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OpenAI vs Supabase
Side-by-side comparison of OpenAI and Supabase.
Quick summary
OpenAI — The company behind ChatGPT, GPT-4o, and o1. OpenAI provides the most widely used LLM API with GPT-4o, GPT-4o mini, o1 reasoning models, embeddings, DALL-E image generation, Whisper speech-to-text, and Assistants API.
Supabase — The open source Firebase alternative. Supabase is an open-source backend-as-a-service built on PostgreSQL. It provides authentication, realtime subscriptions, storage, edge functions, and a hosted database.
Feature comparison
| Feature | OpenAI | Supabase |
|---|---|---|
| Pricing model | Paid | Freemium |
| Starting price | Pay per token | $25/mo |
| Free tier | No | Yes |
| Open source | No | Yes |
| Vision | Yes | — |
| Streaming | Yes | — |
| Embeddings | Yes | — |
| Max Output | 16K | — |
| Fine-tuning | Yes | — |
| Context Window | 128K | — |
| Flagship Model | GPT-4o | — |
| Reasoning Model | o1 | — |
| Function Calling | Yes | — |
| EU Data Residency | Yes | — |
| Auth | — | Yes |
| Storage | — | Yes |
| Database | — | PostgreSQL |
| Realtime | — | Yes |
| Free Tier | — | 500MB DB + 1GB storage |
| Self-hosted | — | Yes |
| Edge Functions | — | Yes |
| Row Level Security | — | Yes |
OpenAI
The company behind ChatGPT, GPT-4o, and o1
Pros
- Most capable general-purpose LLM
- Huge ecosystem and SDK support
- Battle-tested at scale
- Best function calling reliability
Cons
- Most expensive at scale
- No free tier
- Rate limits can bite
- Vendor lock-in risk
Supabase
The open source Firebase alternative
Pros
- Open source and self-hostable
- Standard PostgreSQL — no vendor lock-in
- Generous free tier
- Great DX with auto-generated APIs
Cons
- Cold starts on free tier
- Edge function ecosystem still maturing
Which should you choose?
Choose OpenAI if you need production-grade features and are ready to pay. Choose Supabase if you value open source and want the option to self-host, and a free tier is important for your stage.