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Grok 4
OpenRouter
256K context$3.00/M input$15.00/M output
1511peak 1526
Avg Score
71.5
Avg Cost
$0.33
Score/$
216.9
Runs
65
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
backendeasy
2195from-scratchexpert
2105code-reviewhard
2016debuggingexpert
1776from-scratchmedium
1674backendmedium
1647full-stackmedium
1636debuggingmedium
1624debugging
1575from-scratch
1565backend
1549multi-languagehard
1539from-scratchhard
1522frontendeasy
1519full-stack
1516from-scratcheasy
1512frontendmedium
1499backendexpert
1487debugginghard
1475code-review
1462backendhard
1446refactoringmedium
1438refactoring
1431full-stackhard
1423frontend
1408code-reviewmedium
1382multi-language
1342refactoringexpert
1129frontendhard
866multi-languageexpert
843frontendexpert
744All Results
| Task | Category | Score |
|---|---|---|
| Implement background job scheduler with persistence | backend | 66.8 |
| Build production website with auth and members area | frontend | 56.6 |
| Fix N+1 query in dashboard | backend | 73.7 |
| Port Python CLI to Rust | multi-language | 44.3 |
| Debug and fix 6 broken database triggers and constraints | debugging | 93.0 |
| Fix race conditions in order matching engine | backend | 80.4 |
| Add slash commands and moderation to Discord bot | backend | 79.3 |
| Add i18n with locale routing to Next.js app | full-stack | 69.7 |
| Add file upload with S3 presigned URLs | backend | 84.4 |
| Fix broken responsive layout | frontend | 68.4 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 89.0 |
| Fix hallucination and context window bugs in RAG agent | backend | 63.0 |
| Refactor monolithic handler to CQRS | refactoring | 57.4 |
| Debug race condition in worker pool | debugging | 85.5 |
| Add GraphQL layer over REST API | multi-language | 77.3 |
| Fix broken GitHub Actions CI pipeline | debugging | 80.0 |
| Remove AI slop and over-engineering from codebase | refactoring | 73.0 |
| Code review: identify security vulns | code-review | 76.2 |
| Replace console.log with structured logging | refactoring | 57.6 |
| Implement multi-tenant row-level security in Postgres | backend | 72.6 |
| Add cursor-based pagination to REST API | backend | 72.5 |
| Add Google OAuth2 login to Express app | full-stack | 76.7 |
| Optimize slow Postgres queries in Flask app | backend | 80.0 |
| Fix deadlocking transaction patterns in Flask app | backend | 64.6 |
| Add Redis caching layer to Express API | backend | 78.5 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 89.1 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 88.4 |
| Implement transformer inference engine with KV cache | from-scratch | 88.8 |
| Add streaming SSE endpoint for LLM chat | backend | 84.0 |
| Write integration tests for payment flow | code-review | 82.5 |
| Build MCP server for database management | backend | 77.8 |
| Add retry logic and dead letter queue to Python task queue | backend | 79.0 |
| Implement Stripe webhook handler | backend | 83.6 |
| Migrate callback-hell Express app to async/await | refactoring | 56.8 |
| Build real-time portfolio risk calculator | backend | 50.0 |
| Dockerize Node.js monorepo | full-stack | 73.0 |
| Write complex SQL report with window functions | backend | 69.9 |
| Convert React app to PWA with offline support | frontend | 71.1 |
| Add WebSocket real-time updates | full-stack | 72.6 |
| Zero-downtime schema migration | full-stack | 74.1 |
| Build RAG pipeline with vector search | backend | 53.8 |
| Fix React hydration mismatch | frontend | 73.1 |
| Fix flaky test suite | debugging | 93.2 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 91.6 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 78.3 |
| Build codebase indexer for LLM context windows | from-scratch | 53.8 |
| Fix memory leak in event handler | debugging | 74.4 |
| Split 1100-line god file into proper modules | refactoring | 41.0 |
| Fix auth bypass vulnerability | debugging | 71.3 |
| Build CLI tool with subcommands and config | from-scratch | 60.5 |
| Build distributed node cluster with gossip protocol | from-scratch | 44.7 |
| Build LLM evaluation harness with structured grading | backend | 81.0 |
| Build terminal UI dashboard | from-scratch | 54.7 |
| Add rate limiting middleware | backend | 89.8 |
| Build REST API from scratch | from-scratch | 78.1 |
| Build materialized view refresh pipeline for analytics | backend | 75.5 |
| Implement JWT auth middleware | backend | 47.7 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 87.0 |
| Build SaaS admin dashboard from scratch | from-scratch | 56.5 |
| Write tests for untested legacy Flask service | code-review | 36.3 |
| Optimize bloated React bundle under 500KB | frontend | 79.1 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 63.1 |
| Implement zero-trust API authentication layer | backend | 70.1 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 58.0 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 71.3 |