OpenAI Whisper
Open-source automatic speech recognition system
About OpenAI Whisper
OpenAI Whisper is a general-purpose speech recognition model that has become the gold standard for open-source automatic speech recognition (ASR). Released by OpenAI as open-source software, Whisper was trained on 680,000 hours of multilingual and multitask supervised data collected from the web, making it exceptionally robust to accents, background noise, and technical language. Unlike many commercial ASR systems that require clean audio in specific languages, Whisper can handle real-world audio conditions across 99 languages with impressive accuracy. The model has been widely adopted by developers, researchers, and businesses looking for reliable speech-to-text capabilities without the recurring costs of proprietary APIs.
Whisper is available as a Python package that you install locally or deploy on your own infrastructure. You feed audio files to the model, and it outputs transcriptions along with timestamps for each segment. The model comes in multiple sizes (tiny, base, small, medium, large) allowing you to balance between accuracy and computational requirements based on your use case. For multilingual transcription, Whisper automatically detects the language being spoken. The model can also translate speech from other languages directly into English text. Developers can fine-tune Whisper on domain-specific audio to improve accuracy for specialized vocabularies like medical terminology or technical jargon.
- •Multilingual Recognition - Transcribe speech in 99 languages with high accuracy, automatically detecting the language being spoken without configuration
- •Robust to Noise - Handles real-world audio conditions including background noise, music, multiple speakers, and varied recording quality better than most ASR systems
- •Timestamp Precision - Provides word-level and segment-level timestamps allowing you to sync transcriptions with video or create interactive transcripts
- •Translation to English - Directly translate speech from 99 languages into English text, enabling cross-language communication and content creation
- •Multiple Model Sizes - Choose from five model sizes (tiny to large) to balance accuracy needs with computational constraints and processing speed
- •Open Source and Free - Complete model weights and code available on GitHub under permissive MIT license with no usage fees or API rate limits
Perfect for developers building applications with speech recognition features who need cost-effective, self-hosted transcription capabilities, content creators and podcasters generating transcripts for accessibility and SEO without recurring service fees, and researchers studying speech recognition or building on existing ASR technology. Whisper is also widely used by organizations with data privacy requirements who cannot send audio to external APIs, multilingual businesses needing transcription across many languages without separate models, and anyone experimenting with voice interfaces, transcription workflows, or audio analysis who needs a reliable starting point.
Pricing
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Free and open-source
Checked 2026-09-18
