Claude 4 Sonnet vs LFM2.5-1.2B-Instruct

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

Claude 4 Sonnet is clearly ahead on the aggregate, 64 to 30. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude 4 Sonnet's sharpest advantage is in multimodal & grounded, where it averages 79.7 against 32.4. The single biggest benchmark swing on the page is MMMU-Pro, 81 to 27.

Claude 4 Sonnet gives you the larger context window at 200K, compared with 32K for LFM2.5-1.2B-Instruct.

Quick Verdict

Pick Claude 4 Sonnet 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

Claude 4 Sonnet

Claude 4 Sonnet

57.9

LFM2.5-1.2B-Instruct

25.7

56
Terminal-Bench 2.0
22
62
BrowseComp
31
57
OSWorld-Verified
26

Coding

Claude 4 Sonnet

Claude 4 Sonnet

42.9

LFM2.5-1.2B-Instruct

7.2

65
HumanEval
14
51
SWE-bench Verified
9
36
LiveCodeBench
8
48
SWE-bench Pro
6

Multimodal & Grounded

Claude 4 Sonnet

Claude 4 Sonnet

79.7

LFM2.5-1.2B-Instruct

32.4

81
MMMU-Pro
27
78
OfficeQA Pro
39

Reasoning

Claude 4 Sonnet

Claude 4 Sonnet

71.8

LFM2.5-1.2B-Instruct

32.1

71
SimpleQA
24
69
MuSR
22
82
BBH
59
71
LongBench v2
34
72
MRCRv2
37

Knowledge

Claude 4 Sonnet

Claude 4 Sonnet

56.8

LFM2.5-1.2B-Instruct

26

73
MMLU
26
73
GPQA
25
71
SuperGPQA
23
69
OpenBookQA
21
75
MMLU-Pro
50
12
HLE
1
67
FrontierScience
30

Instruction Following

Claude 4 Sonnet

Claude 4 Sonnet

83

LFM2.5-1.2B-Instruct

80

83
IFEval
80

Multilingual

Claude 4 Sonnet

Claude 4 Sonnet

82.1

LFM2.5-1.2B-Instruct

60.7

84
MGSM
62
81
MMLU-ProX
60

Mathematics

Claude 4 Sonnet

Claude 4 Sonnet

76.1

LFM2.5-1.2B-Instruct

37

73
AIME 2023
24
75
AIME 2024
26
74
AIME 2025
25
69
HMMT Feb 2023
20
71
HMMT Feb 2024
22
70
HMMT Feb 2025
21
72
BRUMO 2025
23
81
MATH-500
54

Frequently Asked Questions

Which is better, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet is ahead overall, 64 to 30. The biggest single separator in this matchup is MMMU-Pro, where the scores are 81 and 27.

Which is better for knowledge tasks, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for knowledge tasks in this comparison, averaging 56.8 versus 26. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for coding, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for coding in this comparison, averaging 42.9 versus 7.2. Inside this category, HumanEval is the benchmark that creates the most daylight between them.

Which is better for math, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for math in this comparison, averaging 76.1 versus 37. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.

Which is better for reasoning, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for reasoning in this comparison, averaging 71.8 versus 32.1. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for agentic tasks in this comparison, averaging 57.9 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, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for multimodal and grounded tasks in this comparison, averaging 79.7 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 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for instruction following in this comparison, averaging 83 versus 80. Inside this category, IFEval is the benchmark that creates the most daylight between them.

Which is better for multilingual tasks, Claude 4 Sonnet or LFM2.5-1.2B-Instruct?

Claude 4 Sonnet has the edge for multilingual tasks in this comparison, averaging 82.1 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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