OpenAI-compatible API
A single REST endpoint with streaming, built to the interface your engineers already know. No new SDKs, no new protocols.
LLM API Endpoint
OpenAI-compatible API · pay per token
An API just like OpenAI's or Claude's — for open-source models.
One familiar endpoint serving open-source models with stable shared performance. Agentic infrastructure for tool use and function calling is included. Billed per token.
Overview
A familiar API, powered by open-source models
LLM API Endpoint is a shared API service that serves open-source large language models through the same interface as major model providers like OpenAI and Anthropic. No infrastructure to manage — billed per token.
Open-source models
Leading open-weight models served through the same endpoint. Model additions and version updates are handled by Tara Cloud.
Stable shared performance
The endpoint runs on shared infrastructure with stable shared performance — no capacity planning on your side.
Per-token billing
Billed per token, exactly as with the large proprietary APIs — no GPUs to provision, no idle time to pay for.
Agentic infrastructure
Built for agents, not just chat
More than text generation. The endpoint ships with the infrastructure needed for agentic applications — models that call tools and complete multi-step tasks.
Tool use
The model calls your internal tools and APIs; your application runs them and returns the structured results to the model.
Function calling
Declare functions with typed signatures; the model responds with structured calls your code can execute.
Agent runtimes
Long-running agent loops with state, scheduling, and handoffs — supported out of the box.
Frontier models
Official OpenAI and Anthropic models, one JPY invoice
The official frontier models from the major providers are available through the same Tara Cloud account — consolidated into a single monthly invoice in Japanese yen.
Please note
Closed-source model inference may occur outside Japan
OpenAI and Anthropic models are served through each vendor's official API, which may run inference outside Japan. Before using closed-source models, please review each vendor's terms for how your data is handled.
Official vendors, official APIs
OpenAI and Anthropic models are served through each vendor's official API, exactly as published.
One JPY invoice
All usage is consolidated by Tara Cloud into a single monthly invoice in Japanese yen.
One account, one integration
Mix open-source and frontier models behind a single API integration.
Who it's for
For every team that needs a production API now
LLM API Endpoint is for teams that want a production-grade model API without standing up infrastructure — from a single integration to enterprise scale.
Customer-facing assistants
Chat and copilot experiences in production — in weeks, not months.
Agentic workflows
Applications that call tools, search internal systems, and complete multi-step plans.
Batch and extraction
Summaries, classification, and structured extraction at scale, billed per token.
Start building on a production API
Tell us about the models you need, your applications, and your expected workloads. We will respond within one business day with next steps and a technical walkthrough.