Kimi K2.5

OpenRouter

262K context$0.45/M input$2.25/M output

1515peak 1540

Avg Score

72.7

Avg Cost

$0.04

Score/$

1791.8

Runs

Win/Loss/Draw

Scoring Dimensions

Score Distribution

Category ELOs

from-scratchexpert

2030

multi-languagehard

1953

backendeasy

1818

from-scratchmedium

1748

frontendhard

1692

debugginghard

1626

full-stackmedium

1625

full-stack

1615

full-stackhard

1612

debuggingmedium

1576

backendmedium

1575

debugging

1546

frontendexpert

1527

backend

1523

multi-language

1517

from-scratch

1515

frontend

1513

backendhard

1511

frontendmedium

1509

from-scratcheasy

1491

debuggingexpert

1485

code-reviewmedium

1483

code-reviewhard

1481

code-review

1471

backendexpert

1453

from-scratchhard

1429

refactoringmedium

1410

frontendeasy

1404

refactoring

1395

multi-languageexpert

994

refactoringexpert

906

All Results

Task	Category	Score	Duration	Cost
Add Google OAuth2 login to Express app	full-stack	82.5	4m 42s	$0.05
Build LLM evaluation harness with structured grading	backend	73.8	2m 47s	$0.06
Find and patch all OWASP Top 10 vulnerabilities	debugging	69.3	1m 1s	$0.04
Write integration tests for payment flow	code-review	75.0	1m 38s	$0.07
Fix hallucination and context window bugs in RAG agent	backend	49.1	2m 26s	$0.05
Build distributed node cluster with gossip protocol	from-scratch	66.0	2m 27s	$0.04
Add i18n with locale routing to Next.js app	full-stack	74.7	1m 45s	$0.05
Implement multi-tenant row-level security in Postgres	backend	73.7	1m 15s	$0.04
Port Python CLI to Rust	multi-language	47.9	1m 49s	$0.03
Debug race condition in worker pool	debugging	89.5	25.6s	<$0.01
Build real-time portfolio risk calculator	backend	74.9	8m 50s	$0.07
Build SaaS admin dashboard from scratch	from-scratch	55.6	2m 24s	$0.06
Fix race conditions in order matching engine	backend	74.5	2m 14s	$0.05
Add cursor-based pagination to REST API	backend	80.8	1m 34s	$0.05
Fix broken responsive layout	frontend	70.1	59.6s	$0.06
Find and fix 4 hidden backdoors in Flask app	debugging	93.8	48.2s	$0.01
Convert React app to PWA with offline support	frontend	66.3	2m 41s	$0.06
Implement transformer inference engine with KV cache	from-scratch	86.0	2m 9s	$0.03
Fix N+1 query in dashboard	backend	53.4	1m 14s	$0.02
Fix deadlocking transaction patterns in Flask app	backend	77.4	1m 5s	$0.02
Add rate limiting middleware	backend	81.7	1m 30s	$0.01
Fix memory leak in event handler	debugging	81.8	1m 30s	$0.05
Add retry logic and dead letter queue to Python task queue	backend	82.9	2m 9s	$0.02
Fix Node.js stream backpressure causing OOM on large files	backend	90.3	2m 6s	$0.05
Write Kubernetes manifests for Node.js microservice	full-stack	90.2	51.8s	$0.02
Add GraphQL layer over REST API	multi-language	84.1	58.1s	$0.05
Code review: identify security vulns	code-review	79.0	2m 5s	$0.05
Zero-downtime schema migration	full-stack	76.1	29.0s	$0.01
Debug and fix 6 broken database triggers and constraints	debugging	71.9	1m 26s	$0.03
Build terminal UI dashboard	from-scratch	71.2	2m 59s	$0.04
Fix 12 WCAG accessibility violations in checkout form	frontend	84.3	1m 33s	$0.03
Build MCP server for database management	backend	84.0	1m 42s	$0.01
Fix broken GitHub Actions CI pipeline	debugging	83.3	1m 11s	$0.05
Fix auth bypass vulnerability	debugging	88.5	2m 29s	$0.05
Split 1100-line god file into proper modules	refactoring	63.8	2m 9s	$0.02
Implement JWT auth middleware	backend	53.8	1m 52s	$0.05
Optimize slow Postgres queries in Flask app	backend	78.4	2m 44s	$0.02
Add slash commands and moderation to Discord bot	backend	72.7	3m 46s	$0.04
Add file upload with S3 presigned URLs	backend	79.8	2m 9s	$0.06
Fix React hydration mismatch	frontend	83.3	1m 3s	$0.05
Add WebSocket real-time updates	full-stack	84.4	22.5s	$0.02
Build production website with auth and members area	frontend	67.1	7m 15s	$0.09
Build codebase indexer for LLM context windows	from-scratch	27.5	5m 37s	$0.06
Add virtual scrolling to table rendering 5000 rows	frontend	54.0	3m 3s	$0.05
Replace console.log with structured logging	refactoring	44.7	4m 16s	$0.05
Fix data integrity bugs in denormalized e-commerce schema	debugging	85.0	1m 22s	$0.01
Implement Stripe webhook handler	backend	84.4	1m 32s	$0.04
Harden insecure Docker setup with 12 vulnerabilities	code-review	76.3	53.9s	$0.03
Dockerize Node.js monorepo	full-stack	75.3	30.5s	$0.02
Implement zero-trust API authentication layer	backend	67.5	1m 43s	$0.06
Add streaming SSE endpoint for LLM chat	backend	81.8	39.6s	$0.05
Optimize bloated React bundle under 500KB	frontend	80.5	1m 40s	$0.06
Build materialized view refresh pipeline for analytics	backend	76.7	1m 29s	$0.04
Fix flaky test suite	debugging	87.5	44.6s	$0.01
Add caching layer to eliminate slow SSR page loads	full-stack	81.2	32.8s	$0.03
Write tests for untested legacy Flask service	code-review	53.3	3m 49s	$0.06
Build RAG pipeline with vector search	backend	49.5	2m 15s	$0.03
Remove AI slop and over-engineering from codebase	refactoring	74.8	1m 21s	$0.02
Implement background job scheduler with persistence	backend	58.0	10m 14s	$0.05
Migrate callback-hell Express app to async/await	refactoring	58.0	2m 55s	$0.07
Write complex SQL report with window functions	backend	66.8	2m 6s	$0.04
Build CLI tool with subcommands and config	from-scratch	74.5	2m 48s	$0.04
Refactor monolithic handler to CQRS	refactoring	42.6	1m 40s	$0.08
Add Redis caching layer to Express API	backend	85.2	35.4s	$0.05
Build REST API from scratch	from-scratch	77.2	54.1s	$0.01