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Grok 4.1 Fast
OpenRouter
2000K context$0.20/M input$0.50/M output
1570peak 1601
Avg Score
68.3
Avg Cost
$0.05
Score/$
1426.0
Runs
118
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
from-scratchmedium
1870code-reviewhard
1820debuggingexpert
1784from-scratcheasy
1773debugginghard
1703multi-languagehard
1680debugging
1675debuggingmedium
1647full-stackhard
1631frontendhard
1622backendeasy
1620frontendexpert
1616backendexpert
1614from-scratch
1611frontendmedium
1600from-scratchhard
1596backendhard
1594backend
1582backendmedium
1581frontend
1573full-stack
1560frontendeasy
1555full-stackmedium
1516code-review
1510code-reviewmedium
1471from-scratchexpert
1449refactoringmedium
1439refactoring
1433refactoringexpert
1376multi-language
1348multi-languageexpert
327All Results
| Task | Category | Score |
|---|---|---|
| Implement background job scheduler with persistence | backend | 3.9 |
| Build SaaS admin dashboard from scratch | from-scratch | 23.8 |
| Build CLI tool with subcommands and config | from-scratch | 6.3 |
| Fix N+1 query in dashboard | backend | 63.5 |
| Fix flaky test suite | debugging | 93.2 |
| Debug and fix 6 broken database triggers and constraints | debugging | 90.8 |
| Write complex SQL report with window functions | backend | 70.5 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 69.7 |
| Dockerize Node.js monorepo | full-stack | 71.1 |
| Optimize slow Postgres queries in Flask app | backend | 82.0 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 93.5 |
| Add i18n with locale routing to Next.js app | full-stack | 64.7 |
| Implement JWT auth middleware | backend | 45.1 |
| Build real-time portfolio risk calculator | backend | 64.0 |
| Code review: identify security vulns | code-review | 82.9 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 89.3 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 87.5 |
| Fix React hydration mismatch | frontend | 78.3 |
| Build terminal UI dashboard | from-scratch | 66.3 |
| Write integration tests for payment flow | code-review | 40.7 |
| Add Google OAuth2 login to Express app | full-stack | 82.5 |
| Add slash commands and moderation to Discord bot | backend | 63.4 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 80.1 |
| Write tests for untested legacy Flask service | code-review | 35.0 |
| Build REST API from scratch | from-scratch | 60.9 |
| Fix broken GitHub Actions CI pipeline | debugging | 74.5 |
| Fix hallucination and context window bugs in RAG agent | backend | 86.4 |
| Add rate limiting middleware | backend | 74.0 |
| Build distributed node cluster with gossip protocol | from-scratch | 29.0 |
| Implement transformer inference engine with KV cache | from-scratch | 70.8 |
| Add Redis caching layer to Express API | backend | 62.4 |
| Build materialized view refresh pipeline for analytics | backend | 54.5 |
| Port Python CLI to Rust | multi-language | 41.0 |
| Implement zero-trust API authentication layer | backend | 32.5 |
| Build MCP server for database management | backend | 88.2 |
| Convert React app to PWA with offline support | frontend | 71.8 |
| Fix broken responsive layout | frontend | 75.3 |
| Replace console.log with structured logging | refactoring | 62.7 |
| Fix memory leak in event handler | debugging | 75.6 |
| Add WebSocket real-time updates | full-stack | 67.3 |
| Add cursor-based pagination to REST API | backend | 70.8 |
| Add retry logic and dead letter queue to Python task queue | backend | 81.3 |
| Build codebase indexer for LLM context windows | from-scratch | 38.2 |
| Build production website with auth and members area | frontend | 60.5 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 74.7 |
| Implement Stripe webhook handler | backend | 77.5 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 57.1 |
| Add GraphQL layer over REST API | multi-language | 75.8 |
| Remove AI slop and over-engineering from codebase | refactoring | 68.9 |
| Add streaming SSE endpoint for LLM chat | backend | 84.4 |
| Migrate callback-hell Express app to async/await | refactoring | 54.9 |
| Add file upload with S3 presigned URLs | backend | 82.5 |
