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Claude Opus 5.5 vs DeepSeek V4.1 Flash

10 websites 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 Opus 5.5Anthropic · 53 sites · Claude Code, CursorDeepSeek V4.1 FlashDeepSeek · 97 sites · DeepSeek Harness

Templates built by both models

  1. Physics Playground Landing Page

    Copy the prompt →
    Physics Playground Landing Page built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Collaborative design canvas · Claude Code

    Physics Playground Landing Page built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Collaborative design canvas · DeepSeek Harness

  2. Isometric 3D Room Portfolio

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    Isometric 3D Room Portfolio built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Creative front-end developer · Claude Code

    Isometric 3D Room Portfolio built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Creative front-end developer · DeepSeek Harness

  3. Interactive 3D Globe Travel Journal

    Pro prompt →
    Interactive 3D Globe Travel Journal built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Overland travel writer · Cursor

    Interactive 3D Globe Travel Journal built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Overland travel writer · DeepSeek Harness

  4. Compound Interest Interactive Explainer

    Copy the prompt →
    Compound Interest Interactive Explainer built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Personal finance newsletter · Claude Code

    Compound Interest Interactive Explainer built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Personal finance newsletter · DeepSeek Harness

  5. AI Image Generator Landing Page

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    AI Image Generator Landing Page built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: AI image generator app · Claude Code

    AI Image Generator Landing Page built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: AI image generator app · DeepSeek Harness

  6. Cinematic Scroll Product Story

    Pro prompt →
    Cinematic Scroll Product Story built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Electric commuter bike · Claude Code

    Cinematic Scroll Product Story built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Electric commuter bike · DeepSeek Harness

  7. How Large Language Models Work

    Pro prompt →
    How Large Language Models Work built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Next-word prediction · Claude Code

    How Large Language Models Work built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Next-word prediction · DeepSeek Harness

  8. WebGL Gradient SaaS Landing Page

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    WebGL Gradient SaaS Landing Page built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Finance close software · Claude Code

    WebGL Gradient SaaS Landing Page built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Finance close software · DeepSeek Harness

  9. Dark Developer Tool Launch Page

    Copy the prompt →
    Dark Developer Tool Launch Page built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Code review CLI · Claude Code

    Dark Developer Tool Launch Page built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Code review CLI · DeepSeek Harness

  10. AI Agent Startup Landing Page

    Pro prompt →
    AI Agent Startup Landing Page built with Claude Opus 5.5Claude Opus 5.5

    Claude Opus 5.5: Support ops agents · Claude Code

    AI Agent Startup Landing Page built with DeepSeek V4.1 FlashDeepSeek V4.1 Flash

    DeepSeek V4.1 Flash: Support ops agents · DeepSeek Harness

FAQ

Claude Opus 5.5 vs DeepSeek V4.1 Flash

Claude Opus 5.5 vs DeepSeek V4.1 Flash: which is better for building websites?

It depends on the site. Here are 10 templates where both models built the same prompt, so you can compare real results instead of benchmarks. Open any pair to try both live demos.

Were both sites really built from the same prompt?

Yes. For each template, Claude Opus 5.5 and DeepSeek V4.1 Flash 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 same prompt myself?

Yes. Every template page has the full prompt (Pro templates show it to Pro members). Paste it into your AI coding tool with your own values.