Capabilities Security Direct Use Cases API Access Casturi Studio Startup Program Plans FAQ
Request access Log in
100% OpenAI Ready API Made in India

India's own
LLM.

State-of-the-art general intelligence, step-by-step reasoning, complete repo engineering, and autonomous multi-tool agent execution — built and hosted in India at a fraction of the cost of frontier models.

Building a product? View OpenAI API integration or claim 100M Free Startup Tokens.

90%Cost reduction vs frontier
100%OpenAI endpoint ready
24×7Hosted natively in India
100MFree Startup Tokens
Casturi Neural Flow Engine ● Live Routing
User Query
Casturi Core
Agent Tools
Casturi AI Chat UI Screenshot
Capabilities

General intelligence built for demanding work.

Casturi is a general-purpose frontier LLM engineered for step-by-step reasoning, complex coding, tool synthesis, and enterprise-grade workloads.

Software Engineering

Generation, refactoring, debugging, migration, and architecture review with entire codebase contexts — not just single functions.

Step-by-step reasoning

Works through multi-constraint logic, quantitative modeling, and edge cases systematically before producing the output.

Autonomous Tool Calling

Invokes custom APIs, runs Python execution sandboxes, performs live web browsing, and recovers gracefully from unexpected schema returns.

Multimodal Documents & Data

Parses financial reports, complex spreadsheets, architectural diagrams, screenshots, and OCR documents directly into actionable insights.

Structured JSON Output

Guaranteed schema adherence and deterministic JSON mode, ready to plug straight into high-frequency backend API pipelines.

Data Sovereignty & Privacy

Trained, fine-tuned, and served strictly on domestic Indian cloud infrastructure. Prompts never traverse foreign API endpoints.

Security & Data Privacy

Your prompts stay yours. Always.

Casturi is built and hosted on Indian infrastructure with a strict data boundary: nothing you send is ever used to train a public model, and nothing leaves the platform without your action.

🇮🇳 Hosted in India 🔒 TLS in transit 🚫 No training on your prompts 📝 Admin audit trail
  • Zero training on your data. Chats and API traffic are never used to train Casturi or any third-party model.
  • Invite-gated access. Every account, including Google sign-in, requires a valid invite — no open sign-up surface to abuse.
  • Encrypted end to end. HTTPS/TLS on every connection; credentials and secrets are encrypted at rest.
  • Full audit trail. Every admin action — invites, plan changes, access grants — is logged and reviewable.
Direct Use Cases & Efficiency

Frontier LLM Performance at a Fraction of the Cost.

Why spend \$20+ per million tokens on international frontier models? Casturi delivers 90%+ cost savings with sub-second response latency and full API compatibility.

Cost Comparison Benchmark

Save up to 90% on Token API Spend

Scale production API workloads and agent fleets without burning your runway.

✓ 100% OpenAI Drop-In Integration
Frontier Models (GPT-4o / Claude 3.5)\$15.00 / 1M tokens
Casturi LLM (Host in India)\$0.90 / 1M tokens
Engineering

Automated PR Review & Refactoring

Hook Casturi directly into your CI/CD pipelines to review code diffs, flag security vulnerabilities, and generate test suites automatically.

Agentic AI

Autonomous AI Agent Workflows

Deploy agentic assistants capable of browsing the web, calling external microservices, executing python scripts, and completing multi-step tasks.

Documents

Multimodal Financial & Data Extraction

Extract tabular data, invoices, tax filings, and complex technical diagrams into structured databases instantly at pennies per thousand pages.

API Integration

High-Throughput Microservice Backend

Power real-time customer applications, chatbots, and recommendation engines with deterministic JSON output and guaranteed uptime.

Enterprise RAG

Sovereign Knowledge Retrieval

Run Retrieval-Augmented Generation (RAG) over millions of internal documents with strict data privacy — no data ever leaves India.

Cost Optimization

Model Routing & Batch Processing

Replace expensive API endpoints in high-volume workloads with Casturi's high-speed endpoint to reduce operational costs overnight.

OpenAI Endpoint Integration

100% OpenAI-Ready API Access.

Zero code refactoring needed. Simply update your base URL to https://api.casturi.ai/v1 and use your existing OpenAI SDKs, LangChain, LlamaIndex, or AutoGen applications.

