Now in Public Beta · v1.0

Fine-tune any
open-source
model.

Inject your proprietary data into open-source LLMs and deploy production-grade intelligence through CLI, SDKs, or Mac App — in minutes.

50+ open-source modelsLoRA & QLoRA built-in< 5 min to first fine-tune
langtrain · terminalrunning
$ langtrain inject ./data --model llama-3
✓ 14,832 examples validated
✓ llama-3-8b-instruct loaded
⠿ Fine-tuning · epoch 3/3 loss: 0.142
$ langtrain deploy --name support-v2
✓ Live → api.yourdomain.ai/v1
⚡ 68ms avg latency · 99.9% uptime
99.9%
Uptime
68ms
Latency
SOC2
Compliant
L
Langtrain

The complete platform for training and deploying custom AI models. Built for builders.

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© 2026 Langtrain. All rights reserved.

Made with ♥ in India

LANGTRAIN
The Problem

Open-source models are powerful — but not yours.

Without fine-tuning, every model you deploy is a stranger to your business.

⊗
Accuracy

Context rot

Public models were trained on the internet — not your business. Every inference drifts further from your domain.

⊘
Memory

No memory

LLMs forget everything outside a context window. No institutional knowledge survives between sessions.

⊜
Knowledge

No proprietary knowledge

Your SOPs, products, and internal data live in your systems. Base models have never seen them.

◈
Reliability

Not production-ready

Hallucinations, inconsistency, and latency at scale. Base models are research artifacts, not infrastructure.

The Platform

Every tool you need.
Nothing you don't.

Model Hub

50+ open-source models.

Pick any base model. We handle quantization, adapter merging, and format conversion.

Llama 3.2
3B / 11B / 90B
Mistral 7B
7B
Phi-4
14B
Gemma 2
2B / 9B / 27B
Qwen 2.5
7B / 72B
DeepSeek R1
7B / 14B
Training Engine

LoRA & QLoRA

Configurable rank, epochs, learning rate. No PyTorch.

epoch 1loss: 0.31epoch 15
Guardrails

Safety by default.

PII, profanity, regex rules, custom classifiers — enforced at inference.

PII Detection
12 blocked
Profanity Filter
0 today
Min output length
> 80 chars
Custom regex
/SSN: \d{9}/
Deploy

One command.

Managed endpoint, private VPC, or export to GGUF / ONNX.

$ langtrain deploy --name support-v2
✓ Model packaged (2.1 GB)
✓ Endpoint provisioned
→ api.yourdomain.ai/v1
68ms avg · 99.9% uptime
Interfaces

Meets you where you work.

GUI, CLI, SDK, or raw HTTP — same underlying platform.

Mac App
REST API
Python SDK
CLI
Evaluations

Measure what matters.

Run benchmark evals and compare your fine-tuned model against the base before shipping.

Accuracybase 61% → ft 94%
BLEUbase 38% → ft 79%
F1base 52% → ft 88%
Privacy

Your weights.
Your infra.

On-premise mode, private VPC deployment, zero telemetry on training data. SOC2 compliant.

Zero data egress
On-prem GPU support
SOC2 Type II
How It Works

Raw data to live API
in four steps.

Step 01 — terminal
$ langtrain inject ./support-logs.jsonl --model llama-3-8b
✓ 14,832 instruction pairs validated
✓ 0 duplicates removed
✓ Split: 13,348 train / 1,484 eval
Supports: JSONL · CSV · PDF · Markdown · HF datasets
Access Anywhere

Every interface.
One model.

Native desktop apps, CLI, Python, and TypeScript — access your custom model however your team builds.

Langtrain

Mac App

Download

macOS 12+ · Apple Silicon & Intel

native fine-tuning studio for macOS. Metal-accelerated, works offline.

View
Langtrain

Windows App

Download

Windows 10 / 11 · x64

Full-featured Studio for Windows with NVIDIA CUDA acceleration.

View
Langtrain

Linux App

Download

Ubuntu 20.04+ · .deb / AppImage

Native Studio for Linux with CUDA support and headless training mode.

View
Langtrain

CLI

Install

npm i -g langtrain

The complete Langtrain workflow from your terminal. CI/CD-ready.

View on Install
Langtrain

Python SDK

PyPI

pip install langtrain

First-class Python SDK for fine-tuning and inference. Works with any ML stack.

View on PyPI
Langtrain

NPM Package

NPM

npm install langtrain

Full TypeScript SDK with streaming support and complete type safety.

View on NPM
Built to Last
50+
Open-Source Models
Llama, Mistral, Phi, Gemma & more
< 5 min
First Fine-Tune
Upload to training in minutes
1 cmd
To Deploy
langtrain deploy — live instantly
100%
Weight Ownership
Zero vendor lock-in, ever
SOC2 Compliant
On-premise option
Multi-region
< 100ms p99
Free for individuals & open-source teams

Your model. Your data.
Your edge.

Turn open-source models into production-grade domain intelligence — without giving up your weights, your data, or your autonomy.

  • Free for individuals & open-source teams
  • Keep 100% of your weights — no lock-in
  • Deploy anywhere: cloud, on-prem, or edge
langtrain CLI
$ pip install langtrain
✔ Installed langtrain 0.1.12
$ langtrain tune --model llama3.1-8b \
--dataset ./my-data.jsonl \
--epochs 3
⠿ Starting job #lt-9f3a…
✔ Job complete — epoch 3/3 · loss 0.041
$ langtrain deploy --job lt-9f3a
✔ Live → https://api.langtrain.xyz/v1/models/my-llama

Joined by developers at Anthropic, Hugging Face, Cohere & more