PromptUnit

Overview

PromptUnit is an AI model router and proxy platform designed to reduce large language model API expenses by automatically redirecting simple requests to cheaper, equivalent models. It operates as an OpenAI-compatible proxy that inspects incoming calls in real time and dynamically routes them based on evaluated task complexity. The service is built to help software teams cut inference spend on routine tasks without modifying their core application logic or prompt code.

Key Features

• Intelligent model routing — Classifies incoming prompts across ten signal dimensions to route each call to the lowest-cost model meeting defined quality thresholds.
• Drop-in proxy setup — Integrates by updating existing OpenAI base URL and API key configuration settings without changing underlying SDKs or response handlers.
• Multi-provider connectivity — Connects directly to OpenAI, Anthropic, Google, Groq, and DeepSeek, with additional support for OpenRouter accounts.
• Guardrails for complex workflows — Preserves the user's selected frontier model for image inputs, complex tool outputs, and sensitive tasks to prevent functional errors.
• Metadata-only data policy — Records operational metadata like token counts, latency, and task types while strictly omitting prompts, completions, system messages, and end-user IPs from logs.
• Granular cost attribution — Tracks expenses by individual application feature tags and enforces configurable hourly and daily spend limits.
• Nightly model tuning — Automatically recalibrates quality thresholds and routing decisions each night based on verified task performance.

Who It's For

PromptUnit is targeted at software engineers, technical founders, and product teams operating applications with high-volume LLM API traffic across repetitive text tasks such as categorization, data extraction, and customer support. It is particularly suited for organizations looking to optimize production OpenAI or Anthropic API bills without manually splitting features across different vendor SDKs. It is not designed to optimize individual developer seats for IDE extensions or coding assistants.

Notable Strengths

PromptUnit differentiates itself with a purely gain-share pricing structure, billing users 20% of verified cost reductions with no baseline subscription or maintenance fees. Its integration process requires adjusting only two environment variables, allowing teams to test and deploy model routing within minutes. Additionally, the service maintains a clear data minimization architecture that encrypts API keys using AES-256-GCM and explicitly refrains from storing prompt or completion payloads.