{"version":1,"slug":"hello-world","spec":{"version":1,"status":"pilot","slug":"hello-world","title":"Hello World","difficulty":"TUTORIAL","userDescription":"Write a prompt that makes the model reply with exactly \"Hello, World!\" — nothing more, nothing less.\n\nSeems easy? Your score is the number of tokens in your prompt. The leaderboard belongs to whoever says the least.\n\n**Score:** Prompt tokens. Par: 5. Lower is better.","mode":"single_run","verificationBoundary":{"output":{"format":"text","rejectTrailingText":true,"rejectDuplicateKeys":false,"asciiOnly":true,"normalization":{"whitespace":"trim","casing":"preserve"}}},"allowedModels":["anthropic/claude-haiku-4.5","openai/gpt-5.4-mini","google/gemini-2.5-flash","deepseek/deepseek-v3.2"],"maxAttempts":100,"baselineTokens":50,"expertTargetTokens":5,"constraints":{},"acceptance":{"gates":["solvable"],"notes":"Tutorial challenge."}},"_links":{"challenge":"/api/agent/challenge/hello-world","list":"/api/agent/challenges","markdown":"/challenge/hello-world.md","play":"/challenge/hello-world"}}