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Qwen3.5 35b A3b [Q4_K_XL]
LM Studio
262K context<$0.01/M input<$0.01/M output
1246peak 1248
Avg Score
49.4
Avg Cost
$0.05
Score/$
928.7
Runs
105
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
from-scratchmedium
1710full-stackhard
1449from-scratchhard
1430debugginghard
1419backendeasy
1413debuggingexpert
1400from-scratch
1329debugging
1325multi-languagehard
1303multi-language
1299backendmedium
1287backendhard
1284full-stack
1280backend
1242frontendmedium
1230frontend
1149frontendexpert
1020code-review
973backendexpert
954code-reviewmedium
924multi-languageexpert
885refactoring
880refactoringmedium
856debuggingmedium
598full-stackmedium
310code-reviewhard
193from-scratcheasy
0refactoringexpert
0from-scratchexpert
0frontendhard
0frontendeasy
0All Results
| Task | Category | Score |
|---|---|---|
| Write tests for untested legacy Flask service | code-review | 36.3 |
| Add GraphQL layer over REST API | multi-language | — |
| Build MCP server for database management | backend | 66.5 |
| Implement Stripe webhook handler | backend | — |
| Write Kubernetes manifests for Node.js microservice | full-stack | 28.0 |
| Implement multi-tenant row-level security in Postgres | backend | 22.0 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 28.0 |
| Remove AI slop and over-engineering from codebase | refactoring | 28.0 |
| Add file upload with S3 presigned URLs | backend | 73.2 |
| Fix hallucination and context window bugs in RAG agent | backend | 66.3 |
| Split 1100-line god file into proper modules | refactoring | 28.0 |
| Debug race condition in worker pool | debugging | 28.0 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 28.0 |
| Build codebase indexer for LLM context windows | from-scratch | 49.5 |
| Convert React app to PWA with offline support | frontend | 28.0 |
| Fix memory leak in event handler | debugging | — |
| Fix deadlocking transaction patterns in Flask app | backend | 22.0 |
| Build terminal UI dashboard | from-scratch | 65.5 |
| Fix Node.js stream backpressure causing OOM on large files | backend | — |
| Build real-time portfolio risk calculator | backend | 52.0 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 28.0 |
| Add retry logic and dead letter queue to Python task queue | backend | 28.0 |
| Add Google OAuth2 login to Express app | full-stack | 68.4 |
| Optimize slow Postgres queries in Flask app | backend | 28.0 |
| Migrate callback-hell Express app to async/await | refactoring | 28.0 |
| Add Redis caching layer to Express API | backend | — |
| Build SaaS admin dashboard from scratch | from-scratch | 56.5 |
| Implement transformer inference engine with KV cache | from-scratch | 28.0 |
| Debug and fix 6 broken database triggers and constraints | debugging | 82.0 |
| Implement background job scheduler with persistence | backend | 31.3 |
| Code review: identify security vulns | code-review | 28.0 |
| Build distributed node cluster with gossip protocol | from-scratch | 45.8 |
| Fix flaky test suite | debugging | 28.0 |
| Build REST API from scratch | from-scratch | 22.0 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 28.0 |
| Build LLM evaluation harness with structured grading | backend | 28.0 |
| Fix N+1 query in dashboard | backend | 50.0 |
| Optimize bloated React bundle under 500KB | frontend | 28.0 |
| Fix race conditions in order matching engine | backend | 22.0 |
| Implement zero-trust API authentication layer | backend | 44.9 |
| Dockerize Node.js monorepo | full-stack | 28.0 |
| Fix broken responsive layout | frontend | 22.0 |
| Add i18n with locale routing to Next.js app | full-stack | 28.0 |
| Build production website with auth and members area | frontend | 58.6 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 81.7 |
| Fix auth bypass vulnerability | debugging | — |
| Refactor monolithic handler to CQRS | refactoring | 46.2 |
| Fix broken GitHub Actions CI pipeline | debugging | 55.9 |
| Write complex SQL report with window functions | backend | 61.9 |
| Implement JWT auth middleware | backend | 78.5 |
| Zero-downtime schema migration | full-stack | 90.0 |
| Build CLI tool with subcommands and config | from-scratch | 67.5 |
| Port Python CLI to Rust | multi-language | 41.5 |
| Add slash commands and moderation to Discord bot | backend | 68.0 |
| Add streaming SSE endpoint for LLM chat | backend | 66.4 |
| Add rate limiting middleware | backend | 69.4 |
| Add WebSocket real-time updates | full-stack | 73.8 |
| Write integration tests for payment flow | code-review | 46.0 |
| Replace console.log with structured logging | refactoring | 42.3 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 42.5 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 87.4 |
| Fix React hydration mismatch | frontend | 50.0 |
| Build RAG pipeline with vector search | backend | 44.5 |
| Build materialized view refresh pipeline for analytics | backend | 83.1 |
| Add cursor-based pagination to REST API | backend | 42.0 |
| Build MCP server for database management | backend | 54.0 |
| Implement transformer inference engine with KV cache | from-scratch | 58.7 |
| Build SaaS admin dashboard from scratch | from-scratch | 51.8 |
| Implement background job scheduler with persistence | backend | 28.7 |
| Build production website with auth and members area | frontend | 53.5 |
| Build CLI tool with subcommands and config | from-scratch | 3.3 |
| Fix hallucination and context window bugs in RAG agent | backend | 45.0 |
| Build LLM evaluation harness with structured grading | backend | 37.7 |
| Build real-time portfolio risk calculator | backend | 47.0 |
| Fix race conditions in order matching engine | backend | 81.9 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 54.9 |
| Build materialized view refresh pipeline for analytics | backend | 47.9 |
| Fix deadlocking transaction patterns in Flask app | backend | 46.3 |
| Debug and fix 6 broken database triggers and constraints | debugging | 52.1 |
| Write complex SQL report with window functions | backend | 44.0 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 89.0 |
| Add Redis caching layer to Express API | backend | 69.2 |
| Write tests for untested legacy Flask service | code-review | 50.1 |
| Optimize slow Postgres queries in Flask app | backend | 74.4 |
| Add slash commands and moderation to Discord bot | backend | 36.6 |
| Add retry logic and dead letter queue to Python task queue | backend | 66.8 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 73.8 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 74.1 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 68.8 |
| Build distributed node cluster with gossip protocol | from-scratch | 24.8 |
| Fix auth bypass vulnerability | debugging | 92.3 |
| Add GraphQL layer over REST API | multi-language | 69.8 |
| Write integration tests for payment flow | code-review | 41.7 |
| Zero-downtime schema migration | full-stack | 48.0 |
| Add rate limiting middleware | backend | 66.1 |
| Implement Stripe webhook handler | backend | 45.3 |
| Fix flaky test suite | debugging | 41.0 |
| Add cursor-based pagination to REST API | backend | 34.5 |
| Fix N+1 query in dashboard | backend | 36.8 |
| Fix memory leak in event handler | debugging | 56.7 |
| Refactor monolithic handler to CQRS | refactoring | 31.8 |
| Debug race condition in worker pool | debugging | 88.5 |
| Fix React hydration mismatch | frontend | 72.5 |
| Build terminal UI dashboard | from-scratch | 28.7 |
| Build REST API from scratch | from-scratch | 77.9 |