{"rewrite":{"id":"r_c7ae971b49a6d21299fdbdd2","clusterId":"c_23c6cb4e3cc1fdd1ac0832c1","slug":"claude-opus-5-launches-with-fable-5-performance-at-half-the-price","model":"deepseek-v4-flash:free","headline":"Claude Opus 5 Launches With Fable 5 Performance at Half the Price","summary":"Anthropic released Claude Opus 5 on July 24, 2026, a new AI model that delivers performance comparable to the top-tier Claude Fable 5 while priced the same as the previous generation Claude Opus 4.8. API pricing is $5 per million input tokens and $25 per million output tokens, half the cost of Fable 5. In benchmarks, Opus 5 outperformed Fable 5 on Frontier-Bench v0.1 for coding agent performance and scored higher on the ARC-AGI-3 test for adapting to unknown environments, recording 30.2% compared to about 20% for Fable-series models. On CursorBench 3.2 under maximum reasoning settings, the gap with Fable 5 was within 0.5 points at half the per-task cost. Anthropic emphasized improvements in autonomous judgment and task completion for agent use, including the ability to argue against instructions when proposing better alternatives. Safety features include reduced intervention rates by about 85% compared to Fable 5, with fallback to Opus 4.8 for blocked cybersecurity and biology requests. A new Fast mode responds about 2.5 times faster at double the cost. Opus 5 is available through Claude's paid plans and API, and becomes the default model for the Max plan.","whyItMatters":"Claude Opus 5 collapses the price-performance gap between Anthropic's tiered model lineup, offering near-flagship capability at a cost that makes it viable for routine coding and knowledge work, while the safety relaxation compared to Fable 5 suggests Anthropic is calibrating restrictions per model tier rather than applying a uniform policy.","webCardHtml":"\u003cp\u003eAnthropic released Claude Opus 5 on July 24, 2026, positioning it as a cost-effective alternative to the flagship Claude Fable 5. The model is priced at $5 per million input tokens and $25 per million output tokens, identical to the previous Claude Opus 4.8 and half the cost of Fable 5. Third-party evaluator Artificial Analysis rated Opus 5 one point higher than Fable 5 in intelligence performance and ranked it first in both coding and agent performance.\u003c/p\u003e\u003cp\u003eAnthropic highlighted Opus 5\u0026#39;s improvements in autonomous judgment and task completion for agent use cases. The model can self-verify and iterate on its own work, reducing the pattern of reporting tasks as done when issues remain unresolved. It can also argue against instructions based on task purpose, with examples including pushing back on proposed designs and writing its own image processing pipeline to work around limitations. On OSWorld 2.0, which evaluates PC operations, Opus 5 surpassed Fable 5\u0026#39;s highest scores at all cost levels while achieving costs just over one-third.\u003c/p\u003e\u003cp\u003eSafety features include a misalignment behavior score of 2.3, the lowest in the Opus series. The frequency of intervention by cybersecurity classifiers is reduced by about 85% compared to Fable 5. Requests for binary scanning, penetration testing, and exploit generation are blocked and redirected to Opus 4.8. For biology-related requests that Fable 5 blocks, they are now redirected to Opus 5 instead of Opus 4.8. A new Fast mode operates at about 2.5 times normal speed at double the base price. Two beta features include mid-conversation tool changes without invalidating the prompt cache, and automatic redirection of safety-flagged requests to another model.\u003c/p\u003e","blueskyPost":"Claude Opus 5 is out: half the price of Fable 5, beats it on Frontier-Bench and ARC-AGI-3, and safety filters are 85% looser. Anthropic is betting on tiered restriction calibration.","twitterPost":"Anthropic's Opus 5 matches or tops Fable 5 in coding and reasoning benchmarks at half the cost. The safety fallback to Opus 4.8 for blocked requests is a new pattern.","threadsPost":null,"newsletterBlurb":"Anthropic launched Claude Opus 5, a model that matches or exceeds the flagship Fable 5 on several benchmarks while costing half as much. Safety restrictions are looser than Fable 5, with blocked requests redirected to Opus 4.8. The model is available now through Claude's paid plans and API.","attributionJson":"[{\"source\":\"ASCII.jp\",\"url\":\"https://ascii.jp/elem/000/004/422/4422202/?rss\",\"title\":\"Anthropic Announces 'Claude Opus 5' - Half the Price for Performance Comparable to Fable 5\"},{\"source\":\"GIGAZINE\",\"url\":\"https://gigazine.net/news/20260725-claude-opus-5/\",\"title\":\"Claude Opus 5 Launches, Offers Performance Equivalent to Claude Fable 5 at Half the Price with Looser Restrictions\"},{\"source\":\"GameBusiness.jp\",\"url\":\"https://www.gamebusiness.jp/article/2026/07/26/27550.html\",\"title\":\"Claude Opus 5 Launches, Half the Price with Performance Approaching Fable 5-Improved Judgment and Task Completion for Agent Use, Two Weeks After GPT-5.6 Sol Release\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":8848,"outputTokens":1342,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1785034665,"createdAt":"2026-07-26T02:49:41.000Z","publishedAt":"2026-07-26T02:50:45.000Z","updatedAt":"2026-07-26T02:49:41.000Z"},"cluster":{"id":"c_23c6cb4e3cc1fdd1ac0832c1","canonicalTitle":"「Claude Opus 5」が登場、Claude Fable 5の半額で同等性能を発揮し制限緩め","representativeArticleId":"a_72a0e030beabb73baa62266b","sourceCount":3,"writtenSourceCount":3,"writeAttempts":0,"isSolo":false,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[],\"studios\":[],\"people\":[],\"type\":\"news\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-07-24T20:32:00.000Z","lastSeenAt":"2026-07-25T21:15:03.000Z","updatedAt":"2026-07-26T02:50:45.000Z"},"attribution":[{"source":"ASCII.jp","url":"https://ascii.jp/elem/000/004/422/4422202/?rss","title":"Anthropic、「Claude Opus 5」発表　Fable 5級の性能を半額で"},{"source":"GameBusiness.jp","url":"https://www.gamebusiness.jp/article/2026/07/26/27550.html","title":"Claude Opus 5提供開始、Fable 5に迫る性能で半額―エージェント用途の判断力とタスク完遂力を向上、GPT-5.6 Sol投入から2週間"},{"source":"GIGAZINE","url":"https://gigazine.net/news/20260725-claude-opus-5/","title":"「Claude Opus 5」が登場、Claude Fable 5の半額で同等性能を発揮し制限緩め"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":[],"studios":[],"people":[],"type":"news","domain":"other","is_roundup":false},"keyFacts":["Claude Opus 5 launched on July 24, 2026, priced at $5 per million input tokens and $25 per million output tokens, half the cost of Claude Fable 5.","On Frontier-Bench v0.1, Opus 5 scored higher than Fable 5 at a lower per-task cost.","On ARC-AGI-3, Opus 5 scored 30.2% compared to about 20% for Fable-series models.","Safety intervention frequency is reduced by approximately 85% compared to Claude Fable 5.","Fast mode responds about 2.5 times faster than normal mode at double the cost."]}