Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
1-bit Bonsai 4B
~44
0/8 categoriesClaude Opus 4.5
78
Winner · 4/8 categories1-bit Bonsai 4B· Claude Opus 4.5
Pick Claude Opus 4.5 if you want the stronger benchmark profile. 1-bit Bonsai 4B only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
Claude Opus 4.5 is clearly ahead on the aggregate, 78 to 44. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Opus 4.5's sharpest advantage is in knowledge, where it averages 71.7 against 28.7. The single biggest benchmark swing on the page is GPQA, 28.7% to 87%.
Claude Opus 4.5 gives you the larger context window at 200K, compared with 32K for 1-bit Bonsai 4B.
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 | 1-bit Bonsai 4B | Claude Opus 4.5 |
|---|---|---|
| Agentic | ||
| Terminal-Bench 2.0 | — | 59.3% |
| BrowseComp | — | 73% |
| OSWorld-Verified | — | 68% |
| Coding | ||
| HumanEval | — | 91% |
| SWE-bench Verified | — | 80.9% |
| LiveCodeBench | — | 57% |
| SWE-bench Pro | — | 62% |
| Multimodal & Grounded | ||
| MMMU-Pro | — | 94% |
| OfficeQA Pro | — | 87% |
| ReasoningClaude Opus 4.5 wins | ||
| MuSR | 41.4% | 93% |
| BBH | — | 87% |
| LongBench v2 | — | 82% |
| MRCRv2 | — | 81% |
| ARC-AGI-2 | — | 37.6% |
| KnowledgeClaude Opus 4.5 wins | ||
| GPQA | 28.7% | 87% |
| MMLU | — | 90.8% |
| SuperGPQA | — | 95% |
| MMLU-Pro | — | 81% |
| HLE | — | 20% |
| FrontierScience | — | 84% |
| SimpleQA | — | 95% |
| Instruction FollowingClaude Opus 4.5 wins | ||
| IFEval | 69.6% | 90% |
| Multilingual | ||
| MGSM | — | 90% |
| MMLU-ProX | — | 84% |
| MathematicsClaude Opus 4.5 wins | ||
| MATH-500 | 65.8% | 89% |
| AIME 2023 | — | 99% |
| AIME 2024 | — | 99% |
| AIME 2025 | — | 98% |
| HMMT Feb 2023 | — | 95% |
| HMMT Feb 2024 | — | 97% |
| HMMT Feb 2025 | — | 96% |
| BRUMO 2025 | — | 96% |
Claude Opus 4.5 is ahead overall, 78 to 44. The biggest single separator in this matchup is GPQA, where the scores are 28.7% and 87%.
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 71.7 versus 28.7. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for math in this comparison, averaging 95.1 versus 65.8. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 72.9 versus 41.4. Inside this category, MuSR is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for instruction following in this comparison, averaging 90 versus 69.6. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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