{"rewrite":{"id":"r_e8572c575e056d89ad20c73d","clusterId":"c_2b1da06272cbe70deb64120e","slug":"capcom-details-monster-hunter-stories-3-npc-battle-ai-at-cedec-2026","model":"deepseek-v4-flash:free","headline":"Capcom Details Monster Hunter Stories 3 NPC Battle AI at CEDEC 2026","summary":"At CEDEC 2026, Capcom programmer Mitsuhiko Inaba presented the battle AI system for Monster Hunter Stories 3. The system uses a two-layer structure where machine learning selects an action category, and traditional methods pick a specific skill. This approach lets planners adjust character behavior intuitively without complex conditions, and a shared base model enables efficient production across characters.","whyItMatters":"The presentation shows a practical fusion of machine learning with conventional AI that keeps characters expressive while remaining adjustable by planners, a common pain point in RPG development.","webCardHtml":"\u003cp\u003eCapcom programmer Mitsuhiko Inaba, who handled AI for field and battle characters in Monster Hunter Stories 3, shared the design at CEDEC 2026. The game\u0026#39;s ally NPCs, such as the balanced Simon, the genius Tio, and the mixing-savvy Gaul, act fully autonomously in battle. The team wanted these characters to feel human and smart, avoiding both optimal-only actions and frustrating behavior.\u003c/p\u003e\u003cp\u003eInaba explained that character traits come from combining skills with \u0026#34;thought,\u0026#34; a system that maps situations to skill use via conditions and probabilities. Traditional setups grew hard to tune as conditions multiplied. The solution splits thinking into two layers: machine learning picks a broad action category, such as attack or recovery, while conventional methods choose the specific skill within that category. This keeps skill changes from affecting the model and lets the same model work across different weapons and progress states.\u003c/p\u003e","blueskyPost":"Capcom's CEDEC 2026 talk on Monster Hunter Stories 3 shows a hybrid battle AI: machine learning picks an action category, classic logic picks the skill. Planners tune via gameplay, and a shared base model cuts production cost.","twitterPost":"At CEDEC 2026, Capcom detailed Monster Hunter Stories 3's NPC battle AI: ML chooses action categories, traditional logic picks skills. Planners collect data by playing, and a base model enables mass production.","threadsPost":null,"newsletterBlurb":"Capcom programmer Mitsuhiko Inaba presented the battle AI for Monster Hunter Stories 3 at CEDEC 2026. The system splits decision-making into two layers, with machine learning choosing action categories and conventional methods selecting skills, allowing planners to tune character behavior intuitively. A shared base model helps keep production costs down.","attributionJson":"[{\"source\":\"GameBusiness.jp\",\"url\":\"https://www.gamebusiness.jp/article/2026/08/15/27715.html\",\"title\":\"NPCに個性ある行動を取らせるAIの作り方。『モンスターハンターストーリーズ3』のバトルAIの事例から考える【CEDEC2026】\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":6250,"outputTokens":625,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1786803707,"createdAt":"2026-08-15T14:15:51.000Z","publishedAt":"2026-08-15T14:16:44.000Z","updatedAt":"2026-08-15T14:15:51.000Z"},"cluster":{"id":"c_2b1da06272cbe70deb64120e","canonicalTitle":"NPCに個性ある行動を取らせるAIの作り方。『モンスターハンターストーリーズ3』のバトルAIの事例から考える【CEDEC2026】","representativeArticleId":"a_93b4d3bf5a22e54a22eeba03","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"Monster Hunter Stories 3\"],\"studios\":[],\"people\":[],\"type\":\"event\",\"domain\":\"games\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-08-15T05:00:03.000Z","lastSeenAt":"2026-08-15T05:00:03.000Z","updatedAt":"2026-08-15T14:16:44.000Z"},"attribution":[{"source":"GameBusiness.jp","url":"https://www.gamebusiness.jp/article/2026/08/15/27715.html","title":"NPCに個性ある行動を取らせるAIの作り方。『モンスターハンターストーリーズ3』のバトルAIの事例から考える【CEDEC2026】"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["Monster Hunter Stories 3"],"studios":[],"people":[],"type":"event","domain":"games","is_roundup":false},"keyFacts":null}