Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude 3.5 Sonnet is clearly ahead on the aggregate, 60 to 33. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude 3.5 Sonnet's sharpest advantage is in multimodal & grounded, where it averages 74.8 against 32.4. The single biggest benchmark swing on the page is MMMU-Pro, 77 to 27.
LFM2.5-1.2B-Thinking is the reasoning model in the pair, while Claude 3.5 Sonnet 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. Claude 3.5 Sonnet gives you the larger context window at 200K, compared with 32K for LFM2.5-1.2B-Thinking.
Pick Claude 3.5 Sonnet if you want the stronger benchmark profile. LFM2.5-1.2B-Thinking only becomes the better choice if you want the stronger reasoning-first profile.
Claude 3.5 Sonnet
55
LFM2.5-1.2B-Thinking
34.1
Claude 3.5 Sonnet
37.8
LFM2.5-1.2B-Thinking
8.2
Claude 3.5 Sonnet
74.8
LFM2.5-1.2B-Thinking
32.4
Claude 3.5 Sonnet
67.7
LFM2.5-1.2B-Thinking
38.4
Claude 3.5 Sonnet
50.8
LFM2.5-1.2B-Thinking
27
Claude 3.5 Sonnet
83
LFM2.5-1.2B-Thinking
72
Claude 3.5 Sonnet
80.5
LFM2.5-1.2B-Thinking
60.7
Claude 3.5 Sonnet
71.2
LFM2.5-1.2B-Thinking
42.3
Claude 3.5 Sonnet is ahead overall, 60 to 33. The biggest single separator in this matchup is MMMU-Pro, where the scores are 77 and 27.
Claude 3.5 Sonnet has the edge for knowledge tasks in this comparison, averaging 50.8 versus 27. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for coding in this comparison, averaging 37.8 versus 8.2. Inside this category, HumanEval is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for math in this comparison, averaging 71.2 versus 42.3. Inside this category, AIME 2023 is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for reasoning in this comparison, averaging 67.7 versus 38.4. Inside this category, SimpleQA is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for agentic tasks in this comparison, averaging 55 versus 34.1. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for multimodal and grounded tasks in this comparison, averaging 74.8 versus 32.4. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for instruction following in this comparison, averaging 83 versus 72. Inside this category, IFEval is the benchmark that creates the most daylight between them.
Claude 3.5 Sonnet has the edge for multilingual tasks in this comparison, averaging 80.5 versus 60.7. Inside this category, MGSM is the benchmark that creates the most daylight between them.
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