Qwen3 Coder Flash

OpenRouter

1000K context$0.30/M input$1.50/M output

998peak 1202

Avg Score

59.5

Avg Cost

$0.01

Score/$

4866.3

Runs

Win/Loss/Draw

Scoring Dimensions

Score Distribution

Category ELOs

code-reviewhard

1909

from-scratchexpert

1460

backendmedium

1421

frontendmedium

1365

full-stackhard

1355

code-review

1354

full-stack

1351

full-stackmedium

1322

backend

1308

frontend

1282

debugginghard

1257

backendexpert

1254

code-reviewmedium

1230

debugging

1213

refactoring

1196

backendhard

1190

refactoringmedium

1188

debuggingexpert

1165

multi-languagehard

1134

from-scratch

1129

multi-language

1095

debuggingmedium

1050

from-scratchhard

1047

frontendeasy

1032

frontendhard

1030

from-scratcheasy

695

refactoringexpert

606

from-scratchmedium

544

frontendexpert

488

backendeasy

245

multi-languageexpert

175

All Results

Task	Category	Score	Duration	Cost
Fix 12 WCAG accessibility violations in checkout form	frontend	52.3	3m 18s	$0.03
Build SaaS admin dashboard from scratch	from-scratch	51.5	2m 53s	$0.02
Build materialized view refresh pipeline for analytics	backend	60.4	1m 25s	<$0.01
Fix React hydration mismatch	frontend	85.9	48.0s	$0.02
Port Python CLI to Rust	multi-language	33.0	36.8s	<$0.01
Implement JWT auth middleware	backend	38.8	34.8s	$0.02
Migrate callback-hell Express app to async/await	refactoring	62.7	1m 5s	$0.01
Implement zero-trust API authentication layer	backend	65.0	1m 31s	$0.01
Fix N+1 query in dashboard	backend	44.4	13.2s	<$0.01
Add GraphQL layer over REST API	multi-language	69.2	56.3s	$0.02
Find and fix 4 hidden backdoors in Flask app	debugging	42.0	37.1s	<$0.01
Add cursor-based pagination to REST API	backend	80.2	40.6s	$0.02
Implement background job scheduler with persistence	backend	39.2	2m 13s	$0.01
Convert React app to PWA with offline support	frontend	67.7	48.8s	$0.01
Write Kubernetes manifests for Node.js microservice	full-stack	82.4	20.7s	<$0.01
Fix memory leak in event handler	debugging	72.0	34.4s	$0.02
Write complex SQL report with window functions	backend	70.2	46.7s	<$0.01
Add virtual scrolling to table rendering 5000 rows	frontend	34.0	48.9s	$0.02
Write integration tests for payment flow	code-review	80.5	1m 30s	$0.02
Implement multi-tenant row-level security in Postgres	backend	51.5	1m 15s	$0.01
Add file upload with S3 presigned URLs	backend	53.0	1m 30s	$0.02
Implement transformer inference engine with KV cache	from-scratch	76.2	22.7s	<$0.01
Add rate limiting middleware	backend	40.2	36.7s	<$0.01
Find and patch all OWASP Top 10 vulnerabilities	debugging	64.3	1m 18s	$0.01
Fix Node.js stream backpressure causing OOM on large files	backend	85.9	35.5s	$0.02
Fix hallucination and context window bugs in RAG agent	backend	30.3	54.2s	<$0.01
Code review: identify security vulns	code-review	75.0	54.9s	$0.02
Refactor monolithic handler to CQRS	refactoring	33.5	1m 14s	$0.02
Add slash commands and moderation to Discord bot	backend	70.8	34.1s	<$0.01
Replace console.log with structured logging	refactoring	38.5	1m 30s	$0.02
Build codebase indexer for LLM context windows	from-scratch	40.2	1m 16s	<$0.01
Build CLI tool with subcommands and config	from-scratch	35.8	33.8s	<$0.01
Fix race conditions in order matching engine	backend	81.5	28.2s	<$0.01
Split 1100-line god file into proper modules	refactoring	70.8	1m 2s	$0.01
Add Google OAuth2 login to Express app	full-stack	55.6	1m 27s	$0.02
Fix flaky test suite	debugging	69.5	14.5s	<$0.01
Fix broken GitHub Actions CI pipeline	debugging	67.2	35.3s	$0.02
Build distributed node cluster with gossip protocol	from-scratch	40.1	30.2s	<$0.01
Add streaming SSE endpoint for LLM chat	backend	67.0	53.9s	$0.02
Add i18n with locale routing to Next.js app	full-stack	66.8	2m 1s	$0.02
Build production website with auth and members area	frontend	52.0	3m 50s	$0.02
Build MCP server for database management	backend	53.5	48.7s	<$0.01
Remove AI slop and over-engineering from codebase	refactoring	72.9	36.2s	<$0.01
Build REST API from scratch	from-scratch	68.5	16.6s	<$0.01
Add retry logic and dead letter queue to Python task queue	backend	64.1	38.4s	<$0.01
Optimize bloated React bundle under 500KB	frontend	62.6	2m 22s	$0.02
Zero-downtime schema migration	full-stack	80.5	7.7s	<$0.01
Fix broken responsive layout	frontend	68.5	1m 7s	$0.02
Build LLM evaluation harness with structured grading	backend	50.0	1m 29s	$0.01
Optimize slow Postgres queries in Flask app	backend	53.0	48.8s	<$0.01
Build RAG pipeline with vector search	backend	46.2	53.7s	<$0.01
Debug race condition in worker pool	debugging	80.2	5.8s	<$0.01
Add WebSocket real-time updates	full-stack	56.6	37.6s	$0.02
Debug and fix 6 broken database triggers and constraints	debugging	58.7	1m 9s	<$0.01
Build real-time portfolio risk calculator	backend	29.9	1m 36s	$0.01
Dockerize Node.js monorepo	full-stack	65.8	30.1s	$0.01
Build terminal UI dashboard	from-scratch	52.3	40.7s	<$0.01
Add Redis caching layer to Express API	backend	74.3	1m 13s	$0.02
Add caching layer to eliminate slow SSR page loads	full-stack	81.7	1m 1s	$0.01
Harden insecure Docker setup with 12 vulnerabilities	code-review	70.6	15.0s	<$0.01
Fix data integrity bugs in denormalized e-commerce schema	debugging	77.7	42.4s	<$0.01
Implement Stripe webhook handler	backend	59.3	36.7s	$0.02
Write tests for untested legacy Flask service	code-review	32.1	1m 39s	$0.01
Fix auth bypass vulnerability	debugging	45.8	49.4s	$0.02
Fix deadlocking transaction patterns in Flask app	backend	63.0	32.5s	<$0.01