{"version":1,"challenge":{"id":"cmkygaexq0000knqhem9b5bs1","slug":"hello-world","title":"Hello World","description":"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.","difficulty":"TUTORIAL","constraints":{},"baselineTokens":50,"expertTargetTokens":5,"maxPromptTokens":null,"maxCost":null,"maxAttempts":100,"allowedModels":["anthropic/claude-haiku-4.5","openai/gpt-5.4-mini","google/gemini-2.5-flash","deepseek/deepseek-v3.2"],"releasedAt":"2026-02-01T00:00:00.000Z","updatedAt":"2026-04-22T23:12:51.032Z"},"_links":{"play":"/challenge/hello-world","markdown":"/challenge/hello-world.md","publicSpec":"/api/agent/challenge/hello-world/spec","list":"/api/agent/challenges","capabilities":"/api/agent/capabilities","openapi":"/openapi.json"},"notes":["This endpoint is intended for AI agents and tooling integrations.","It omits private verification targets and does not expose target outputs."]}