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Claude Sonnet 5.5 vs GPT-6 Astra

1 website built from the same prompts — one by each model, nothing added. Compare real results side by side, then copy the prompt and try it in your own tool.

Claude Sonnet 5.5Anthropic · 36 sites · Claude Code, CursorGPT-6 AstraOpenAI · 6 sites · Codex

Templates built by both models

  1. Solar System 3D Explainer

    Pro prompt →
    Solar System 3D Explainer built with Claude Sonnet 5.5Claude Sonnet 5.5

    Claude Sonnet 5.5: A red dwarf's seven planets · Claude Code

    Solar System 3D Explainer built with GPT-6 AstraGPT-6 Astra

    GPT-6 Astra: The Solar System · Codex

FAQ

Claude Sonnet 5.5 vs GPT-6 Astra

Claude Sonnet 5.5 vs GPT-6 Astra: which is better for building websites?

It depends on the site. Here are 1 template where both models built the same prompt — mostly interactive explainer (1) — so you can compare real results instead of benchmarks. Open any pair to try both live demos.

Claude Sonnet 5.5 or GPT-6 Astra for 3D websites?

1 of the shared templates uses 3D / WebGL: Solar System 3D Explainer. Both builds of each are live, so compare how each model handled the scene, performance and mobile layout.

Claude Sonnet 5.5 or GPT-6 Astra: which writes bigger projects?

On these 1 prompt, Claude Sonnet 5.5's builds shipped a median of 14 files and GPT-6 Astra's 16. More files is not better or worse on its own — open the demos and compare.

Which coding tools ran Claude Sonnet 5.5 and GPT-6 Astra?

Claude Sonnet 5.5 ran in Claude Code; GPT-6 Astra ran in Codex. The prompt text was identical.

Did Claude Sonnet 5.5 and GPT-6 Astra really get the same prompt?

Yes. For each template, Claude Sonnet 5.5 and GPT-6 Astra got the same published prompt, with nothing added. Each build fills the [VARIABLES] (brand name, copy) with its own values, so the content differs while the brief stays the same.

Can I run the Claude Sonnet 5.5 vs GPT-6 Astra prompts myself?

Yes. Every template in this Claude Sonnet 5.5 vs GPT-6 Astra comparison has its full prompt on its template page (Pro templates show it to Pro members). Paste it into your AI coding tool with your own values and compare your result with both demos.