Made by Zak

Meet RxReason.

Meet RxReason.

Meet RxReason.

Advanced medication-safety reasoning that runs locally on your phone, keeping your questions private while knowing when to answer, clarify, caution, or escalate.

  • Runs locally on your phone

  • 1,000 fresh blind cases

  • 40 medication-safety actions

  • 95.56% action accuracy

  • Answer, clarify, caution, or escalate

Powerful medical reasoning, built to run on your phone.

Private by Design

RxReason runs locally on your phone, helping keep sensitive medication questions on your device instead of sending them to the cloud.

Safety-Aware

It knows when to answer, ask for more context, provide a warning, or escalate when a medication question may be urgent.

MVN Studio Website Mockup
Built to Reason

RxReason considers dosage, age, symptoms, interactions, health conditions, and missing information before deciding how to respond.

Tested for the Hard Cases

RxReason is evaluated across dosing errors, drug interactions, pediatric use, pregnancy, and urgent medication scenarios, not just simple questions.

Tested where medication safety matters most.

RxBench-SOL

Measuring the decisions ordinary medical benchmarks miss

RxReason is tested on source-backed medication scenarios involving dosing errors, drug interactions, pediatric use, pregnancy, acute illness, and urgent warning signs.

Instead of measuring medical knowledge alone, RxBench-SOL evaluates whether the model knows when to answer, ask for more context, provide a warning, or escalate.

1,000

Fresh blind cases

Built to test difficult medication-safety scenarios

40

Safety actions

Answer, clarify, caution, or escalate

Blind Evaluation

Validated for Medication Safety

On a fresh blind RxBench-SOL evaluation, the official RxReason safety stack outperformed the base model while reducing unsafe responses and improving reliability.

The result shows that stronger medication reasoning is not only about answering more questions. It is about recognizing when a normal answer is not enough.

95.6

95.6

Blind Benchmark Accuracy

Measured on real medication-safety decisions

95.6

95.6

Blind Benchmark Accuracy

Measured on real medication-safety decisions

0

0

Critical unsafe responses

From the official RxReason safety stack

0

0

Critical unsafe responses

From the official RxReason safety stack

RxReason by the Numbers

Medication-Safety Action Accuracy

Same 1,600-case development evaluation

100%

95%

90%

85%

80%

75%

83.88%

84.38%

+11.2 pts vs GPT-5.3

95.56%

Gemini 3.1 Flash-Lite

ChatGPT-5.3

RxReason

Outperforming Leading AI Models

RxReason achieved the highest accuracy on medication-safety decisions, outperforming both general-purpose and external AI models on the same 1,600-case evaluation.

When Knowing Is Not Enough

The Safety Decision Before the Answer

Beyond Medical Knowledge

MedQA tests medical-exam questions, PubMedQA tests biomedical research reasoning, and HealthBench grades broad health conversations. RxBench-SOL complements them by isolating medication-safety action selection.

Beyond Medical Knowledge

Most benchmarks test knowledge or broad conversation. RxBench-SOL isolates medication-safety action selection.

Medication Harm Matters

WHO reports that medications account for half of preventable harm in medical care. CDC estimates over 1.5 million U.S. emergency visits for adverse drug events each year.

Medication Harm Matters

Medications cause half of preventable medical harm; U.S. adverse drug events drive over 1.5 million emergency visits yearly.

Context Changes Safety

Missing dose, timing, age, weight, pregnancy status, symptoms, kidney function, or interacting medicines can change the safest action from ANSWER to CLARIFY, CAUTION, or URGENT.

Context Changes Safety

Missing patient details can change the safest action from ANSWER to CLARIFY, CAUTION, or URGENT.

Two Distinct Failure Modes

Under-caution can miss overdose, interaction, or emergency signals. Over-caution can unnecessarily block routine questions. RxBench-SOL reports both separately, alongside critical unsafe outcomes and parse failures.

Two Distinct Failure Modes

RxBench-SOL measures dangerous under-caution and disruptive over-caution as separate failure modes.

Audited, Not Assumed

The 1,100-case v0.8.1 release corrected 43 objective inconsistencies without using model outputs, then passed validation with zero errors and zero group-overlap leakage errors.

Audited, Not Assumed

v0.8.1 corrected 43 objective inconsistencies, with zero validation and group-overlap leakage errors.

Built to Measure

Across 1,100 constructed cases, four actions, 15 safety categories, 123 rule families, and 40 counterfactual groups, scoring separates accuracy, safety weighting, caution errors, and parse failures.

Built to Measure

1,100 cases cover four actions, 15 categories, 123 rule families, and 40 counterfactual groups.

Source-backed and builder-audited, not clinician-validated. Benchmark performance does not establish clinical deployment safety.

Questions Worth Asking

Why not just use a larger AI model?
What happens when RxReason is uncertain?
How does RxReason avoid warning users about everything?
Why focus specifically on medications?
Can a model running on a phone still be powerful?
What is the next step for RxReason?
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RxReason

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