The “best” transcription API depends on what matters most: accuracy, real-time latency, diarization, speaker labels, punctuation, cost, or ease of integration. For meetings and live captions, these are the top choices right now:

Best overall for meetings + live captions

Deepgram

• Very strong real-time streaming performance
• Good speaker diarization
• Low latency for live captions
• Easy API for both streaming and batch
• Competitive pricing

Best if: you need fast, reliable live captions and meeting transcription at scale.

Best for transcription quality

OpenAI Whisper API

• Excellent accuracy, especially on noisy audio and varied accents
• Great for post-meeting transcription
• Less ideal for true low-latency live captioning compared to dedicated streaming APIs

Best if: accuracy matters more than real-time speed.

Best enterprise option

AssemblyAI

• Strong transcription features
• Good speaker labels, summaries, and other meeting-oriented tools
• Nice developer experience
• Good for production workflows

Best if: you want a polished product with meeting-friendly features.

Best cloud-platform option

Google Speech-to-Text

• Reliable and scalable
• Good streaming support
• Works well if you already use Google Cloud

Best if: you’re already on GCP or want a standard enterprise cloud option.

Best AWS-native option

Amazon Transcribe

• Solid streaming transcription
• Easy if your stack is on AWS
• Useful enterprise integrations

Best if: you’re already in AWS and want native integration.

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My practical recommendation

If you want the best API for both meetings and live captions

Start with Deepgram.

If you care most about accuracy for recorded meetings

Use Whisper API for post-processing.

If you need a more “meeting product” feel with extras

AssemblyAI is a strong choice.

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Quick feature comparison

Provider	Live captions	Accuracy	Speaker diarization	Ease of use	Best use case
Deepgram	Excellent	Very good	Yes	Easy	Real-time meetings
Whisper API	Good for near-real-time, best for batch	Excellent	Limited via pipeline	Easy	Recorded meetings
AssemblyAI	Very good	Very good	Yes	Easy	Meeting apps
Google STT	Very good	Very good	Yes	Moderate	Enterprise streaming
Amazon Transcribe	Very good	Good–very good	Yes	Moderate	AWS-based apps

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A few selection tips

Choose based on:

• Need live captions with low lag? → Deepgram
• Need highest transcription quality? → Whisper API
• Need analytics/summaries/speaker tools? → AssemblyAI
• Need cloud-native integration? → Google/AWS

If you want, I can also give you:

1. a cost comparison,
2. a sample architecture for live meeting captions, or
3. a recommendation based on your stack (Zoom/Teams/WebRTC, AWS/GCP, etc.).