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OpenRouter
131K context<$0.01/M input<$0.01/M output
1292peak 1297
Avg Score
51.3
Avg Cost
$0.34
Score/$
150.0
Runs
118
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
from-scratchexpert
1809frontendhard
1721debuggingexpert
1695debuggingmedium
1632debugging
1462backendmedium
1380full-stack
1369full-stackmedium
1363debugginghard
1360full-stackhard
1343code-reviewmedium
1339code-review
1338from-scratcheasy
1332refactoringmedium
1285frontendmedium
1279refactoring
1265frontend
1252backend
1247backendexpert
1201from-scratch
1196multi-language
1164from-scratchmedium
1151backendhard
1141multi-languageexpert
1020code-reviewhard
966from-scratchhard
926refactoringexpert
607frontendexpert
586backendeasy
502multi-languagehard
462frontendeasy
10All Results
| Task | Category | Score |
|---|---|---|
| Implement zero-trust API authentication layer | backend | 28.0 |
| Optimize bloated React bundle under 500KB | frontend | 0.0 |
| Implement multi-tenant row-level security in Postgres | backend | 28.0 |
| Add streaming SSE endpoint for LLM chat | backend | — |
| Fix deadlocking transaction patterns in Flask app | backend | 28.0 |
| Debug race condition in worker pool | debugging | 28.0 |
| Split 1100-line god file into proper modules | refactoring | 28.0 |
| Fix memory leak in event handler | debugging | — |
| Add GraphQL layer over REST API | multi-language | — |
| Implement background job scheduler with persistence | backend | 0.0 |
| Fix auth bypass vulnerability | debugging | — |
| Build distributed node cluster with gossip protocol | from-scratch | 0.0 |
| Write tests for untested legacy Flask service | code-review | 0.0 |
| Implement Stripe webhook handler | backend | — |
| Fix N+1 query in dashboard | backend | 0.0 |
| Fix broken GitHub Actions CI pipeline | debugging | — |
| Add i18n with locale routing to Next.js app | full-stack | 28.0 |
| Migrate callback-hell Express app to async/await | refactoring | 22.0 |
| Build RAG pipeline with vector search | backend | 0.0 |
| Fix broken responsive layout | frontend | 48.5 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 84.1 |
| Add Google OAuth2 login to Express app | full-stack | 50.4 |
| Build MCP server for database management | backend | 48.5 |
| Fix hallucination and context window bugs in RAG agent | backend | 50.0 |
| Fix race conditions in order matching engine | backend | 60.9 |
| Build SaaS admin dashboard from scratch | from-scratch | 50.3 |
| Build CLI tool with subcommands and config | from-scratch | 37.5 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 55.0 |
| Add retry logic and dead letter queue to Python task queue | backend | 77.4 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 82.9 |
| Dockerize Node.js monorepo | full-stack | 68.8 |
| Build materialized view refresh pipeline for analytics | backend | 50.4 |
| Build REST API from scratch | from-scratch | 49.6 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 46.1 |
| Refactor monolithic handler to CQRS | refactoring | 49.8 |
| Add file upload with S3 presigned URLs | backend | 48.5 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 81.3 |
| Convert React app to PWA with offline support | frontend | 80.8 |
| Build real-time portfolio risk calculator | backend | 47.3 |
| Add cursor-based pagination to REST API | backend | 46.9 |
| Write complex SQL report with window functions | backend | 57.5 |
| Replace console.log with structured logging | refactoring | 82.5 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 71.7 |
| Implement transformer inference engine with KV cache | from-scratch | 81.7 |
| Write integration tests for payment flow | code-review | 35.9 |
| Build LLM evaluation harness with structured grading | backend | 56.8 |
| Build production website with auth and members area | frontend | 38.5 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 87.3 |
| Debug and fix 6 broken database triggers and constraints | debugging | 90.8 |
| Port Python CLI to Rust | multi-language | 29.3 |
| Add slash commands and moderation to Discord bot | backend | 78.2 |
| Fix flaky test suite | debugging | 86.7 |
