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Qwen3 Coder Next
OpenRouter
262K context$0.07/M input$0.30/M output
1388peak 1399
Avg Score
60.9
Avg Cost
$0.11
Score/$
530.7
Runs
122
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
backendeasy
1985multi-languagehard
1979debuggingmedium
1772from-scratchexpert
1658frontendeasy
1538debugging
1529debugginghard
1514debuggingexpert
1509refactoringmedium
1463frontend
1447frontendmedium
1439refactoring
1437multi-language
1436backendhard
1400frontendhard
1386backend
1371frontendexpert
1339full-stackmedium
1325backendmedium
1324full-stack
1308backendexpert
1307full-stackhard
1285from-scratch
1280from-scratcheasy
1275from-scratchhard
1251code-review
1186from-scratchmedium
1151multi-languageexpert
1147code-reviewmedium
1117code-reviewhard
966refactoringexpert
329All Results
| Task | Category | Score |
|---|---|---|
| Write tests for untested legacy Flask service | code-review | 39.0 |
| Implement transformer inference engine with KV cache | from-scratch | 77.3 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 89.8 |
| Debug race condition in worker pool | debugging | 88.3 |
| Fix N+1 query in dashboard | backend | 44.4 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 84.8 |
| Build REST API from scratch | from-scratch | 55.3 |
| Add retry logic and dead letter queue to Python task queue | backend | 73.6 |
| Add rate limiting middleware | backend | 39.0 |
| Remove AI slop and over-engineering from codebase | refactoring | 72.0 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 79.2 |
| Add GraphQL layer over REST API | multi-language | 80.5 |
| Write complex SQL report with window functions | backend | 76.3 |
| Fix memory leak in event handler | debugging | 75.2 |
| Build MCP server for database management | backend | 51.9 |
| Build terminal UI dashboard | from-scratch | 48.5 |
| Build real-time portfolio risk calculator | backend | 41.5 |
| Fix broken GitHub Actions CI pipeline | debugging | 87.5 |
| Fix race conditions in order matching engine | backend | 75.7 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 72.2 |
| Fix flaky test suite | debugging | 84.3 |
| Add Redis caching layer to Express API | backend | 81.7 |
| Build CLI tool with subcommands and config | from-scratch | 32.9 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 64.2 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 78.0 |
| Implement background job scheduler with persistence | backend | 32.0 |
| Refactor monolithic handler to CQRS | refactoring | 37.2 |
| Add file upload with S3 presigned URLs | backend | 64.9 |
| Dockerize Node.js monorepo | full-stack | 67.2 |
| Build SaaS admin dashboard from scratch | from-scratch | 37.5 |
| Debug and fix 6 broken database triggers and constraints | debugging | 88.3 |
| Fix auth bypass vulnerability | debugging | 84.4 |
| Add cursor-based pagination to REST API | backend | 71.7 |
| Fix hallucination and context window bugs in RAG agent | backend | 56.1 |
| Split 1100-line god file into proper modules | refactoring | 62.1 |
| Fix broken responsive layout | frontend | 65.0 |
| Add WebSocket real-time updates | full-stack | 52.2 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 77.5 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 63.4 |
| Build production website with auth and members area | frontend | 55.3 |
| Optimize bloated React bundle under 500KB | frontend | 69.6 |
| Add Google OAuth2 login to Express app | full-stack | 78.1 |
| Build distributed node cluster with gossip protocol | from-scratch | 19.6 |
| Build LLM evaluation harness with structured grading | backend | 54.4 |
| Write integration tests for payment flow | code-review | 49.0 |
| Optimize slow Postgres queries in Flask app | backend | 73.3 |
| Fix React hydration mismatch | frontend | 81.3 |
| Zero-downtime schema migration | full-stack | 47.4 |
| Build materialized view refresh pipeline for analytics | backend | 75.2 |
| Build codebase indexer for LLM context windows | from-scratch | 42.7 |
| Code review: identify security vulns | code-review | 50.1 |
| Port Python CLI to Rust | multi-language | 33.5 |
| Convert React app to PWA with offline support | frontend | 69.7 |
| Add streaming SSE endpoint for LLM chat | backend | 30.8 |
| Build RAG pipeline with vector search | backend | 46.9 |
