Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
1-bit Bonsai 4B
~44
0/8 categoriesGPT-5.3 Codex
85
Winner · 4/8 categories1-bit Bonsai 4B· GPT-5.3 Codex
Pick GPT-5.3 Codex 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-5.3 Codex is clearly ahead on the aggregate, 85 to 44. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.3 Codex's sharpest advantage is in reasoning, where it averages 92.5 against 41.4. The single biggest benchmark swing on the page is MATH-500, 65.8% to 99%.
GPT-5.3 Codex is also the more expensive model on tokens at $2.50 input / $10.00 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-5.3 Codex 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-5.3 Codex 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-5.3 Codex |
|---|---|---|
| Agentic | ||
| Terminal-Bench 2.0 | — | 77.3% |
| BrowseComp | — | 88% |
| OSWorld-Verified | — | 64.7% |
| Coding | ||
| SWE-bench Verified | — | 85% |
| LiveCodeBench | — | 85% |
| SWE-bench Pro | — | 56.8% |
| SWE-Rebench | — | 58.2% |
| React Native Evals | — | 80.9% |
| Multimodal & Grounded | ||
| MMMU-Pro | — | 89% |
| OfficeQA Pro | — | 94% |
| ReasoningGPT-5.3 Codex wins | ||
| MuSR | 41.4% | — |
| BBH | — | 98% |
| LongBench v2 | — | 92% |
| MRCRv2 | — | 93% |
| KnowledgeGPT-5.3 Codex wins | ||
| GPQA | 28.7% | — |
| MMLU-Pro | — | 90% |
| HLE | — | 44% |
| FrontierScience | — | 90% |
| SimpleQA | — | 95% |
| Instruction FollowingGPT-5.3 Codex wins | ||
| IFEval | 69.6% | 93% |
| Multilingual | ||
| MGSM | — | 96% |
| MMLU-ProX | — | 91% |
| MathematicsGPT-5.3 Codex wins | ||
| MATH-500 | 65.8% | 99% |
| 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-5.3 Codex is ahead overall, 85 to 44. The biggest single separator in this matchup is MATH-500, where the scores are 65.8% and 99%.
GPT-5.3 Codex has the edge for knowledge tasks in this comparison, averaging 76.9 versus 28.7. 1-bit Bonsai 4B stays close enough that the answer can still flip depending on your workload.
GPT-5.3 Codex has the edge for math in this comparison, averaging 97.6 versus 65.8. Inside this category, MATH-500 is the benchmark that creates the most daylight between them.
GPT-5.3 Codex has the edge for reasoning in this comparison, averaging 92.5 versus 41.4. 1-bit Bonsai 4B stays close enough that the answer can still flip depending on your workload.
GPT-5.3 Codex has the edge for instruction following in this comparison, averaging 93 versus 69.6. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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