Praxel
Praxel Arena ( https://arena.praxel.in ) is an AI-native skill credentialing platform where business professionals prove their skills through 30-second micro-interactions, not month-long courses or $10K certifications.
Core trick
Scores each swipe-card response across six judgment dimensions, then compares two users' dimension scores in head-to-head Elo duels.
Description
Praxel Arena ( https://arena.praxel.in ) is an AI-native skill credentialing platform where business professionals prove their skills through 30-second micro-interactions, not month-long courses or $10K certifications.
Users swipe through AI-generated cards (spot-the-signal, forced tradeoffs, rank-and-prioritize) that test business judgment across six cognitive dimensions. Every response is evaluated by Claude in real-time with per-dimension scoring and personalized feedback.
Three modes: Learn (drills with teaching moments), Practice (timed sprints with AI debriefs), and Compete (head-to-head duels with chess-style Elo ratings and side-by-side radar comparisons).
Opus 4.6 is the entire testing infrastructure. It generates assessments across 24 business topics, evaluates nuanced judgment with dimensional scoring, powers duel adjudication comparing two professionals side-by-side, and conducts Socratic voice coaching via ElevenLabs.
README excerpt
# Praxel Arena **Learn. Practice. Compete. Credential.** Praxel Arena is a skill credentialing platform for business professionals. Users learn through micro-interactions, practice with adaptive challenges, and compete in AI-generated head-to-head duels to build a public Skill Graph that replaces traditional credentials. ## How It Works | Mode | Description | |------|-------------| | **Learn** | Teaching chains with micro-interactions. 2-3 sentence lessons followed by immediate tests. | | **Practice** | No teaching preamble. Harder challenges. AI-generated debrief at the end. | | **Compete** | Head-to-head duels. Claude generates unique business scenarios. Elo-rated. | Every interaction takes 10-30 seconds. No passive reading. Active thinking only. ## How Claude Opus 4.6 Is Used Claude Opus 4.6 powers the entire assessment infrastructure -- not as a chatbot, but as seven distinct capabilities: 1. **Dynamic Scenario Generation** -- Each competitive duel features a unique, coherent business scenario that unfolds across 8 micro-interactions. No two duels are identical. 2. **6-Dimension Cognitive Assessment** -- Evaluates responses across Analytical Thinking, Strategic Reasoning, Quantitative Reasoning, Communication Clarity, Decision Quality, and Creative Problem Solving. 3. **Head-to-Head Comparative Analysis** -- Compares two players' full response sets like a business school professor grading essays side-by-side. 4. **Mentorship-Quality Debriefs** -- References specif