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Qwen3.5 397b A17b Q4 K XL [Q4_K_XL]
LM Studio
262K context<$0.01/M input<$0.01/M output
1476peak 1636
Avg Score
74.8
Avg Cost
$0.87
Score/$
85.8
Runs
70
Win/Loss/Draw
Scoring Dimensions
Score Distribution
Category ELOs
from-scratcheasy
1869frontendexpert
1837from-scratchhard
1828from-scratchmedium
1748backendeasy
1732from-scratch
1650full-stackmedium
1596frontendeasy
1529debuggingmedium
1528backendhard
1526refactoring
1524refactoringexpert
1518refactoringmedium
1513frontendmedium
1508frontend
1501multi-languagehard
1499debuggingexpert
1489full-stack
1480code-reviewmedium
1462backendexpert
1459multi-languageexpert
1455backend
1446multi-language
1444debugging
1433frontendmaster
1423full-stackhard
1385debugginghard
1383code-review
1367backendmedium
1352backendmaster
1270frontendhard
1267from-scratchexpert
897code-reviewhard
309All Results
| Task | Category | Score |
|---|---|---|
| Fix and extend Chrome browser extension | frontend | 49.0 |
| Implement JWT auth middleware | backend | 77.5 |
| Add WebSocket real-time updates | full-stack | 84.3 |
| Zero-downtime schema migration | full-stack | 66.8 |
| Add Google OAuth2 login to Express app | full-stack | 65.7 |
| Write integration tests for payment flow | code-review | 57.4 |
| Add i18n with locale routing to Next.js app | full-stack | 68.0 |
| Optimize bloated React bundle under 500KB | frontend | 76.0 |
| Add caching layer to eliminate slow SSR page loads | full-stack | 83.8 |
| Build RAG pipeline with vector search | backend | 56.1 |
| Build LLM evaluation harness with structured grading | backend | 64.8 |
| Implement zero-trust API authentication layer | backend | 53.6 |
| Build distributed node cluster with gossip protocol | from-scratch | 78.9 |
| Fix auth bypass vulnerability | debugging | 77.7 |
| Add cursor-based pagination to REST API | backend | 72.2 |
| Migrate callback-hell Express app to async/await | refactoring | 83.0 |
| Implement transformer inference engine with KV cache | from-scratch | 69.9 |
| Fix memory leak in event handler | debugging | 65.0 |
| Implement multi-tenant row-level security in Postgres | backend | 78.5 |
| Fix deadlocking transaction patterns in Flask app | backend | 61.2 |
| Fix Node.js stream backpressure causing OOM on large files | backend | 78.7 |
| Fix broken responsive layout | frontend | 77.4 |
| Migrate Express monolith to modular architecture | backend | 62.5 |
| Add file upload with S3 presigned URLs | backend | 66.6 |
| Build interactive data visualization dashboard | frontend | 73.0 |
| Convert React app to PWA with offline support | frontend | 75.2 |
| Build MCP server for database management | backend | 82.4 |
| Replace console.log with structured logging | refactoring | 75.7 |
| Add slash commands and moderation to Discord bot | backend | 76.8 |
| Add GraphQL layer over REST API | multi-language | 76.2 |
| Write complex SQL report with window functions | backend | 87.5 |
| Add Redis caching layer to Express API | backend | 77.7 |
| Fix N+1 query in dashboard | backend | 63.7 |
| Write tests for untested legacy Flask service | code-review | 81.3 |
| Add virtual scrolling to table rendering 5000 rows | frontend | 82.3 |
| Build terminal UI dashboard | from-scratch | 71.2 |
| Build production website with auth and members area | frontend | 74.0 |
| Build multi-tool LLM agent runtime | backend | 77.8 |
| Build 3D browser game with physics and multiplayer sync | frontend | 78.7 |
| Split 1100-line god file into proper modules | refactoring | 72.7 |
| Fix 12 WCAG accessibility violations in checkout form | frontend | 76.2 |
| Add retry logic and dead letter queue to Python task queue | backend | 71.9 |
| Write Kubernetes manifests for Node.js microservice | full-stack | 87.7 |
| Code review: identify security vulns | code-review | 74.7 |
| Fix flaky test suite | debugging | 86.8 |
| Port Python CLI to Rust | multi-language | 57.5 |
| Fix data integrity bugs in denormalized e-commerce schema | debugging | 74.2 |
| Build real-time portfolio risk calculator | backend | 81.7 |
| Implement Stripe webhook handler | backend | 67.2 |
| Build codebase indexer for LLM context windows | from-scratch | 70.9 |
| Build materialized view refresh pipeline for analytics | backend | 78.5 |
| Find and patch all OWASP Top 10 vulnerabilities | debugging | 75.8 |
| Add streaming SSE endpoint for LLM chat | backend | 60.0 |
| Fix broken GitHub Actions CI pipeline | debugging | 80.3 |
| Add rate limiting middleware | backend | 80.3 |
| Build SaaS admin dashboard from scratch | from-scratch | 83.3 |
| Implement background job scheduler with persistence | backend | 70.8 |
| Fix hallucination and context window bugs in RAG agent | backend | 76.3 |
| Remove AI slop and over-engineering from codebase | refactoring | 82.2 |
| Refactor monolithic handler to CQRS | refactoring | 73.3 |
| Harden insecure Docker setup with 12 vulnerabilities | code-review | 77.0 |
| Dockerize Node.js monorepo | full-stack | 79.3 |
| Optimize slow Postgres queries in Flask app | backend | 76.8 |
| Fix React hydration mismatch | frontend | 75.7 |
| Find and fix 4 hidden backdoors in Flask app | debugging | 89.7 |
| Fix race conditions in order matching engine | backend | 87.5 |
| Debug and fix 6 broken database triggers and constraints | debugging | 86.8 |
| Debug race condition in worker pool | debugging | 84.5 |
| Build CLI tool with subcommands and config | from-scratch | 78.5 |
| Build REST API from scratch | from-scratch | 89.3 |