Base URLs
| Client style | Base URL |
|---|---|
| OpenAI-compatible clients | https://api.phaseo.ai/v1 |
| Anthropic-compatible clients | https://api.phaseo.ai |
SDKs and direct clients
OpenAI SDK
Use official OpenAI clients with the Phaseo base URL.
Anthropic SDK
Use Anthropic-compatible clients through
/v1/messages.AI SDK
Use the first-party Phaseo provider for the Vercel AI SDK.
LiteLLM
Route LiteLLM traffic through Phaseo or expose Phaseo behind a LiteLLM proxy.
App and agent frameworks
LangChain
Use LangChain Python with
ChatOpenAI and the Phaseo base URL.LlamaIndex
Use Phaseo for RAG and indexing workflows.
PydanticAI
Build typed Python agents against Phaseo.
Mastra
Use Phaseo inside Mastra agents and workflows.
TanStack AI
Connect TanStack AI’s OpenAI-compatible adapter.
Effect AI SDK
Use Phaseo from Effect TypeScript applications.
Coding assistants and observability
Coding Assistants
Add Phaseo as a model provider in Cursor, VS Code, Continue, Aider, Cline, Roo Code, Kilo Code, and related tools.
Claude Code
Route Claude-compatible coding workflows through Phaseo.
Codex
Use Phaseo as a Codex provider.
OpenCode
Configure OpenCode with a custom Phaseo provider.
Observability
Send Phaseo traffic through Langfuse, LangSmith, OpenTelemetry, or similar tooling.
Docs MCP
Add live Phaseo documentation to coding agents and assistants.
Useful defaults
- Set
PHASEO_API_KEYonce and map it to the environment variable expected by the client. - Keep the model id unchanged, for example
openai/gpt-5-nano. - Use
https://api.phaseo.ai/v1for OpenAI-compatible libraries unless the tool explicitly asks for the root host. - Use
https://api.phaseo.aifor Anthropic-compatible SDKs and tools that append/v1/messages. - Test streaming and tool calling in staging before moving agent traffic over.