Matchup
Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017
2 posts35 likes8.9K views
Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017 in real side-by-side tests: 2 posts from X where both got the same prompt; 1 post reports cost or time. Judge coding ability from the actual outputs.
Posts
2
Same prompt, separate runs
4Not a controlled comparison: prompts, tools and time differ.
Summary
Claude Sonnet 5.5 and DeepSeek V4.1 Flash 1017 appear together in 2 posts on X: realistic Tokyo Tower, with fix counts (@seki_anos) and booster caught by the launch tower (@adamshafizullah). 1 of them are part of larger lineups with other models. In @seki_anos's realistic Tokyo Tower, with fix counts, DeepSeek V4.1 Flash 1017 was cheaper ($1.30 vs $6.79) and Claude Sonnet 5.5 was faster (1 h 10 min vs 3 h 40 min), as reported in the post.
What each post reports
| Post | Model | Time | Cost | Tokens | Feedback rounds | Original |
|---|---|---|---|---|---|---|
| Realistic Tokyo Tower, with fix counts@seki_anos | DeepSeek V4.1 Flash 1017 | 3 h 40 min | $1.30 | — | 19 | X post |
| Realistic Tokyo Tower, with fix counts@seki_anos | Claude Sonnet 5.5 | 1 h 10 min | $6.79 | — | 11 | X post |
| Booster caught by the launch tower@adamshafizullah | DeepSeek V4.1 Flash 1017 | — | — | — | — | X post |
| Booster caught by the launch tower@adamshafizullah | Claude Sonnet 5.5 | — | — | — | — | X post |
Only numbers stated in each post. “—” means the post doesn’t say.
Prompts shown in the posts
Build the Tokyo Tower in Three.js so it looks just like the real thing. (Translated from Japanese.) — @seki_anos
Models
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