Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
1-bit Bonsai 4B
~44
0/8 categoriesGPT-5.1-Codex-Max
81
Winner · 4/8 categories1-bit Bonsai 4B· GPT-5.1-Codex-Max
Pick GPT-5.1-Codex-Max if you want the stronger benchmark profile. 1-bit Bonsai 4B only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
GPT-5.1-Codex-Max is clearly ahead on the aggregate, 81 to 44. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.1-Codex-Max's sharpest advantage is in reasoning, where it averages 91.5 against 41.4. The single biggest benchmark swing on the page is GPQA, 28.7% to 96%.
GPT-5.1-Codex-Max is also the more expensive model on tokens at $2.00 input / $8.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for 1-bit Bonsai 4B. That is roughly Infinityx on output cost alone. GPT-5.1-Codex-Max is the reasoning model in the pair, while 1-bit Bonsai 4B 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. GPT-5.1-Codex-Max gives you the larger context window at 400K, 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 | GPT-5.1-Codex-Max |
|---|---|---|
| Agentic | ||
| Terminal-Bench 2.0 | — | 90% |
| BrowseComp | — | 85% |
| OSWorld-Verified | — | 82% |
| Coding | ||
| HumanEval | — | 94% |
| SWE-bench Verified | — | 77.9% |
| LiveCodeBench | — | 67% |
| SWE-bench Pro | — | 84% |
| Multimodal & Grounded | ||
| MMMU-Pro | — | 85% |
| OfficeQA Pro | — | 92% |
| ReasoningGPT-5.1-Codex-Max wins | ||
| MuSR | 41.4% | 92% |
| BBH | — | 92% |
| LongBench v2 | — | 90% |
| MRCRv2 | — | 93% |
| KnowledgeGPT-5.1-Codex-Max wins | ||
| GPQA | 28.7% | 96% |
| MMLU | — | 98% |
| SuperGPQA | — | 94% |
| MMLU-Pro | — | 82% |
| HLE | — | 27% |
| FrontierScience | — | 84% |
| SimpleQA | — | 94% |
| Instruction FollowingGPT-5.1-Codex-Max wins | ||
| IFEval | 69.6% | 91% |
| Multilingual | ||
| MGSM | — | 89% |
| MMLU-ProX | — | 87% |
| MathematicsGPT-5.1-Codex-Max wins | ||
| MATH-500 | 65.8% | 93% |
| AIME 2023 | — | 99% |
| AIME 2024 | — | 99% |
| AIME 2025 | — | 98% |
| HMMT Feb 2023 | — | 95% |
| HMMT Feb 2024 | — | 97% |
| HMMT Feb 2025 | — | 96% |
| BRUMO 2025 | — | 96% |
GPT-5.1-Codex-Max is ahead overall, 81 to 44. The biggest single separator in this matchup is GPQA, where the scores are 28.7% and 96%.
GPT-5.1-Codex-Max has the edge for knowledge tasks in this comparison, averaging 74.4 versus 28.7. Inside this category, GPQA is the benchmark that creates the most daylight between them.
GPT-5.1-Codex-Max has the edge for math in this comparison, averaging 96.1 versus 65.8. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
GPT-5.1-Codex-Max has the edge for reasoning in this comparison, averaging 91.5 versus 41.4. Inside this category, MuSR is the benchmark that creates the most daylight between them.
GPT-5.1-Codex-Max has the edge for instruction following in this comparison, averaging 91 versus 69.6. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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