| Add rate limiting middleware | backend | 48.5 |
| Fix React hydration mismatch | frontend | 47.0 |
| Zero-downtime schema migration | full-stack | 86.5 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 76.5 |
| Build codebase indexer for LLM context windows | from-scratch | 36.5 |
| Add Redis caching layer to Express API | backend | 43.5 |
| Implement JWT auth middleware | backend | 53.0 |
| Code review: identify security vulns | code-review | 66.9 |
| Remove AI slop and over-engineering from codebase | refactoring | 86.7 |
| Build terminal UI dashboard | from-scratch | 48.5 |
| Add WebSocket real-time updates | full-stack | 53.3 |
| Optimize slow Postgres queries in Flask app | backend | 51.3 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 41.5 |
| Implement multi-tenant row-level security in Postgres | backend | 31.3 |
| Implement zero-trust API authentication layer | backend | 66.3 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 76.5 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 71.3 |
| Optimize bloated React bundle under 500KB | frontend | 59.1 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 72.3 |
| Replace console.log with structured logging | refactoring | 42.4 |
| Convert React app to PWA with offline support | frontend | 61.1 |
| Implement JWT auth middleware | backend | 82.9 |
| Build codebase indexer for LLM context windows | from-scratch | 22.1 |
| Split 1100-line god file into proper modules | refactoring | 28.0 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 36.5 |
| Remove AI slop and over-engineering from codebase | refactoring | 67.8 |
| Fix broken responsive layout | frontend | 53.7 |
| Add i18n with locale routing to Next.js app | full-stack | 50.3 |
| Dockerize Node.js monorepo | full-stack | 62.7 |
| Build CLI tool with subcommands and config | from-scratch | 32.7 |
| Build production website with auth and members area | frontend | 49.9 |
| Implement background job scheduler with persistence | backend | 41.5 |
| Build real-time portfolio risk calculator | backend | 57.4 |
| Build LLM evaluation harness with structured grading | backend | 55.3 |
| Implement transformer inference engine with KV cache | from-scratch | 52.0 |
| Fix hallucination and context window bugs in RAG agent | backend | 64.3 |
| Build SaaS admin dashboard from scratch | from-scratch | 40.3 |
| Build MCP server for database management | backend | 47.8 |
| Fix race conditions in order matching engine | backend | 65.2 |
| Write complex SQL report with window functions | backend | 63.1 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 51.9 |
| Fix deadlocking transaction patterns in Flask app | backend | 54.9 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 21.8 |
| Debug and fix 6 broken database triggers and constraints | debugging | 67.6 |
| Write tests for untested legacy Flask service | code-review | 47.9 |
| Optimize slow Postgres queries in Flask app | backend | 67.0 |
| Add Redis caching layer to Express API | backend | 69.2 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 72.5 |
| Add slash commands and moderation to Discord bot | backend | 27.7 |
| Write integration tests for payment flow | code-review | 58.1 |
| Add retry logic and dead letter queue to Python task queue | backend | 56.5 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 28.3 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 55.0 |
| Add GraphQL layer over REST API | multi-language | 41.0 |
| Build distributed node cluster with gossip protocol | from-scratch | 18.6 |
| Fix auth bypass vulnerability | debugging | 92.1 |
| Refactor monolithic handler to CQRS | refactoring | 45.3 |
| Implement Stripe webhook handler | backend | 39.8 |
| Zero-downtime schema migration | full-stack | 55.9 |
| Add rate limiting middleware | backend | 45.3 |
| Fix React hydration mismatch | frontend | 40.8 |
| Build terminal UI dashboard | from-scratch | 40.4 |
| Fix N+1 query in dashboard | backend | 48.8 |
| Build REST API from scratch | from-scratch | 79.1 |
| Fix memory leak in event handler | debugging | 63.5 |
| Debug race condition in worker pool | debugging | 67.9 |