What is OsirisBrain?
OsirisBrain is a single frontier reasoning model that is fully compatible with the OpenAI API. You get one endpoint, one intelligence, and no need to pick between different models. It works with tools like opencode, Codex, or Cursor, so you can plug it into your existing stack with minimal changes.
To start, you create an account and receive welcome credits to try it without commitment. Then you get an API key in the format sk-osiris-... and point your client to the endpoint https://app.osirisbrain.com/v1. You can call it like any OpenAI model, using the same /v1/chat/completions endpoint, tool-calling, and streaming.
You pay only for the tokens you actually use, with no subscription or minimum. You can top up your balance anytime, and your consumption and balance are always visible in your dashboard. The site mentions pricing plans starting at $5, with a Pro option at $20 and custom enterprise plans, but it does not detail exact token rates.
OsirisBrain features
- OpenAI compatibility: Use the same API and code as OpenAI, just change your base URL.
- Single endpoint: One API gives you frontier-level intelligence without managing multiple providers.
- Tool-calling support: Works with function calls and tools for complex workflows.
- Pay-as-you-go: No subscription or minimum; you pay per token and can top up anytime.
- Real-time usage panel: See your consumption and balance clearly in your dashboard.
What you can do with OsirisBrain
- Build coding agents that reason and write code with tool use.
- Connect to opencode or Codex for AI-assisted development.
- Create custom chatbots or assistants using the OpenAI-compatible API.
- Run automated workflows that need streaming responses and tool calls.
How to get started with OsirisBrain
- Create an account on OsirisBrain's website and get welcome credits.
- Get your API key, which starts with sk-osiris-.
- Point your client like opencode, Codex, or curl to the endpoint and start building.
Tips for better results with OsirisBrain
- Point your OpenAI-compatible client to https://app.osirisbrain.com/v1 and use the model name osirisbrain-coder to start calling OsirisBrain with your existing code.
- Use OsirisBrain with opencode, Codex, or Cursor by changing only the base URL and API key, so you can test it in your current workflow without rewriting anything.
- Take advantage of OsirisBrain's tool-calling support by setting up function calls for complex tasks like coding agents, and verify streaming works for your use case.
- Monitor your token consumption and balance in the OsirisBrain dashboard after each session, so you know exactly what you spend and can top up before you run out.
OsirisBrain pricing
OsirisBrain has a free way to start, with paid plans for heavier use. Check osirisbrain.com for current limits and prices.
What to check before you rely on OsirisBrain
- Check whether the website lists exact token rates for OsirisBrain; it only shows plan prices at $5 and $20, so per-token costs are not stated.
- Verify that your client sends the model name osirisbrain-coder, since the site's example uses it, but confirm it matches the current API documentation.
- Confirm data handling and privacy policies for OsirisBrain before using it on sensitive work, as the site does not detail how your prompts or outputs are stored.
Who OsirisBrain is for
OsirisBrain suits developers, AI startups and coding tool users. If that is not you, the AI developer platforms below may fit better.
Similar tools compared with OsirisBrain
| Tool | What it is | Pricing |
|---|---|---|
| OsirisBrain | OpenAI-compatible frontier reasoning API | Freemium |
| SiVideoAPI | Unified API for top AI video models | Freemium |
| OpenSI | AI model comparison and pricing tool | See website |
| OpenRouter | Unified API for many AI models | Freemium |
| Ollama | Run open models locally or cloud | Freemium |
OsirisBrain FAQ
What is OsirisBrain?
OsirisBrain is a single frontier reasoning model that is 100% compatible with the OpenAI API. It provides one endpoint for chat completions, tool-calling, and streaming, so you can use it as a drop-in replacement for OpenAI models.
How does pricing work?
You pay only for what you use, with no subscription or minimum. You can top up your balance, and there are starter plans like $5 and $20. The site does not state specific token prices, so check the pricing page for details.
Who is OsirisBrain for?
It's for developers and teams who want a single, powerful AI model without managing multiple providers. It suits those using coding tools like opencode, Codex, or Cursor, and anyone building on the OpenAI API.
Can I use it with my existing OpenAI code?
Yes. You just change your base URL to https://app.osirisbrain.com/v1 and use your API key. The API is the same as OpenAI's, so you don't need to migrate your code.
Does OsirisBrain offer a free plan or only paid credits?
OsirisBrain is freemium. When you create an account, you receive welcome credits to try it without commitment. The site does not specify a separate free plan beyond those credits. After that, you pay per token with no subscription or minimum, starting at $5 for the Starter plan.
Can OsirisBrain export data or connect to external services beyond OpenAI-compatible tools?
OsirisBrain connects to OpenAI-compatible clients like opencode, Codex, or Cursor, and works with the /v1/chat/completions endpoint, tool-calling, and streaming. The website does not mention any other export formats or integrations with external services beyond these. Check the Docs section for more details.
Which devices or platforms does OsirisBrain run on?
OsirisBrain is an API-based service, so it runs on any device or platform that can make HTTPS requests, such as servers, desktops, or cloud environments. You access it via a base URL and API key, with no installation required. The website does not list specific device or OS requirements.
