{"rewrite":{"id":"r_7f4712e2885cab36164b16d1","clusterId":"c_7e05c6cef149670bd3b6f6d7","slug":"anthropic-releases-claude-opus-5-5-with-40-percent-lower-cost","model":"deepseek-v4-1-flash","headline":"Anthropic Releases Claude Opus 5.5 With 40 Percent Lower Cost","summary":"Anthropic announced Claude Opus 5.5 on September 22, the first model in the Claude 5.5 family. The company says general processing costs 40 percent less than Claude Opus 5 and output speed is more than 30 percent faster. API pricing is $4 per million input tokens and $20 per million output tokens, down from $5 and $25. Cache reads fell 60 percent, from $0.50 to $0.20. Anthropic reports Opus 5.5 scored 66.4 percent on Terminal-Bench 4.0 against Opus 5's 52.3 percent and GPT-6 Astra's 57.9 percent. GPT-6 Astra led on Terminal-Bench-Science 0.1 (64.6 percent to 58.7 percent) and AutomationBench (41.4 percent to 40.0 percent). Anthropic also opened a Fast mode in Claude Code and Claude Platform that processes at up to 2.5 times the standard speed, and said Claude Sonnet 5.5 and Claude Haiku 5.5 will follow within weeks.","whyItMatters":"The price cut moves top-tier capability down toward the $4 input tier, but GPT-6 Astra still leads on scientific and automation benchmarks, so the cheaper model is not the leader across the board.","webCardHtml":"\u003cp\u003eClaude Opus 5.5 is already live on Anthropic\u0026#39;s own platforms and on Amazon Web Services, Google Cloud, and Microsoft Azure, under the model name \u0026#34;claude-opus-5-5.\u0026#34; Usage limits reset every five hours on the Pro, Max, Team, and Enterprise plans, and those limits are higher than before.\u003c/p\u003e\n\u003cp\u003eFor long code work, Anthropic says an early-user test audited and fixed 200,000 lines of code in under three hours, a task Opus 5 needed more than 20 hours to finish. Opus 5 also burned about 2.5 times as many tokens on the same job. In a load balancer rewrite from C to Rust, Opus 5.5 and Claude Fable 5.1 both passed nearly all of HAProxy\u0026#39;s regression tests, but Opus 5.5 finished in 9.5 hours against 12 hours and cost 51 percent less. Box reported roughly one third fewer tokens and responses about 40 percent shorter at the same accuracy.\u003c/p\u003e\n\u003cp\u003eSafety changes came with the release. Across about 2,000 automated scenarios, attempts to cross the model\u0026#39;s execution environment fell about 85 percent versus Opus 5 and Claude Mythos 5.1. Cybersecurity and biology tasks are routed to other models, with research access through a \u0026#34;Life Sciences Verification Program.\u0026#34; Opus 5.5 adds \u0026#34;preserved thinking\u0026#34; against distillation attacks and an EU AI Act watermark, and thinking mode can no longer be disabled.\u003c/p\u003e","blueskyPost":"Anthropic's own numbers show Claude Opus 5.5 beating GPT-6 Astra on Terminal-Bench 4.0 but losing on Terminal-Bench-Science and AutomationBench. The price cut is what makes that mixed scorecard matter.","twitterPost":"Anthropic cut Claude Opus 5.5's price while GPT-6 Astra still leads on two benchmarks. The cheaper tokens are the competitive move, not the wins.","threadsPost":"Claude Opus 5.5 beats GPT-6 Astra on Terminal-Bench 4.0 but loses on Terminal-Bench-Science and AutomationBench, per Anthropic's own numbers. The 40 percent cost cut lands against that split scorecard, not a clean sweep.","newsletterBlurb":"Anthropic's Claude Opus 5.5 lands with a 40 percent cost cut and a 30 percent speed gain over Opus 5, plus an API price of $4 per million input tokens. It beats Opus 5 on Terminal-Bench 4.0 but trails GPT-6 Astra on Terminal-Bench-Science 0.1 and AutomationBench. Sonnet 5.5 and Haiku 5.5 are promised within weeks.","attributionJson":"[{\"source\":\"ASCII.jp\",\"url\":\"https://ascii.jp/elem/000/004/436/4436645/?rss\",\"title\":\"Anthropic Announces \\\"Claude Opus 5.5,\\\" 40% Lower Cost, Beats OpenAI's \\\"GPT-6 Astra\\\" in Some Areas\"},{\"source\":\"GIGAZINE\",\"url\":\"https://gigazine.net/news/20260923-claude-opus-5-5/\",\"title\":\"Anthropic Announces AI Model \\\"Claude Opus 5.5,\\\" 40% Lower Cost and Over 30% Faster Than Opus 5, With Improved Coding Performance\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":19833,"outputTokens":1556,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1791036232,"createdAt":"2026-10-03T13:58:16.000Z","publishedAt":"2026-10-03T13:58:22.000Z","updatedAt":"2026-10-03T13:58:22.000Z"},"cluster":{"id":"c_7e05c6cef149670bd3b6f6d7","canonicalTitle":"AnthropicがAIモデル「Claude Opus 5.5」を発表、Opus 5よりコスト40％減・30％以上高速化しコーディング性能も向上","representativeArticleId":"a_efd05e9eb15219cf3519759e","sourceCount":2,"writtenSourceCount":2,"writeAttempts":0,"isSolo":false,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"Claude Opus 5.5\"],\"studios\":[\"Anthropic\",\"OpenAI\"],\"people\":[],\"type\":\"announcement\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-09-23T05:30:00.000Z","lastSeenAt":"2026-09-24T02:48:00.000Z","updatedAt":"2026-10-03T13:58:20.000Z"},"attribution":[{"source":"ASCII.jp","url":"https://ascii.jp/elem/000/004/436/4436685/?rss","title":"OrcaRouter、モデルリーダーボードを更新 - OpenAIの「GPT-5.4 Pro」が総合1位"},{"source":"GIGAZINE","url":"https://gigazine.net/news/20260924-anthropic-faster-claude/","title":"「Claudeを2週間で3倍速にした方法」をAnthropicが解説"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["Claude Opus 5.5"],"studios":["Anthropic","OpenAI"],"people":[],"type":"announcement","domain":"other","is_roundup":false},"keyFacts":["Anthropic announced Claude Opus 5.5 on September 22, 2026, as the first model in the Claude 5.5 family.","Claude Opus 5.5 costs 40 percent less than Claude Opus 5 for general processing and runs more than 30 percent faster in output speed, according to Anthropic.","Claude Opus 5.5 API pricing is $4 per million input tokens and $20 per million output tokens, down from $5 and $25 for Claude Opus 5.","Claude Opus 5.5 scored 66.4 percent on Terminal-Bench 4.0, above Claude Opus 5's 52.3 percent and GPT-6 Astra's 57.9 percent.","Anthropic plans to launch Claude Sonnet 5.5 and Claude Haiku 5.5 within the next few weeks."]}