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Grok Code Fast 1
OpenRouter
256K context$0.20/M input$1.50/M output
1381peak 1409
Avg Score
65.4
Avg Cost
$0.02
Score/$
4068.1
Runs
65
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
from-scratchexpert
2086frontendhard
1547frontendeasy
1519debugginghard
1473backendmedium
1456frontendmedium
1433code-reviewhard
1433frontend
1429backend
1416debuggingmedium
1409backendhard
1400debugging
1399full-stackmedium
1397backendexpert
1390multi-languagehard
1385full-stack
1339code-review
1336from-scratch
1328backendeasy
1322refactoringmedium
1316debuggingexpert
1312refactoring
1307code-reviewmedium
1304full-stackhard
1273from-scratchhard
1214multi-language
1192frontendexpert
994from-scratchmedium
992from-scratcheasy
968refactoringexpert
704multi-languageexpert
278All Results
| Task | Category | Score |
|---|---|---|
| Build REST API from scratch | from-scratch | 74.6 |
| Add rate limiting middleware | backend | 37.3 |
| Build real-time portfolio risk calculator | backend | 45.5 |
| Fix React hydration mismatch | frontend | 72.4 |
| Split 1100-line god file into proper modules | refactoring | 65.2 |
| Add i18n with locale routing to Next.js app | full-stack | 67.2 |
| Add cursor-based pagination to REST API | backend | 76.5 |
| Implement zero-trust API authentication layer | backend | 72.8 |
| Port Python CLI to Rust | multi-language | 34.3 |
| Implement multi-tenant row-level security in Postgres | backend | 37.9 |
| Add GraphQL layer over REST API | multi-language | 74.9 |
| Build distributed node cluster with gossip protocol | from-scratch | 42.3 |
| Write complex SQL report with window functions | backend | 81.9 |
| Fix race conditions in order matching engine | backend | 87.4 |
| Replace console.log with structured logging | refactoring | 55.5 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 73.3 |
| Fix N+1 query in dashboard | backend | 57.2 |
| Code review: identify security vulns | code-review | 76.5 |
| Build CLI tool with subcommands and config | from-scratch | 35.6 |
| Add streaming SSE endpoint for LLM chat | backend | 77.9 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 73.8 |
| Zero-downtime schema migration | full-stack | 69.3 |
| Write tests for untested legacy Flask service | code-review | 44.5 |
| Optimize bloated React bundle under 500KB | frontend | 65.2 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 79.0 |
| Fix broken GitHub Actions CI pipeline | debugging | 83.6 |
| Fix auth bypass vulnerability | debugging | 82.2 |
| Convert React app to PWA with offline support | frontend | 69.5 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 86.3 |
| Dockerize Node.js monorepo | full-stack | 68.0 |
| Migrate callback-hell Express app to async/await | refactoring | 57.9 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 73.0 |
| Implement JWT auth middleware | backend | 50.0 |
| Build materialized view refresh pipeline for analytics | backend | 72.0 |
| Debug and fix 6 broken database triggers and constraints | debugging | 62.6 |
| Add Google OAuth2 login to Express app | full-stack | 64.2 |
| Build production website with auth and members area | frontend | 59.9 |
| Optimize slow Postgres queries in Flask app | backend | 65.5 |
| Build codebase indexer for LLM context windows | from-scratch | 47.9 |
| Fix broken responsive layout | frontend | 76.6 |
| Add Redis caching layer to Express API | backend | 82.5 |
| Add WebSocket real-time updates | full-stack | 69.8 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 72.3 |
| Add retry logic and dead letter queue to Python task queue | backend | 73.9 |
| Add slash commands and moderation to Discord bot | backend | 68.8 |
| Fix memory leak in event handler | debugging | 72.0 |
| Build terminal UI dashboard | from-scratch | 44.7 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 65.9 |
| Add file upload with S3 presigned URLs | backend | 75.5 |
| Build RAG pipeline with vector search | backend | 44.0 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 80.5 |
| Remove AI slop and over-engineering from codebase | refactoring | 77.3 |
| Fix flaky test suite | debugging | 69.7 |
| Refactor monolithic handler to CQRS | refactoring | 35.6 |
| Implement Stripe webhook handler | backend | 85.6 |
| Fix hallucination and context window bugs in RAG agent | backend | 69.1 |
| Build SaaS admin dashboard from scratch | from-scratch | 36.8 |
| Build MCP server for database management | backend | 53.6 |
| Implement background job scheduler with persistence | backend | 46.0 |
| Fix deadlocking transaction patterns in Flask app | backend | 69.9 |
| Implement transformer inference engine with KV cache | from-scratch | 78.3 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 78.2 |
| Debug race condition in worker pool | debugging | 90.7 |
| Build LLM evaluation harness with structured grading | backend | 49.5 |
| Write integration tests for payment flow | code-review | 65.5 |