| Replace console.log with structured logging | refactoring | 45.2 |
| Add i18n with locale routing to Next.js app | full-stack | 57.0 |
| Implement Stripe webhook handler | backend | 75.6 |
| Fix deadlocking transaction patterns in Flask app | backend | 68.8 |
| Implement zero-trust API authentication layer | backend | 69.1 |
| Migrate callback-hell Express app to async/await | refactoring | 61.6 |
| Implement JWT auth middleware | backend | 52.4 |
| Implement multi-tenant row-level security in Postgres | backend | 27.3 |
| Add slash commands and moderation to Discord bot | backend | 46.4 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 82.8 |
| Convert React app to PWA with offline support | frontend | 66.8 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 66.8 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 76.9 |
| Split 1100-line god file into proper modules | refactoring | 55.8 |
| Implement multi-tenant row-level security in Postgres | backend | 65.3 |
| Replace console.log with structured logging | refactoring | 46.6 |
| Optimize bloated React bundle under 500KB | frontend | 60.9 |
| Add i18n with locale routing to Next.js app | full-stack | 55.6 |
| Build codebase indexer for LLM context windows | from-scratch | 34.5 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 73.8 |
| Dockerize Node.js monorepo | full-stack | 58.5 |
| Implement zero-trust API authentication layer | backend | 57.5 |
| Remove AI slop and over-engineering from codebase | refactoring | 87.9 |
| Add file upload with S3 presigned URLs | backend | 58.3 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 72.9 |
| Implement JWT auth middleware | backend | 50.5 |
| Fix broken responsive layout | frontend | 74.7 |
| Implement background job scheduler with persistence | backend | 47.0 |
| Build production website with auth and members area | frontend | 60.5 |
| Build SaaS admin dashboard from scratch | from-scratch | 64.9 |
| Build MCP server for database management | backend | 74.3 |
| Implement transformer inference engine with KV cache | from-scratch | 61.5 |
| Build CLI tool with subcommands and config | from-scratch | 36.0 |
| Fix deadlocking transaction patterns in Flask app | backend | 59.9 |
| Write complex SQL report with window functions | backend | 73.9 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 44.0 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 60.2 |
| Fix flaky test suite | debugging | 50.8 |
| Add Redis caching layer to Express API | backend | 43.0 |
| Fix N+1 query in dashboard | backend | 39.5 |
| Debug race condition in worker pool | debugging | 83.4 |
| Debug and fix 6 broken database triggers and constraints | debugging | 58.2 |
| Write integration tests for payment flow | code-review | 53.6 |
| Build real-time portfolio risk calculator | backend | 48.9 |
| Fix race conditions in order matching engine | backend | 73.7 |
| Add cursor-based pagination to REST API | backend | 58.0 |
| Add retry logic and dead letter queue to Python task queue | backend | 63.1 |
| Zero-downtime schema migration | full-stack | 59.9 |
| Refactor monolithic handler to CQRS | refactoring | 36.5 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 71.2 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 79.5 |
| Add Google OAuth2 login to Express app | full-stack | 62.4 |
| Build distributed node cluster with gossip protocol | from-scratch | 16.9 |
| Add rate limiting middleware | backend | 83.2 |
| Build REST API from scratch | from-scratch | 76.5 |
| Write tests for untested legacy Flask service | code-review | 19.3 |
| Fix hallucination and context window bugs in RAG agent | backend | 50.8 |
| Add slash commands and moderation to Discord bot | backend | 71.8 |
| Code review: identify security vulns | code-review | 32.0 |
| Build terminal UI dashboard | from-scratch | 36.0 |
| Fix React hydration mismatch | frontend | 78.5 |
| Implement Stripe webhook handler | backend | 59.5 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 73.9 |
| Build materialized view refresh pipeline for analytics | backend | 71.3 |
| Fix auth bypass vulnerability | debugging | 92.9 |
| Fix memory leak in event handler | debugging | 56.0 |
| Optimize slow Postgres queries in Flask app | backend | 69.7 |