  • Drop-in replacement — compatible with /v1/chat/completions.
  • Real-time streaming — low first-token latency with standard SSE tokens.
  • Tool & function calling — pass tools array directly in payload.
from openai import OpenAI

# Initialize Casturi OpenAI-compatible client
client = OpenAI(
    base_url="https://api.casturi.ai/v1",
    api_key="sk-casturi-your-api-key"
)

response = client.chat.completions.create(
    model="casturi-llm-v1",
    messages=[
        {"role": "system", "content": "You are an expert AI engineer."},
        {"role": "user", "content": "Optimize this microservice query"}
    ],
    temperature=0.2,
    stream=True
)

for chunk in response:
    print(chunk.choices[0].delta.content or "", end="")
import OpenAI from 'openai';

const openai = new OpenAI({
  baseURL: 'https://api.casturi.ai/v1',
  apiKey: process.env.CASTURI_API_KEY,
});

async function main() {
  const completion = await openai.chat.completions.create({
    model: 'casturi-llm-v1',
    messages: [{ role: 'user', content: 'Generate a React modal component' }],
    temperature: 0.3,
  });
  console.log(completion.choices[0].message.content);
}
main();
curl https://api.casturi.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-casturi-your-api-key" \
  -d '{
    "model": "casturi-llm-v1",
    "messages": [
      {"role": "user", "content": "Explain async context managers in Python"}
    ],
    "temperature": 0.2
  }'
package main

import (
    "context"
    "fmt"
    "github.com/sashabaranov/go-openai"
)

func main() {
    config := openai.DefaultConfig("sk-casturi-your-api-key")
    config.BaseURL = "https://api.casturi.ai/v1"
    client := openai.NewClientWithConfig(config)

    resp, _ := client.CreateChatCompletion(context.Background(), openai.ChatCompletionRequest{
        Model: "casturi-llm-v1",
        Messages: []openai.ChatCompletionMessage{{Role: "user", Content: "Hello Casturi!"}},
    })
    fmt.Println(resp.Choices[0].Message.Content)
}
Casturi Studio

Beyond chat: build and run your own agents.

Casturi Studio is the agent workspace behind the chat window — define a system prompt, wire up tools, and hand it a job. No separate product to learn.

Code Reviewer
Research Assistant
SQL Analyst
Support Triage
+ New agent

Code Reviewer

Reads a diff, runs it against your test suite in a sandbox, and flags security issues before merge — invoked from any chat, or wired into a workflow.

execute_code file_search tools / function calling deferred_tools

Pick a ready-made agent

Start from a curated set — code review, research, SQL, support triage — instead of writing a system prompt from scratch.

Build your own

Give an agent a name, instructions, and a toolset — code execution, file search, custom actions — and it's ready to use in any conversation.

Share from the marketplace

Publish an agent for your team or pull one someone else on Casturi already built — no redeploy required.

🚀 Casturi Startup Initiative

Get 100M Free Tokens for Your Startup or Product Launch.

Building the next big AI app or launching a new product in India? We are granting 100,000,000 free tokens to eligible startups, along with 1-on-1 technical support and high rate limits.

100M API Tokens

Worth ₹1,50,000+ in API credits to build, test, and launch your prototype with zero overhead.

100% OpenAI Compatible

No code changes required. Connect your existing codebase in 60 seconds.

Priority Support

Direct engineering channel on WhatsApp/Slack with Casturi LLM core team.

Apply for Startup Grant View Console Dashboard
Application Showcase

Crafted for Exceptional User Experience.

Explore the Casturi web application — built with intuitive agent tools, multi-model selectors, code artifact execution, and seamless dark & light themes.

Casturi Chat UI

Casturi Chat Interface

Full conversation history, code execution status, syntax highlighting, and responsive agent selector.

Casturi Agent Hub & API Console

Agent Hub & Developer Console

Manage custom agents, track token usage, generate API keys, and monitor active startup grants.

Plans

Start Free. Scale as You Grow.

The preview is invite-only, so every account starts on Free. Upgrades are granted by the Casturi team — no payment step required during preview.

Free

For trying Casturi LLM and testing features.

₹0 / month

  • Free daily message allocation
  • Full Casturi LLM model
  • Searchable chat history
  • File and image uploads
Request an invite

Startup & Enterprise

For startups and enterprise teams.

100M Grant / Free

  • 100,000,000 Free Startup Tokens
  • Dedicated domestic VPC hosting option
  • Custom SLAs and technical onboarding
  • Central admin user management
Claim Startup Grant
Questions

Frequently Asked Questions.

How do I integrate Casturi API into my existing OpenAI app?

Casturi API is 100% OpenAI compatible. Simply pass base_url="https://api.casturi.ai/v1" into your OpenAI SDK instance and use your Casturi API key. Your code will run without any syntax or logic changes.

How do I apply for the 100M Token Startup Program?

Fill out the Request Access form below and select "Startup Program Grant" or mention your product details. Our engineering team reviews requests and grants 100M free tokens within 24 hours.

Why is Casturi significantly cheaper than international models?

Casturi is optimized specifically for high-efficiency inference hosted directly in Indian datacenter infrastructure, eliminating expensive international routing and overhead.

Is my data kept securely in India?

Yes. Prompts and API requests are processed strictly on domestic Indian servers. Your data is never shared with third parties or used for external model training.

Which tools and agentic features are supported?

Casturi supports live web browsing, sandboxed Python execution, multi-step tool calling, file analysis, and agent marketplace deployment.

Request Access / Startup Grant

Get Started with Casturi.

Join the preview list or apply for the 100M Free Startup Token Grant. We process access requests daily.

No spamNo card required100M Token Grant Available

I already have an account

We use your email only to deliver your invite code & API credentials.

Log in Request access