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Fine-tune, align, and deploy open-source models on your own infrastructure. Built for enterprise teams that demand total data sovereignty.

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Llama 3.1 8B · Fine-tuned▼
Llama 3.1 8B · Base▼
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Fine-tuned

What's your refund policy for annual subscriptions?

Fine-tuned · Llama 3.1 8B

Annual subscriptions are refundable within 30 days of purchase. After 30 days, you can cancel and keep access until your billing cycle ends. Contact support@acme.com for refunds.

· From: company-policies.pdf
Base Model

What's your refund policy for annual subscriptions?

Base · Llama 3.1 8B

I don't have access to your company's specific refund policy. Please check your account settings, terms of service, or contact customer support for accurate information.

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Langtrain

The fine-tuning platform for production LLMs.
Built for builders who demand sovereignty.

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LANGTRAIN

Supported Open-Source Models
Llama 3.3 70B·Mistral 7B·Phi-4·Gemma 3 27B·Qwen 2.5 72B·DeepSeek R1·Llama 3.2 3B·Mixtral 8×7B·Phi-3.5 Mini·Falcon 180B·Llama 3.3 70B·Mistral 7B·Phi-4·Gemma 3 27B·Qwen 2.5 72B·DeepSeek R1·Llama 3.2 3B·Mixtral 8×7B·Phi-3.5 Mini·Falcon 180B·Llama 3.3 70B·Mistral 7B·Phi-4·Gemma 3 27B·Qwen 2.5 72B·DeepSeek R1·Llama 3.2 3B·Mixtral 8×7B·Phi-3.5 Mini·Falcon 180B·
Mistral Nemo·Llama 3.1 8B·Gemma 2 9B·Qwen 2.5 Coder·CodeLlama 34B·StarCoder 2·Llama 3.2 1B·SmolLM2·Phi-3 Medium·OLMo 2 13B·Mistral Nemo·Llama 3.1 8B·Gemma 2 9B·Qwen 2.5 Coder·CodeLlama 34B·StarCoder 2·Llama 3.2 1B·SmolLM2·Phi-3 Medium·OLMo 2 13B·Mistral Nemo·Llama 3.1 8B·Gemma 2 9B·Qwen 2.5 Coder·CodeLlama 34B·StarCoder 2·Llama 3.2 1B·SmolLM2·Phi-3 Medium·OLMo 2 13B·
20+ Open-Source Models  |  LoRA · QLoRA · Full Fine-Tune  |  0 Tokens Sent to OpenAI
Playground

Test instantly. Compare everything.

Chat with your fine-tuned model the moment training ends. Compare outputs side-by-side against the base model with source citations.

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Llama 3.1 8B · Fine-tuned▼
Llama 3.1 8B · Base▼
Compare Mode ON
Fine-tuned

What's your refund policy for annual subscriptions?

Fine-tuned · Llama 3.1 8B

Annual subscriptions are refundable within 30 days of purchase. After 30 days, you can cancel and keep access until your billing cycle ends. Contact support@acme.com for refunds.

· From: company-policies.pdf
Base Model

What's your refund policy for annual subscriptions?

Base · Llama 3.1 8B

I don't have access to your company's specific refund policy. Please check your account settings, terms of service, or contact customer support for accurate information.

Fine-Tuning

Train on your data. Own every weight.

LoRA, QLoRA, DPO, GRPO — all on your infrastructure. Live loss curves stream to your browser. No black boxes.

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Training Job1/12 epochs
meta-llama/Llama-3-8B
LoRA r=16
2.40Loss
55.0%Accuracy
2.50Val Loss
78%GPU Util
Loss Curve
Train
Val
GPU Cluster8× A100 80GB
94%
89%
96%
82%
93%
87%
97%
91%
Knowledge

Ingest anything. Know everything.

Connect PDFs, Slack, Notion, or any database. Chunked, embedded, and queryable — inside your VPC. No re-training required.

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Knowledge Sources

5 sources · 34,260 chunks indexed

SourceTypeChunksStatus
Company SOPs
PDF2,840
Ready
Slack Engineering
API14,200
Ready
Notion Wiki
Web8,920
Ready
CRM Transcripts
CSV5,100
0%
GitHub Issues
API3,200
Ready
Ingestion ProgressCRM Transcripts
Embedding chunks...0 / 5,100
Endpoints

Deploy everywhere. Zero per-token cost.

One-click endpoints with vLLM-backed serving and auto-scaling. You own the hardware, you own the economics.

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Live Endpoints

4 endpoints · 3 regions · 508 req/s

EndpointModelRegionRPSStatus
support-bot-v3
Llama 3 FT
us-east-1
142
Live
docs-assistant
Llama 3 FT
eu-west-1
95
Live
sales-copilot
Qwen 2.5 FT
ap-south-1
74
Live
code-reviewer
DeepSeek V3
us-west-2
211
Scaling
Traffic — Last 24havg 340 req/s
00:0012:00now
API
curl https://api.langtrain.xyz/v1/chat \
-H "Authorization: Bearer $LT_KEY"
Agents

Build AI workflows that actually run.

Visual node editor connects your fine-tuned models to tools, triggers, and APIs. Ships as a production agent in one click.

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Lead Qualification Engine

Sovereign Deployment

Lead Incoming
Webhook
Ready
Semantic Analysis
Claude 3.5
Ready
Qualified Lead?
Router
Ready
Create Deal
Salesforce
Ready
Notify Team
Slack
Ready
Alignment

Align to your voice. Not anyone else's.

Collect human preference pairs, run PPO or GRPO, and ship a model your team actually prefers. No data leaves your org.

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RLHF Alignment Studio

Compare responses · Train reward model

Pair 12 of 48
Prompt

Explain our data retention policy to a customer

Response A

We keep your data for 90 days after account deletion. During this period, you can request a full export. After 90 days, all data is permanently purged from our systems, including backups. We comply with GDPR right-to-erasure requirements.

Response B

Your data is retained per our standard policy. Please refer to our terms of service for detailed information about data handling and retention periods.

12Pairs Labeled
94%Agreement Rate
87.2%Reward Accuracy
Your models. Your infrastructure. Your rules.

Fine-tune, evaluate, and deploy private language models — 100% on your infrastructure. No per-token cost, no vendor lock, no telemetry.

Start building freeRead the docs
12,400+Models trained
< 30sFrom checkpoint to API
11+Training methods
100%Weights ownership
No Vendor Lock-In
SOC 2 Type II
Air-Gapped Deployment

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