AssemblyAI vs Grok Pricing (2026)
How do these two stack up on price? Here's what each one costs, what you get, and where the value sits.
| AssemblyAI | Grok | |
|---|---|---|
| Starts at | Custom | $30/mo |
| Number of plans | 2 | 2 |
| Free plan | ||
| Free trial | — | |
| Pricing model | usage-based | flat-rate |
Pay as you go
- Universal-3.5 Pro ($0.21/hr)
- Universal-2 ($0.15/hr)
- Universal-3.5 Pro Realtime ($0.45/hr)
- Universal-Streaming ($0.15/hr)
- Universal-Streaming Multilingual ($0.15/hr)
- Sync API ($0.45/hr)
- Voice Agent API ($4.50/hr)
- Speaker Diarization ($0.02/hr pre-recorded, $0.12/hr realtime)
- Medical Mode ($0.15/hr)
- Keyterms Prompting
- Prompting ($0.05/hr)
- Speaker Identification ($0.02/hr)
- Translation ($0.06/hr)
- Custom Formatting ($0.03/hr)
- Entity Detection ($0.08/hr)
- Sentiment Analysis ($0.02/hr)
- Auto Chapters ($0.08/hr)
- Key Phrases ($0.01/hr)
- Topic Detection ($0.15/hr)
- Summarization ($0.03/hr)
- Profanity Filtering ($0.01/hr)
- PII Audio Redaction ($0.05/hr)
- PII Text Redaction ($0.08/hr)
- Content Moderation ($0.15/hr)
- LLM Gateway
- No minimum commitments
- No credit card required to start
Custom
- Custom rate limits
- Enhanced concurrency
- Enterprise-grade flexibility
- Volume-based pricing
- Custom starting concurrency limits
Free
- Real-time web and X search
- Voice mode
- SOC 2 compliance (Type I & II)
- Connectors
SuperGrok
- Grok 4.5 model
- Connectors
- Higher rate limits across all features
- Expert
- SOC 2 compliance (Type I & II)
- Image and video generation
AssemblyAI vs Grok FAQ
- Which one is cheaper?
- One or both use custom pricing, so it depends on your specific needs.
- Can I use either one for free?
- Both offer free plans, so you can try each without paying. Start with whichever fits your workflow better and upgrade when you hit the limits.
- How do they charge?
- Different approach here. AssemblyAI uses usage-based pricing, while Grok goes with flat-rate. That changes the math depending on your team size and usage.
- Which one is a better deal?
- Depends on what you need. AssemblyAI: They're positioning as the developer-friendly, API-first alternative to Deepgram and Rev AI — competitive on price at scale but differentiated by the breadth of AI features (LLM Gateway, multichannel, etc.). The AWS Marketplace listing signals they're actively chasing enterprise procurement budgets. Grok: At $30/mo flat, SuperGrok lands right in line with ChatGPT Plus and other premium AI subscriptions — not trying to undercut on price, just trying to be a credible alternative for people already paying for AI tools. The strategy seems to be 'match the market rate, win on model differentiation,' not 'compete on cost.'
Keep tabs on both.
We'll monitor pricing changes for AssemblyAI and Grok and let you know when something moves.