-1.2B-Instruct

32.1

68
SimpleQA
24
66
MuSR
22
82
BBH
59
68
LongBench v2
34
65
MRCRv2
37

Knowledge

Llama 3.1 405B

Llama 3.1 405B

53.2

LFM2.5-1.2B-Instruct

26

70
MMLU
26
70
GPQA
25
68
SuperGPQA
23
66
OpenBookQA
21
71
MMLU-Pro
50
7
HLE
1
65
FrontierScience
30

Instruction Following

Llama 3.1 405B

Llama 3.1 405B

86

LFM2.5-1.2B-Instruct

80

86
IFEval
80

Multilingual

Llama 3.1 405B

Llama 3.1 405B

80.1

LFM2.5-1.2B-Instruct

60.7

84
MGSM
62
78
MMLU-ProX
60

Mathematics

Llama 3.1 405B

Llama 3.1 405B

74.9

LFM2.5-1.2B-Instruct

37

70
AIME 2023
24
72
AIME 2024
26
71
AIME 2025
25
66
HMMT Feb 2023
20
68
HMMT Feb 2024
22
67
HMMT Feb 2025
21
69
BRUMO 2025
23
82
MATH-500
54

Frequently Asked Questions

Which is better, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B is ahead overall, 59 to 30. The biggest single separator in this matchup is HumanEval, where the scores are 62 and 14.

Which is better for knowledge tasks, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for knowledge tasks in this comparison, averaging 53.2 versus 26. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for coding, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for coding in this comparison, averaging 40.6 versus 7.2. Inside this category, HumanEval is the benchmark that creates the most daylight between them.

Which is better for math, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for math in this comparison, averaging 74.9 versus 37. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.

Which is better for reasoning, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for reasoning in this comparison, averaging 68.3 versus 32.1. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for agentic tasks in this comparison, averaging 53.9 versus 25.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for multimodal and grounded tasks in this comparison, averaging 62.3 versus 32.4. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.

Which is better for instruction following, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for instruction following in this comparison, averaging 86 versus 80. Inside this category, IFEval is the benchmark that creates the most daylight between them.

Which is better for multilingual tasks, Llama 3.1 405B or LFM2.5-1.2B-Instruct?

Llama 3.1 405B has the edge for multilingual tasks in this comparison, averaging 80.1 versus 60.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.

Last updated: March 12, 2026

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