LiteSeed
Synthetic Training Data for LLMs

Your model is not the problem. Your data is.

Turn 10 examples into millions of training rows — and improve them with real model feedback.

10×
faster iteration
100%
deterministic
scalable
liteseed.generate
[014501]{ "id": 14501, "ts": "09:25:36.702", "type": "customer_support", "edge_case": "angry_user", "sentiment": "negative", "intent": "cancel_subscription", "channel": "chat", "text": "I've been waiting 3 weeks and nobody helped me. Cancel immediately." }
[014502]{ "id": 14502, "ts": "09:25:36.907", "type": "fraud_detection", "pattern": "unusual_transaction", "amount": 4872.50, "merchant_category": "electronics", "device": "new_device", "label": "fraud", "confidence": 0.94 }
[014503]{ "id": 14503, "ts": "09:25:36.962", "type": "autonomous_driving", "scenario": "night_rain", "visibility": 0.3, "road_condition": "wet", "pedestrian_detected": true, "action": "reduce_speed", "speed_delta": -18 }
[014504]{ "id": 14504, "ts": "09:25:37.017", "type": "medical_nlp", "specialty": "cardiology", "note": "Chest tightness, dyspnea on exertion. ECG shows ST-segment changes.", "icd10": "I20.9", "urgency": "high" }
[014505]{ "id": 14505, "ts": "09:25:37.073", "type": "ecommerce_rec", "user_segment": "high_value", "last_category": "running_shoes", "session_duration": 420, "recommendation": "trail_running_gear", "conversion_prob": 0.71 }
[014506]{ "id": 14506, "ts": "09:25:37.128", "type": "customer_support", "edge_case": "language_barrier", "detected_lang": "de", "fallback": true, "escalate": true, "text": "Ich verstehe die Antwort nicht. Bitte helfen Sie mir auf Deutsch." }
[014507]{ "id": 14507, "ts": "09:25:37.183", "type": "fraud_detection", "pattern": "card_testing", "amount": 1.00, "attempts": 12, "time_window_sec": 45, "label": "fraud", "confidence": 0.99 }
[014508]{ "id": 14508, "ts": "09:25:37.239", "type": "autonomous_driving", "scenario": "construction_zone", "lane_markings": "partial", "speed_limit": 30, "obstacle_ahead": true, "action": "lane_change", "safety_score": 0.88 }
[014509]{ "id": 14509, "ts": "09:25:37.294", "type": "medical_nlp", "specialty": "oncology", "note": "12mm lesion in right lower lobe, stable from prior study.", "icd10": "C34.31", "urgency": "medium" }
[014510]{ "id": 14510, "ts": "09:25:37.349", "type": "ecommerce_rec", "user_segment": "returning", "cart_abandonment": true, "abandoned_item": "wireless_headphones", "discount_trigger": true, "offer": "10_percent_off" }
[014511]{ "id": 14511, "ts": "09:25:37.405", "type": "llm_finetuning", "task": "instruction_following", "domain": "legal", "prompt": "Summarize this contract clause:", "response_quality": 0.89, "token_count": 312 }
[014512]{ "id": 14512, "ts": "09:25:37.464", "type": "fraud_detection", "pattern": "account_takeover", "login_location": "RU", "usual_location": "DE", "time_since_last": 14, "label": "fraud", "confidence": 0.97 }
Rows generated:14,562
Closed Loop active
The problem

Training models is fast.
Improving data is not.

Every failed training run costs time, compute and money — without telling you what to fix.

You don't know what data is missing

Real data is scarce, expensive, sensitive or legally blocked. You can't see the gaps.

You don't know why your model fails

Weak metrics don't tell you which dataset property caused them. You see the symptom, not the cause.

You guess → retrain → repeat

Data fixes are manual, inconsistent and slow down every training cycle.

Hidden cost of failure

Every failed training run costs time, compute and money — without telling you what to fix.

The mechanism

LiteSeed turns dataset iteration into a system.

Define your dataset as a blueprint, generate it deterministically, then improve it with actual model feedback.

Repeat. Not guesswork. Measured iteration.

Closed loop
Blueprint
Compile (LLM once)
Generate (deterministic)
Train model
Analyze metrics
Patch blueprint ↺
Generate

Blueprint defines entities, fields, distributions, scenarios and edge cases. LiteSeed generates a versioned dataset deterministically.

