{"version":1,"type":"story","url":"https://digestai.news/story/claude-fable-5-leads-fiveway-ai-trading-showdown-beating-mainline-ai-a","json":"https://digestai.news/story/claude-fable-5-leads-fiveway-ai-trading-showdown-beating-mainline-ai-a.json","markdown":"https://digestai.news/story/claude-fable-5-leads-fiveway-ai-trading-showdown-beating-mainline-ai-a.md","slug":"claude-fable-5-leads-fiveway-ai-trading-showdown-beating-mainline-ai-a","headline":"Claude Fable 5 leads five‑way AI trading showdown, beating Mainline AI and GPT-5.6 Sol","summary":"A daily experiment tracked five AI trading agents—Mainline AI (self‑improving v1.1), Claude Fable 5, Claude Fable 5.1, Codex’s GPT‑5.6 Sol, and GPT‑6 ASTRA—each managing a virtual ¥1 million portfolio. On the reported day the AI‑driven assets stayed in cash, so total values reflected only prior positions. Fable 5 posted ¥1,026,533, a 2.6 % gain, topping the leaderboard. Fable 5.1 held ¥1,000,000 (no change), while Mainline AI slipped to ¥998,745 (‑0.1 %).\n\nGPT‑5.6 Sol reported ¥1,065,472, up 6.5 % with gold (long) and silver (short) holdings, but generated no new trade signals. GPT‑6 ASTRA showed ¥981,026, down 1.9 %, holding short positions in gold and silver and a pending order for the next market open. The post also recapped back‑test results: over nine years Mainline AI returned 5.2 % annually, Fable 5 18.0 %, and Fable 5.1 12.4 %. Weekly performance was flat, with zero trades and a 0 % win rate.","keyPoints":["Claude Fable 5 ended the day with ¥1,026,533 (+2.6%), leading the five‑AI showdown.","GPT‑5.6 Sol held ¥1,065,472 (+6.5%) with gold long and silver short positions, but gave no new signals.","GPT‑6 ASTRA reported ¥981,026 (‑1.9%) and has one pending order for the next opening."],"whyItMatters":"The results compare self‑improving versus fixed‑method AI traders, offering insight into which approaches may deliver better returns for automated finance.","category":{"slug":"models","name":"Generative AI & Models","url":"https://digestai.news/category/models"},"entities":{"companies":[],"models":["Claude Fable 5","Claude Fable 5.1","Mainline AI","GPT-5.6 Sol","GPT-6 ASTRA"],"people":[]},"firstPublishedAt":"2026-10-18T19:02:00Z","updatedAt":"2026-10-18T19:02:00Z","sourceCount":1,"hasPrimarySource":false,"sources":[{"outlet":"note.com","title":"[Day 133] I had an AI manage my assets in earnest (2026-10-19) | Mainline AIs vs. Claude Fable 5 & 5.1 vs. GPT-5.6 Sol vs. GPT-6 ASTRA: A serious five-way showdown!","url":"https://note.com/vivid_quince2775/n/n3b80fafbc3d2?hl=en","publishedAt":"2026-10-18T19:02:00Z","type":"press","primary":false,"lead":true}],"sourceNotes":null,"discussions":[],"thread":null,"cite":{"text":"Digest AI, \"Claude Fable 5 leads five‑way AI trading showdown, beating Mainline AI and GPT-5.6 Sol\", 18 October 2026, https://digestai.news/story/claude-fable-5-leads-fiveway-ai-trading-showdown-beating-mainline-ai-a","publisher":"Digest AI","title":"Claude Fable 5 leads five‑way AI trading showdown, beating Mainline AI and GPT-5.6 Sol","datePublished":"2026-10-18T19:02:00Z","url":"https://digestai.news/story/claude-fable-5-leads-fiveway-ai-trading-showdown-beating-mainline-ai-a"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}