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docs: add Gemini-2.5-pro-preview vs GPT-4.1 benchmark comparison

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## Gemini-2.5-pro-preview-05-06
### Model 'Gemini-2.5-pro-preview-05-06' vs 'Sonnet 3.7'
### Gemini-2.5-pro-preview-05-06 vs GPT-4.1
![Comparison](https://codium.ai/images/qodo_merge_benchmark/gpt-4.1_vs_gemini-2.5-pro-preview-05-06_judge_o3.png){width=768}
#### Analysis Summary
Model 'Gemini-2.5-pro-preview-05-06' is generally more useful thanks to wider and more accurate bug detection and concrete patches, but it sacrifices compliance discipline and sometimes oversteps the task rules. Model 'GPT-4.1' is safer and highly rule-abiding, yet often too timid—missing many genuine issues and providing limited insight. An ideal reviewer would combine 'GPT-4.1’ restraint with 'Gemini-2.5-pro-preview-05-06' thoroughness.
#### Gemini-2.5-pro-preview-05-06 vs GPT-4.1 - Detailed Analysis
strengths:
- better_bug_coverage: Detects and explains more critical issues, winning in ~70 % of comparisons and achieving a higher average score.
- actionable_fixes: Supplies clear code snippets, correct language labels, and often multiple coherent suggestions per diff.
- deeper_reasoning: Shows stronger grasp of logic, edge cases, and cross-file implications, leading to broader, high-impact reviews.
weaknesses:
- guideline_violations: More prone to over-eager advice—non-critical tweaks, touching unchanged code, suggesting new imports, or minor format errors.
- occasional_overreach: Some fixes are speculative or risky, potentially introducing new bugs.
- redundant_or_duplicate: At times repeats the same point or exceeds the required brevity.
### Gemini-2.5-pro-preview-05-06 vs Sonnet 3.7
![Comparison](https://codium.ai/images/qodo_merge_benchmark/sonnet_37_vs_gemini-2.5-pro-preview-05-06_judge_o3.png){width=768}
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See raw results [here](https://github.com/Codium-ai/pr-agent-settings/blob/main/benchmark/sonnet_37_vs_gemini-2.5-pro-preview-05-06.md)
#### Model 'Gemini-2.5-pro-preview-05-06' vs 'Sonnet 3.7' - Detailed Analysis
#### Gemini-2.5-pro-preview-05-06 vs Sonnet 3.7 - Detailed Analysis
strengths:
@ -32,7 +55,6 @@ weaknesses:
- sporadic_technical_slips: a few patches contain minor coding errors, oversized snippets, or duplicate/contradicting advice.
### Model 'Gemini-2.5-pro-preview-05-06' vs 'GPT-4.1'
[//]: # (On coding tasks, the gap between open-source models and top closed-source models such as Claude and GPT is significant.)