{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2026-03-25-arc-agi-3-launch/","md":"https://postcutoff.com/e/2026-03-25-arc-agi-3-launch/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-03-25-arc-agi-3-launch","date":"2026-03-25","date_precision":"day","short_title":"ARC Prize launches ARC-AGI-3, an interactive game benchmark where frontier AI scored under 1%","deck":null,"takeaway":"The ARC Prize Foundation launched ARC-AGI-3 on 2026-03-25: novel turn-based game environments with no instructions, measuring skill-acquisition efficiency.","category":"benchmark","category_label":"Benchmarks","importance":4,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":[{"n":1,"title":"ARC-AGI-3","url":"https://arcprize.org/arc-agi/3","type":"official","group":"primary","domain":"arcprize.org"},{"n":2,"title":"ARC Prize 2026 — ARC-AGI-3 competition","url":"https://arcprize.org/competitions/2026/arc-agi-3","type":"official","group":"primary","domain":"arcprize.org"},{"n":3,"title":"ARC-AGI-3 paper (arXiv 2603.24621)","url":"https://arxiv.org/pdf/2603.24621","type":"paper","group":"primary","domain":"arxiv.org"},{"n":4,"title":"Kaggle leaderboard","url":"https://www.kaggle.com/competitions/arc-prize-2026-arc-agi-3/leaderboard","type":"discussion","group":"reactions","domain":"kaggle.com"}],"official":3,"filed":"2026-09-29","updated":"2026-09-29","orgs":["ARC Prize Foundation"],"title":"ARC Prize launches ARC-AGI-3, an interactive game benchmark where frontier AI scored under 1%","summary":"The ARC Prize Foundation launched ARC-AGI-3 on 2026-03-25: novel turn-based game environments with no instructions, measuring skill-acquisition efficiency. In the preview humans solved 100% of environments while frontier LLMs scored below ~0.4% (best purpose-built agent 12.58%); ARC Prize 2026 on Kaggle offers $850K including a $700K grand prize for 100%.","key_facts":["Launched 2026-03-25 at Y Combinator, San Francisco","Format: interactive environments; agents must learn rules by acting, with sparse feedback and no natural-language instructions","Developer preview: humans 100%; GPT-5.4, Claude Opus 4.6, Grok 4.2 scored 0%-0.37%; best preview agent 12.58% (secondary source)","ARC Prize 2026: $850K pool; $700K grand prize; milestone deadlines 2026-06-30 and 2026-09-30; solutions must be open-sourced","By July: GPT-5.6 7.78%, Claude Opus 5 30.16% (ARC Prize leaderboard)"],"key_numbers":[],"tags":["arc-agi","agents","reasoning","benchmark"],"science":null,"body_md":"## What happened\n\nARC-AGI-3 moved the ARC series from static grid puzzles to interactive games to test exploration, planning and learning from experience.\n\n## Why it matters\n\nIt was designed as the hardest-to-game AGI benchmark of 2026; within six months it was largely cracked (see GPT-6 Astra entry), illustrating the pace of agentic progress.","disputed":[],"related":[{"id":"2026-09-03-arc-agi-3-gpt-6-astra","url":"https://postcutoff.com/e/2026-09-03-arc-agi-3-gpt-6-astra/","date":"2026-09-03","date_precision":"day","short_title":"GPT-6 Astra scores 62.7% on ARC-AGI-3, outacting humans on 96% of levels","deck":null,"takeaway":"ARC-AGI-3 was meant to measure human-like skill acquisition; its near-saturation (and the harness gap) shows both how fast agentic reasoning improved in 2026 and how much scaffolding now drives scores.","category":"benchmark","category_label":"Benchmarks","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":7,"official":4,"filed":"2026-09-29","updated":"2026-10-04","orgs":["ARC Prize Foundation","OpenAI"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":null,"in_training_data":true},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":"https://postcutoff.com/s/arc-prize-arc-agi-3-interactive"}