Claude Sonnet 4.5 vs Opus 4.1 Coding Test | Which is the Best Coding Model?

2025-12-02 20:358 min read

In this video, the presenter compares the newly launched Claude Sonet 4.5 model with Claude Opus 4.1 for coding tasks. The video discusses various coding prompts including HTML, CSS, and JavaScript problems, showcasing their outputs using both models. While Sonet 4.5 demonstrates customizable options and better visual outputs, Opus 4.1 is noted for handling complex prompts effectively. The presenter explores different projects including simulating falling leaves, birds in flight, and animations of planets revolving around the sun. The conclusion suggests that both models perform well, although Sonet 4.5 tends to excel in specific tasks, and encourages viewers to share their thoughts on the models.

Key Information

  • The video compares the newly launched Claude Sonet 4.5 model with the Claude Opus 4.1 model, specifically focusing on coding prompts.
  • The presenter uses various HTML, CSS, and JavaScript prompts to evaluate the performance of both models in generating code.
  • The first prompt involves creating JavaScript code to simulate leaves falling from a tree, with Sonet 4.5 praised for its output and additional controls.
  • Claude Opus 4.1 also performs decently, producing a response with a tree visually populated with leaves, though it has a few visual discrepancies.
  • The presenter highlights the differences in control options between both models, noting that Opus 4.1 provides more customizable features.
  • The second prompt challenges both models to create a big bird using HTML, with Sonet 4.5 performing well overall but Opus 4.1 excelling in this task.
  • Next, the presenter simulates the movement of planets around the sun; however, both models fail to generate realistic orbital physics in their outputs.
  • Finally, the presenter concludes that while both models perform well in general, there are areas where one might outperform the other depending on the prompt.

Timeline Analysis

Content Keywords

Claude Models Comparison

The video compares the newly launched Claude models, specifically Claude Sonet 4.5 and Claude Opus 4.1, focusing on their coding capabilities and the outputs they produce for HTML, CSS, and JavaScript prompts.

HTML, CSS, JavaScript Prompts

The presenter discusses several coding prompts, including simulating falling leaves with various shapes and colors using HTML, CSS, and JavaScript.

Output Evaluation

The video showcases outputs generated by both Claude models for given prompts, emphasizing user interaction with visual elements like leaf controls and calculator features in opuses.

Performance Metrics

Performance metrics from the models are shown, with specific feedback on their ability to generate a bird's HTML representation and simulate planet movements around the sun.

Complex Coding Problems

Towards the end, the presenter addresses challenging coding problems, featuring prompts with low acceptance rates and high complexity, comparing model performance under these conditions.

Overall Model Performance

The conclusion drawn reflects the comparable performance of both models, with mention of when one may outperform the other depending on the complexity of prompts.

Plant and Wildlife Simulations

The video includes features that allow simulating interactions between elements (plants, wind, etc.) and discusses how these contribute to the overall user experience in the coding context.

Interactive Features

User interaction is highlighted through features like adjusting gravity, wind forces, and speed controls during simulations, aiming to provide a dynamic programming experience.

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