Best LLMs for Data Analysis in 2025
From interpreting statistical results to writing Python pandas code, we compare the top models for data science and analytical workflows.
Key Takeaways
| Takeaway | Details |
|---|---|
| Top Models | OpenAI o4-mini excels at quantitative reasoning while Claude 3.5 Sonnet leads in mixed code and explanation tasks. |
| Context Window | Gemini 2.5 Pro offers 1M token context for analyzing large schemas and extensive Jupyter notebooks. |
| Code Execution | ChatGPT's Advanced Data Analysis feature executes Python and iterates on code until producing correct output. |
| Production Pipelines | Claude 3.5 Sonnet or GPT-4o are recommended for automated data pipeline code generation. |
| Prompt Strategy | Include schema definitions, sample data rows, and example queries for dramatically better code generation. |
What Data Analysis Requires from an LLM
Data analysis with LLMs spans several distinct capabilities. These include writing data manipulation code in Python, SQL, and R, interpreting statistical outputs and charts, reasoning about causal relationships, generating visualizations, and explaining findings to non-technical audiences.
The ideal data analysis model combines strong coding ability, quantitative reasoning, and the ability to work with large amounts of context including dataset schemas, multiple code snippets, and analytical outputs simultaneously.
Top Models for Data Analysis
OpenAI o4-mini stands out for quantitative reasoning. Its extended Chain of Thought processing is genuinely useful for statistical interpretation, debugging unexpected results, and reasoning about data distributions. Claude 3.5 Sonnet is the best for mixed code and explanation tasks, producing clean analytical code alongside clear prose explanations.
Gemini 2.5 Pro deserves mention for its 1M token context window. It enables analysis of very large schemas, multiple tables, or extensive Jupyter notebooks in a single prompt. For SQL generation specifically, both Claude and GPT-4o are excellent.
Code Execution Changes Everything
ChatGPT's Advanced Data Analysis feature, which executes Python and returns actual charts, is a significant differentiator for exploratory data work. The model can iterate on its code in a loop until it produces the correct output. This is impossible without execution feedback.
When comparing models purely as APIs for data analysis pipelines, execution-augmented models and non-execution models are incomparable. For automated data pipelines, a well-prompted Claude or GPT-4o generating code that you then execute in your own environment is the standard pattern.
Recommendation
For exploratory data analysis and business intelligence, use ChatGPT with Advanced Data Analysis or Claude through Claude.ai for mixed code and prose workflows. For production data pipelines, Claude 3.5 Sonnet or GPT-4o is your best primary code generation model. For hard quantitative reasoning, use o4-mini for its structured problem-solving approach.
Include schema definitions, sample data rows, and example queries in your prompt for dramatically better SQL and pandas code generation. The more context you provide about your data structure, the better the model performs.
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