Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude Sonnet 4.5
69
Winner · 2/8 categoriesLFM2.5-350M
~39
0/8 categoriesClaude Sonnet 4.5· LFM2.5-350M
Pick Claude Sonnet 4.5 if you want the stronger benchmark profile. LFM2.5-350M only becomes the better choice if you want the cheaper token bill.
Claude Sonnet 4.5 is clearly ahead on the aggregate, 69 to 39. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Sonnet 4.5's sharpest advantage is in knowledge, where it averages 71.2 against 23.8. The single biggest benchmark swing on the page is MMLU-Pro, 84% to 20.0%.
Claude Sonnet 4.5 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for LFM2.5-350M. That is roughly Infinityx on output cost alone. Claude Sonnet 4.5 gives you the larger context window at 200K, compared with 32K for LFM2.5-350M.
BenchLM keeps the benchmark table and the operator tradeoffs on the same page so a better score does not hide a materially slower, pricier, or smaller-context model.
Runtime metrics show N/A when BenchLM does not have a sourced snapshot for that exact model. The scoring rules and freshness policy are documented on the methodology page.
| Benchmark | Claude Sonnet 4.5 | LFM2.5-350M |
|---|---|---|
| Agentic | ||
| Terminal-Bench 2.0 | 50% | — |
| BrowseComp | 74% | — |
| OSWorld-Verified | 61.4% | — |
| Coding | ||
| HumanEval | 87% | — |
| SWE-bench Verified | 77.2% | — |
| LiveCodeBench | 53% | — |
| SWE-bench Pro | 60% | — |
| SWE-Rebench | 60% | — |
| Multimodal & Grounded | ||
| MMMU-Pro | 95% | — |
| OfficeQA Pro | 87% | — |
| Reasoning | ||
| MuSR | 89% | — |
| BBH | 88% | — |
| LongBench v2 | 82% | — |
| MRCRv2 | 81% | — |
| ARC-AGI-2 | 13.6% | — |
| KnowledgeClaude Sonnet 4.5 wins | ||
| MMLU | 95% | — |
| GPQA | 83.4% | 30.6% |
| SuperGPQA | 91% | — |
| MMLU-Pro | 84% | 20.0% |
| HLE | 21% | — |
| FrontierScience | 84% | — |
| SimpleQA | 91% | — |
| Instruction FollowingClaude Sonnet 4.5 wins | ||
| IFEval | 90% | 77.0% |
| Multilingual | ||
| MGSM | 91% | — |
| MMLU-ProX | 87% | — |
| Mathematics | ||
| AIME 2023 | 97% | — |
| AIME 2024 | 99% | — |
| AIME 2025 | 87% | — |
| HMMT Feb 2023 | 93% | — |
| HMMT Feb 2024 | 95% | — |
| HMMT Feb 2025 | 94% | — |
| BRUMO 2025 | 96% | — |
| MATH-500 | 88% | — |
Claude Sonnet 4.5 is ahead overall, 69 to 39. The biggest single separator in this matchup is MMLU-Pro, where the scores are 84% and 20.0%.
Claude Sonnet 4.5 has the edge for knowledge tasks in this comparison, averaging 71.2 versus 23.8. Inside this category, MMLU-Pro is the benchmark that creates the most daylight between them.
Claude Sonnet 4.5 has the edge for instruction following in this comparison, averaging 90 versus 77. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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