Claude 3 Haiku vs LFM2.5-1.2B-Instruct

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

Claude 3 Haiku is clearly ahead on the aggregate, 49 to 30. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude 3 Haiku's sharpest advantage is in multimodal & grounded, where it averages 68.7 against 32.4. The single biggest benchmark swing on the page is MMMU-Pro, 70 to 27. LFM2.5-1.2B-Instruct does hit back in instruction following, so the answer changes if that is the part of the workload you care about most.

Claude 3 Haiku gives you the larger context window at 200K, compared with 32K for LFM2.5-1.2B-Instruct.

Quick Verdict

Pick Claude 3 Haiku if you want the stronger benchmark profile. LFM2.5-1.2B-Instruct only becomes the better choice if instruction following is the priority.

Agentic

Claude 3 Haiku

Claude 3 Haiku

44

LFM2.5-1.2B-Instruct

25.7

40
Terminal-Bench 2.0
22
53
BrowseComp
31
42
OSWorld-Verified
26

Coding

Claude 3 Haiku

Claude 3 Haiku

19.3

LFM2.5-1.2B-Instruct

7.2

48
HumanEval
14
17
SWE-bench Verified
9
20
LiveCodeBench
8
19
SWE-bench Pro
6

Multimodal & Grounded

Claude 3 Haiku

Claude 3 Haiku

68.7

LFM2.5-1.2B-Instruct

32.4

70
MMMU-Pro
27
67
OfficeQA Pro
39

Reasoning

Claude 3 Haiku

Claude 3 Haiku

59.6

LFM2.5-1.2B-Instruct

32.1

54
SimpleQA
24
52
MuSR
22
74
BBH
59
63
LongBench v2
34
63
MRCRv2
37

Knowledge

Claude 3 Haiku

Claude 3 Haiku

42.8

LFM2.5-1.2B-Instruct

26

56
MMLU
26
56
GPQA
25
54
SuperGPQA
23
52
OpenBookQA
21
63
MMLU-Pro
50
2
HLE
1
50
FrontierScience
30

Instruction Following

LFM2.5-1.2B-Instruct

Claude 3 Haiku

76

LFM2.5-1.2B-Instruct

80

76
IFEval
80

Multilingual

Claude 3 Haiku

Claude 3 Haiku

71.1

LFM2.5-1.2B-Instruct

60.7

73
MGSM
62
70
MMLU-ProX
60

Mathematics

Claude 3 Haiku

Claude 3 Haiku

62.2

LFM2.5-1.2B-Instruct

37

56
AIME 2023
24
58
AIME 2024
26
57
AIME 2025
25
52
HMMT Feb 2023
20
54
HMMT Feb 2024
22
53
HMMT Feb 2025
21
55
BRUMO 2025
23
71
MATH-500
54

Frequently Asked Questions

Which is better, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku is ahead overall, 49 to 30. The biggest single separator in this matchup is MMMU-Pro, where the scores are 70 and 27.

Which is better for knowledge tasks, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for knowledge tasks in this comparison, averaging 42.8 versus 26. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for coding, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for coding in this comparison, averaging 19.3 versus 7.2. Inside this category, HumanEval is the benchmark that creates the most daylight between them.

Which is better for math, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for math in this comparison, averaging 62.2 versus 37. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.

Which is better for reasoning, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for reasoning in this comparison, averaging 59.6 versus 32.1. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for agentic tasks in this comparison, averaging 44 versus 25.7. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for multimodal and grounded tasks in this comparison, averaging 68.7 versus 32.4. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.

Which is better for instruction following, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

LFM2.5-1.2B-Instruct has the edge for instruction following in this comparison, averaging 80 versus 76. Inside this category, IFEval is the benchmark that creates the most daylight between them.

Which is better for multilingual tasks, Claude 3 Haiku or LFM2.5-1.2B-Instruct?

Claude 3 Haiku has the edge for multilingual tasks in this comparison, averaging 71.1 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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