Dev uses Haiku 5.5 for in-app chat: users thought it was Opus
EXM7777 · x · 2026-10-14
Developer EXM7777 shares that he uses Claude Haiku 5.5 to power fast, enjoyable in-app chat for his customers. For this use case it clearly beats DeepSeek V4.1 Flash and GLM-5.3 Flash, delivering a Claude-like feel at a fraction of the cost — some users even guessed the backend was Opus. He credits good context management and prompt engineering for the results.
Related event: Dev Test: Haiku 5.5 Beats DeepSeek and GLM Flash for In-App Chat(2 posts)→
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