{"slug": "claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost", "title": "Claude Opus 5 leads on agentic work — and undercuts Fable 5 on cost", "summary": "Claude Opus 5, Anthropic's new model, leads on agentic knowledge work and undercuts Fable 5 on cost, according to Artificial Analysis. The model scores 61 on the Artificial Analysis Intelligence Index, effectively tied with Fable 5's 60, but offers better agentic outcomes at a lower price. However, its hallucination rate climbed to 50%, making Fable 5 preferable for factual precision tasks.", "body_md": "Claude Opus 5 is out, and Artificial Analysis — who supported Anthropic's pre-release evaluation — just dropped their full benchmark breakdown. The headline: new top model for agentic knowledge work, and cheaper per task than Fable 5.\n\nThat combination doesn't come along often at the frontier.\n\n\"Opus 5 (max) scores 61 on the Artificial Analysis Intelligence Index, effectively tied with Claude Fable 5 (max, 60), and ahead of GPT-5.6 Sol (max, 59)\"\n\nFor agentic workloads — the things most teams are actually building on right now — Opus 5 doesn't just match Fable 5. It beats it, and charges less to do it.\n\nFable 5 was the \"throw more at it\" option. Opus 5 reframes the trade-off: better agentic outcomes *and* a lower bill. At mid-tier effort settings (high, xhigh), it can outperform both Opus 4.8 and Sonnet 5 on a cost-per-task basis. That's a lot of headroom to play with before you're even at max effort.\n\nThe caveat worth flagging: factual knowledge still lags. Opus 5 improved +7 points on AA-Omniscience over Opus 4.8, but its hallucination rate climbed 14 points to 50% — it guesses more confidently when uncertain. For retrieval-heavy or factual precision tasks, Fable 5 still holds the edge.\n\n`high`\n\nor `xhigh`\n\neffort before committing to `max`\n\n.Full benchmark breakdown: [Artificial Analysis — Claude Opus 5](https://artificialanalysis.ai/articles/opus-5)\n\n*✏️ Drafted with KewBot (AI), edited and approved by Drew.*", "url": "https://wpnews.pro/news/claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost", "canonical_source": "https://dev.to/thegatewayguy/claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost-4b02", "published_at": "2026-07-25 21:42:47+00:00", "updated_at": "2026-07-25 22:00:44.507717+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-products", "ai-research"], "entities": ["Anthropic", "Claude Opus 5", "Claude Fable 5", "Artificial Analysis", "GPT-5.6 Sol", "Opus 4.8", "Sonnet 5", "KewBot"], "alternates": {"html": "https://wpnews.pro/news/claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost", "markdown": "https://wpnews.pro/news/claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost.md", "text": "https://wpnews.pro/news/claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost.txt", "jsonld": "https://wpnews.pro/news/claude-opus-5-leads-on-agentic-work-and-undercuts-fable-5-on-cost.jsonld"}}