Introducing NeuroSim: Evaluate Browser Agents & Model in a Private Sandbox
Stress-test your browser agent in our dedicated sandbox, surface the metrics "that matter," and join our limited beta cohort.
Beta Access (Free While We Iterate)
Full access - run as many evaluations as you need while we iterate and gather feedback.
Direct Slack channel for feedback & feature requests. Email info@paradigm-shift.ai to join.
Why we built NeuroSim
Benchmark leaderboards look shiny, but they rarely predict real-world success. Agents still stumble on login flows, throttling banners, or captchas. NeuroSim bridges that gap by letting you:
- Spin up unlimited private benchmarks that mirror your production workflows.
- Build a targeted performance history that shows exactly how changes impact your use-case-not a generic public leaderboard.
- Re-evaluate continually so every code or model update is validated before release.
Whether you"re an indie hacker, a fast-moving startup, or an enterprise lab refining a foundation model-NeuroSim gives you signal, not vanity stats.
1. Headless Chromium VM Setup
| What you do | What we handle |
|---|---|
| Create an agent card on AgentHub | Automatic UI & endpoint scaffolding |
| (Optional) Ship a Docker container for closed-source models | We write the adapter, keep it in your VPC |
| Point to any frontier model (GPT-4o, Gemini 2.5, Claude 4.0 Sonnet...) | Sandbox orchestration & scaling |
| Adjust episodes, temperature, retry limits | Real-time telemetry & fail-fast guards |
Once your adapter is wired up, NeuroSim spins up a fresh VM running headless Chromium and drives it through your selected tasks.
Outcome: test your planning/execution engine across any LLM stack without touching infra.
NeuroSim headless browser evaluation setup showing agent configuration and parameter tweaking for enterprise AI teams
2. Build a task pipeline that actually matters
- Library of ~4,000 web tasks - 500 curated workflows + WebVoyager (650) + WebBench (2,700).
- Bring your own - upload proprietary tasks or entire client flows; we sandbox them in a private project.
- Guided curation - our team helps you pick the smallest set that still lights up the biggest weaknesses.
Click Run and NeuroSim spins up disposable VMs, records every frame, and streams live logs to the dashboard.
NeuroSim task pipeline creation interface for building custom browser agent evaluation workflows
3. Gap-to-Human Analytics Control Room
After each run you"ll see:
- Success Rates - from agent logs, LLM-as-a-Judge verdicts, and (soon) optional human review.
- Token & Cost - total and per-task breakdown with cost estimates under your own API billing.
- Runtime & Latency - batch duration plus latency histograms to spot slowdowns.
- Gap-to-Human & Alignment - deltas for steps/latency and an overall 0-100 score versus our human baseline on most tasks.
- Raw Exports - full terminal logs, screenshots, and JSON bundles ready for fine-tuning loops.
NewEpisodes setting - choose how many episodes to run per task and compare episode-level stats side-by-side in the UI (more analytics coming).
Screenshot of gap-to-human metrics comparing AI model vs. human baseline in NeuroSim analytics dashboard
LLM-as-a-Judge (deep dive)
For every task we log:
- Pass / Fail decision.
- 0-10 execution score.
- One-sentence summary of what happened.
- Step-completion rate - how many actions succeeded vs. errored.
- Captcha counter - encountered / solved / unsolved.
- Top issue codes (e.g., captcha unsolved, navigation error, lack of evidence, response mismatch, security block).
These insights help you triage failures fast and focus on the biggest gains.
LLM-as-a-Judge scoring system in action showing automated evaluation of browser agent performance
4. Enterprise-Ready Agent Leaderboard & Time-Series Tracking
NeuroSim maintains comprehensive performance tracking with features like:
- Regression detection - compare agent performance over time and quickly catch drops before they hit production.
- A/B testing - benchmark different model + agent combinations on the exact same task set.
- Marketing charts - export share-safe performance charts for investor updates ("Our agent beats human baseline on key workflows").
- Team collaboration - share live leaderboards with colleagues and choose full or read-only access permissions.
- Model optimization - analyze which LLM × agent combination delivers the best performance for your specific use cases.
Time-series agent leaderboard showing enterprise AI testing results and performance trends over time
Coming Soon
- Multi-episode analytics - deeper stats when you run each task dozens of times.
- Human-in-the-loop review - optional human graders for high-stakes flows.
- Smarter LLM-Judge - continuous prompt & model tweaks for higher reliability.
- More task libraries and UI polish shipped regularly
Join the beta
NeuroSim is evolving quickly-we"re constantly refining the analytics experience and adding deeper insights. If you"d like to kick the tires and influence the roadmap, we"d love to have you in the beta cohort.
Email us at info@paradigm-shift.ai or book a consultation.