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Show HN: Superwhisper S1 mini – Text and tone normalizer for speech-to-text

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S1-mini-GGUF by Superwhisper is a compact, purpose-built text normalizer for post-processing speech-to-text transcripts. It rewrites raw ASR output into clean written text by removing fillers, resolving false starts and self-corrections to the final spoken choice, applying punctuation and capitalization, and converting spoken entities (numbers, dates, times, currency, email addresses) into written form. English-only and not a conversational/chat model, it is steered via a required control line and system prompt that specify styling, structure, and context. Intended for integration into dictation or transcription apps (check the included s1-mini-license), it runs comfortably on a laptop CPU and achieved 94.8% token accuracy on a held-out set of 7,519 English cases.

Two GGUF builds are provided: a Q4_K_M quantized build (recommended) at 462 MiB and an F16 unquantized build at 1.4 GB. Internally it uses a qwen3-style skeleton with 311 tensors, 28 blocks, a 40,960-token context window, and an embedded chat template; quantization keeps 29 tensors at Q6_K while the bulk is Q4_K and normalization params remain F32. The repo includes usage instructions for many runtimes and servers - llama.cpp, vLLM, Docker, Ollama, LM Studio and others - plus deployable examples and notes on files, input format, and evaluation details.

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