Train

Train or fine-tune your model outside LiteSeed using the generated dataset in the format your stack expects.

Analyze

Feed experiment metrics back in. LiteSeed correlates dataset properties with model outcomes and identifies likely weak spots.

Improve

Apply a structured blueprint patch and regenerate. Each iteration is versioned, reproducible and easier to compare.

Key insight
Most teams need weeks to fix their data. LiteSeed does it in a few iterations.
Minimal API example

Blueprint → Generate → Evaluate → Patch

ML engineers need to see that the system is deterministic and API-controllable. Same blueprint, same seed, same row count — same dataset.

Blueprint-driven

Dataset structure is explicit, versioned and patchable.

Compile once

LLM-assisted decisions are frozen before generation starts.

Improve from outcomes

Model metrics feed the next dataset iteration instead of forcing manual guesswork.

Blueprint → Compile → Generate → Patch
Deterministic · API-controllable
import liteseed as ls # 1. Define datasetblueprint = ls.generate_blueprint("""customer support fine-tuning datasetscenarios: refund, delay, cancellationtone: professional, concisebalanced coverage across classes""") # 2. Generate (deterministic)dataset = ls.generate(    blueprint=blueprint,    rows=50000,    seed=42,    format="openai_chat") # 3. Feed back model metricsmetrics = {    "accuracy": 0.89,    "f1": 0.84,    "refund_recall": 0.68} # 4. Patch blueprintpatch = ls.suggest_patch(    blueprint=blueprint,    metrics=metrics,    objective="increase refund recall above 0.80") blueprint_v2 = ls.apply_patch(blueprint, patch)
Possible recommendation

Increase refund denial edge cases and add contrast examples for partial refunds.

Possible recommendation

Shift scenario weights toward ambiguous refund requests with short user inputs.

Interactive demo

See the full loop in action

Select a domain and walk through every step — from blueprint to trained model to patch.

Domain
Step 1 / 12
Outer Loop — Objective
Inner Loop — Data Iteration
Outer Loop — Model Feedback
1. Domain
2. Alignment
3. Blueprint
4. Run
5. Quality+Gap
6. DataCritic
7. Patch
8. New Version
9. Export
10. Training
11. Metrics
12. Outcome
Step 1 — Choose your domain · Outer Loop 1
⚠ Demo limitation
In the demo you choose from 4 pre-built domains. No custom fields or schema uploads.
✦ Full version
Production: define any domain from scratch via natural language prompt or upload your own schema. Unlimited custom fields, relations and domain-specific policies.
Pricing

Simple, transparent pricing

Join the waitlist to lock in early access pricing.

Starter
Prototyping
$99/mo

For individual ML engineers exploring synthetic data.

100k High-Fidelity Rows / month
Basic Blueprint Engine
CSV, JSONL, OpenAI Chat export
Basic metrics feedback
Email Support
Best Value
Professional
Best Value
$299/mo

For ML teams running regular fine-tuning cycles.

500k High-Fidelity Rows / month
Edge-Case Injection
All export formats
Full metrics feedback + versioning
Priority Support
Business
Closed-Loop Automation
$999/mo

Full Closed-Loop Automation for teams that train at scale.

2.5M High-Fidelity Rows / month
Full Closed-Loop API
Custom export pipelines
Advanced data intelligence
Dedicated ML Engineer
Enterprise
Custom Deployment
Custom

Custom deployment, unlimited scale, white-glove support.

Unlimited rows
Custom Deployment
Custom export pipelines
Advanced data intelligence
24/7 White-Glove Support

Need a single batch? ($2.00 per 1k rows). Overage rates for subscribers: Starter: $1.50/1k · Professional: $1.00/1k · Business: $0.75/1k

Honest scope

What LiteSeed does not do yet

LiteSeed focuses on speed, control and dataset iteration. It does not currently focus on manual curation workflows.

No row-level curation

No accept, reject or edit workflow for individual rows after generation.

No coverage auto-fill

Detected gaps are not filled automatically without a patch and re-generation cycle.

No filtered export after curation

Since curation is not part of the current workflow, filtered export is not available either.

Final close

Every iteration without feedback is wasted training time.
Start improving your data now.

Your model performance is limited by how fast your data evolves.

Review the API sketch