{"rewrite":{"id":"r_6037defdbfa15d45b04f73ed","clusterId":"c_b13c3e4c2017d87364b73a71","slug":"anthropic-launches-claude-fable-5-1-with-coding-gains-and-75-cache-price-cut","model":"deepseek-v4-flash","headline":"Anthropic Launches Claude Fable 5.1 with Coding Gains and 75% Cache Price Cut","summary":"Anthropic announced Claude Fable 5.1 and Claude Mythos 5.1 on September 1. Fable 5.1, now generally available, targets coding, knowledge work, and long-running agent tasks. Anthropic's tests show it more than doubled its predecessor's science benchmark score and topped its own Opus 5 and OpenAI's GPT-5.6 Sol on a coding benchmark. Cache read pricing fell 75% to $0.25 per million tokens. Mythos 5.1, a safety-relaxed research variant, stays limited to approved organizations.","whyItMatters":"The release pairs a broad performance jump in agentic and coding work with a 75% cut to cache pricing, the cost that scales with long-running agent workloads.","webCardHtml":"\u003cp\u003eAnthropic held headline rates flat at $10 per million input tokens and $50 per million output tokens, and put the discount into cache reads, which dropped from $1 to $0.25 per million tokens. The company estimates typical workloads run about 25% cheaper than Fable 5, and long-running agent tasks up to 45% cheaper.\u003c/p\u003e\u003cp\u003eThird-party testing is more mixed. Artificial Analysis scores high-load Fable 5.1 at 66 on its Intelligence Index against 61 for GPT-5.6 Sol, but at moderate settings the OpenAI model is cheaper and generates output faster.\u003c/p\u003e\u003cp\u003eMythos 5.1 shares Fable 5.1\u0026#39;s base model with relaxed safety restrictions for research, and access remains limited to vetted organizations in cybersecurity and life sciences.\u003c/p\u003e","blueskyPost":"Anthropic shipped Claude Fable 5.1 with a science benchmark score more than double its predecessor's and a coding score above GPT-5.6 Sol. Cache reads dropped 75% to $0.25 per million tokens. Mythos 5.1 stays locked to vetted research orgs.","twitterPost":"Anthropic launched Claude Fable 5.1: science benchmark score more than doubled vs Fable 5, coding score above GPT-5.6 Sol. Cache reads cut 75% to $0.25 per million tokens. Mythos 5.1 stays restricted to vetted orgs.","threadsPost":null,"newsletterBlurb":"Anthropic released Claude Fable 5.1 to general availability and Claude Mythos 5.1 to vetted research organizations. The new model more than doubled its predecessor's science benchmark score and topped GPT-5.6 Sol on coding, while cache read pricing dropped 75%.","attributionJson":"[{\"source\":\"ASCII.jp\",\"url\":\"https://ascii.jp/elem/000/004/431/4431620/?rss\",\"title\":\"Anthropic Announces Fable 5.1: Coding Performance Beats GPT-5.6 Sol, Cache Pricing Cut 75%\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":6130,"outputTokens":4357,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1788333825,"createdAt":"2026-09-02T07:18:42.000Z","publishedAt":"2026-09-02T07:22:22.000Z","updatedAt":"2026-09-02T07:22:22.000Z"},"cluster":{"id":"c_b13c3e4c2017d87364b73a71","canonicalTitle":"Anthropic「Fable 5.1」発表　コーディング性能でGPT-5.6 Sol超え　キャッシュ料金は75％値下げ","representativeArticleId":"a_e3a805443377786412cf6404","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[],\"studios\":[],\"people\":[],\"type\":\"announcement\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-09-02T04:40:00.000Z","lastSeenAt":"2026-09-02T04:40:00.000Z","updatedAt":"2026-09-02T07:22:24.000Z"},"attribution":[{"source":"ASCII.jp","url":"https://ascii.jp/elem/000/004/431/4431620/?rss","title":"Anthropic「Fable 5.1」発表　コーディング性能でGPT-5.6 Sol超え　キャッシュ料金は75％値下げ"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":[],"studios":[],"people":[],"type":"announcement","domain":"other","is_roundup":false},"keyFacts":null}