PromptUnit.ai
Now in public beta — free to start

Smarter AI inference. Lower cost.

Your company is wasting 40–70% of its AI spend. PromptUnit sits between your code and your AI providers — logs every call, shows where money goes, and automatically routes to the cheapest model that still gets the job done.

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integration.py
# Before — direct to OpenAI
from openai import OpenAI
client = OpenAI(base_url="https://api.openai.com/v1")
# After — one line change, all the savings
from openai import OpenAI
client = OpenAI(
base_url="https://api.promptunit.ai/v1",
api_key=your_promptunit_key
)

Works with any OpenAI-compatible SDK — Python, Node, Go, Ruby

Trusted by engineering teams at

StripeNotionLinearVercelFigmaLoom

Supported AI providers

Most popular
OpenAI
  • gpt-4o
  • gpt-4o-mini
  • gpt-4
  • o1
Connected
Best quality
Anthropic
  • claude-opus-4
  • claude-sonnet-4
  • claude-haiku
Connected
Cheapest
Google
  • gemini-2.0-flash
  • gemini-1.5-pro
  • gemini-1.5-flash
Connected
Fastest
Groq
  • llama-3.3-70b
  • llama-3.1-8b
  • mixtral-8x7b
Connected
The Problem

You're flying blind on AI spend

  • Massive invisible waste

    40–70% of AI API spend goes to over-provisioned models. GPT-4 handles tasks GPT-4o-mini would do just as well.

  • Zero visibility

    You get one bill from OpenAI with no breakdown by feature, user, or task type. You can't optimize what you can't measure.

  • Vendor lock-in by default

    Switching providers means rewriting SDK calls across your entire codebase. So you don't. And you keep overpaying.

The Solution

PromptUnit intercepts, analyzes, and optimizes

  • Transparent proxy

    Every AI call flows through PromptUnit. We log token counts, latency, and cost before forwarding — zero latency overhead.

  • Intelligent routing

    We classify each request and route to the cheapest capable model. Same quality, lower bill. You set the quality floor.

  • Actionable analytics

    See spend by endpoint, feature, model, and user. Identify wasteful patterns and fix them with a config change.

How it works

Up and running in minutes

01

Connect

Add your provider API keys to PromptUnit and swap one line of code — your baseURL. No SDK changes, no refactoring.

Takes ~5 minutes
02

Analyze

Watch your spend dashboard populate in real time. See cost broken down by model, feature, and user segment.

Data from first call
03

Save

Enable smart routing. We benchmark and route each request to the cheapest model that clears your quality bar.

Savings from day one

Features

Everything your AI stack needs

Built for engineering teams who care about cost, reliability, and observability.

Smart Routing

Automatically selects the cheapest model that meets your quality threshold. Stop overpaying for GPT-4 when 4o-mini handles it perfectly.

Cost Analytics

Per-feature, per-model, per-user spend breakdowns. Know exactly which part of your product burns AI budget.

Zero Code Change

One line: swap your baseURL to api.promptunit.ai. Keep your existing OpenAI SDK. Every provider, same interface.

Multi-Provider

OpenAI, Anthropic, Google, Groq — one proxy to rule them all. Switch providers without touching application code.

Real-time Logs

Stream every prompt, completion, token count, and latency. Debug production AI issues in seconds, not hours.

Quality Guardrails

Set minimum quality scores per route. We benchmark outputs so you never trade a customer experience for a cheaper token.

Live numbers

Real savings, real teams

3.2M+

API calls proxied

$847K

Total saved for customers

67%

Average cost reduction

4

AI providers supported

Integration

Before and after — one line of code

Works with OpenAI SDK in Python, Node.js, Go, Ruby, and any HTTP client.

PythonNode.js
BEFORE — paying full price
from openai import OpenAI
client = OpenAI()
response = client.chat.completions.create(
model="gpt-4-turbo", # $10/M tokens
messages=[{"role": "user", "content": prompt}]
)
AFTER — PromptUnit routes intelligently
from openai import OpenAI
client = OpenAI(
base_url="https://api.promptunit.ai/v1", # 1 line change
api_key=os.environ["INFERIO_KEY"]
)
response = client.chat.completions.create(
model="gpt-4-turbo", # we route smarter
messages=[{"role": "user", "content": prompt}]
)
↓ 67% avg cost reduction·Same API. Same SDK. Your existing code unchanged.

Pricing

Aligned with your success

We only make money when you save money. Zero savings means zero bill.

Performance-based pricing
$0to get started
+20%of verified savings
  • Unlimited API calls proxied
  • All provider integrations (OpenAI, Anthropic, Google, Groq)
  • Real-time cost analytics dashboard
  • Smart model routing with quality guardrails
  • Full request/response logging
  • Slack & email spend alerts
  • SOC 2 Type II (in progress)
Get Started Free — no card required

No savings

No bill

Cancel anytime

No contracts

Free forever

If we fail

Testimonials

Teams who made the switch

“We cut our monthly OpenAI bill from $14k to under $4k in the first week. The routing is surprisingly accurate — our CSAT didn't move at all.”
PM

Priya Mehta

CTO, Fieldly

“The one-line integration is not marketing fluff. I changed the baseURL, added the API key, and had my first savings dashboard in under ten minutes.”
JO

James Okafor

Staff Engineer, Loop AI

“Finally I can answer the CFO's 'why is AI so expensive' question with actual data. The per-feature breakdown is something I've wanted for months.”
SL

Sofia Lindqvist

Head of Platform, Kova

FAQ

Frequently asked questions

We maintain a continuously-updated benchmark of model outputs across task categories. When a request comes in, we classify the task type and route to the cheapest model whose benchmark score meets your configured quality threshold. You can tune the threshold per route or globally.
Yes — PromptUnit acts as a transparent proxy. Your prompts and completions are logged for analytics (you can see them in the dashboard) and then forwarded to the target provider. We do not use your data to train any models. You can enable log redaction if you handle sensitive data.
We run with 99.99% uptime SLAs backed by multi-region failover. In the unlikely event of an outage, our SDK includes an automatic passthrough mode that routes directly to your configured fallback provider with zero code changes needed on your side.
We compare your actual monthly spend through PromptUnit with a calculated baseline — what you would have paid at your original model selection and usage patterns. The fee is 20% of the verified delta. If there's no delta, there's no bill. Simple.
Currently: OpenAI, Anthropic (Claude), Google (Gemini), and Groq. AWS Bedrock and Cohere are in private beta. We add providers based on demand — reach out if yours isn't listed.

Stop overpaying for AI.
Start saving today.

Free to start. We earn only when you save. If PromptUnit doesn't reduce your AI spend, you owe us nothing.

Get Started FreeRead the docs

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