| Split 1100-line god file into proper modules | refactoring | 58.1 |
| Refactor monolithic handler to CQRS | refactoring | 57.4 |
| Debug race condition in worker pool | debugging | 93.7 |
| Build RAG pipeline with vector search | backend | 31.4 |
| Fix race conditions in order matching engine | backend | 78.1 |
| Fix deadlocking transaction patterns in Flask app | backend | 68.8 |
| Fix auth bypass vulnerability | debugging | 71.7 |
| Implement multi-tenant row-level security in Postgres | backend | 42.3 |
| Optimize bloated React bundle under 500KB | frontend | 76.2 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 77.6 |
| Zero-downtime schema migration | full-stack | 73.0 |
| Build LLM evaluation harness with structured grading | backend | 79.5 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 43.0 |
| Implement JWT auth middleware | backend | 75.7 |
| Dockerize Node.js monorepo | full-stack | 30.6 |
| Convert React app to PWA with offline support | frontend | 64.7 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 85.3 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 79.3 |
| Build codebase indexer for LLM context windows | from-scratch | 35.0 |
| Implement multi-tenant row-level security in Postgres | backend | 74.0 |
| Add i18n with locale routing to Next.js app | full-stack | 62.4 |
| Remove AI slop and over-engineering from codebase | refactoring | 77.0 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 72.0 |
| Split 1100-line god file into proper modules | refactoring | 74.2 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 89.7 |
| Optimize bloated React bundle under 500KB | frontend | 67.2 |
| Fix broken responsive layout | frontend | 72.3 |
| Replace console.log with structured logging | refactoring | 51.5 |
| Implement zero-trust API authentication layer | backend | 71.8 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 71.7 |
| Build MCP server for database management | backend | 76.2 |
| Build CLI tool with subcommands and config | from-scratch | 40.0 |
| Zero-downtime schema migration | full-stack | 84.0 |
| Write complex SQL report with window functions | backend | 74.5 |
| Build real-time portfolio risk calculator | backend | 64.2 |
| Build distributed node cluster with gossip protocol | from-scratch | 74.9 |
| Optimize slow Postgres queries in Flask app | backend | 76.7 |
| Debug and fix 6 broken database triggers and constraints | debugging | 86.7 |
| Build terminal UI dashboard | from-scratch | 47.7 |
| Implement background job scheduler with persistence | backend | 54.0 |
| Build LLM evaluation harness with structured grading | backend | 73.6 |
| Add cursor-based pagination to REST API | backend | 82.8 |
| Write integration tests for payment flow | code-review | 69.3 |
| Build REST API from scratch | from-scratch | 85.8 |
| Fix hallucination and context window bugs in RAG agent | backend | 72.9 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 92.5 |
| Add rate limiting middleware | backend | 76.2 |
| Build production website with auth and members area | frontend | 65.2 |
| Build SaaS admin dashboard from scratch | from-scratch | 74.0 |
| Write tests for untested legacy Flask service | code-review | 38.8 |
| Fix React hydration mismatch | frontend | 76.3 |
| Implement Stripe webhook handler | backend | 59.5 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 78.8 |
| Fix memory leak in event handler | debugging | 80.3 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 90.8 |
| Fix N+1 query in dashboard | backend | 75.2 |
| Add slash commands and moderation to Discord bot | backend | 77.5 |
| Fix auth bypass vulnerability | debugging | 92.5 |
| Add retry logic and dead letter queue to Python task queue | backend | 73.6 |
| Fix flaky test suite | debugging | 82.8 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 82.1 |
| Fix race conditions in order matching engine | backend | 82.2 |
| Implement transformer inference engine with KV cache | from-scratch | 78.2 |
| Debug race condition in worker pool | debugging | 84.3 |
| Refactor monolithic handler to CQRS | refactoring | 60.6 |
| Fix deadlocking transaction patterns in Flask app | backend | 69.2 |