AssemblyAI vs OpenAI 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 | OpenAI | |
|---|---|---|
| Starts at | Custom | $8/mo |
| Number of plans | 2 | 4 |
| 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
- Unlimited text chats with GPT-5.6 Luna
- Limited messages with uploads
- Limited and slower image generation
- Limited voice chats
- Limited deep research
- Limited memory and context
- Limited Codex access
- Limited ChatGPT Work access on desktop
Go
- More messages with tools
- More uploads
- More image creation
- More voice chats
- Longer memory
Plus
- Advanced reasoning models with GPT-5.6
- Expanded messages and uploads
- More complex and accurate image creation
- Expanded deep research
- Expanded memory and context
- Projects, scheduled tasks, and custom GPTs
- Expanded Codex usage
- Expanded access to ChatGPT Work on desktop, web, and mobile
- Early access to new features
Pro
- 5x or 20x more usage
- Pro reasoning with GPT-5.6 Sol Pro
- Maximum Codex tasks
- Unlimited and faster image creation
- Maximum deep research
- Maximum memory and context
- Expanded projects, tasks, and custom GPTs
- Research preview of new features
AssemblyAI vs OpenAI 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 OpenAI 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. OpenAI: They're straddling both ends — Go undercuts everyone as a low-commitment tier competing with free-tier fatigue, while Pro sits at premium territory compared to Anthropic's Claude Pro ($20) or Gemini Advanced, betting power users will pay 5x for frontier model access. It's not a clean 'cheap' or 'premium' play — it's a ladder designed to capture willingness-to-pay across a huge range.
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