Anthropic releases Claude Opus 5, a step-change improvement for the Opus tier for long-running agents, with gains in coding and professional work.
Anthropic released Claude Opus 5 on July 24, 2026, available on all platforms as claude-opus-5 at $5/$25 per million tokens, the same as Opus 4.8[1][3]
Positioned as close to the frontier intelligence of Claude Fable 5 at half the price; new default model on Claude Max, strongest on Claude Pro; still behind Mythos 5 on cybersecurity tasks[1]
Cyber classifiers block binary-based vulnerability scanning, penetration testing and exploit generation; flagged requests fall back to Opus 4.8 by default; Cyber Verification Program members get a less restricted version[1]
Beta updates: mid-conversation tool changes without invalidating the prompt cache, and automatic fallbacks on the API[1]
The Opus product page announces it as new, "a step-change improvement for the Opus tier", available to Pro, Max, Team and Enterprise[3]
Notable features
Opus 5 is described as a step-change improvement over Opus 4.8, with the largest gains in deep reasoning, agentic and long-horizon tasks, and test-time compute scaling; thinking is on by default and can be disabled only at effort high or below[2]
Specifications: 1M-token context window, 128K max output tokens (300K on the Batch API in beta), adaptive thinking with high default effort, text and image input with text output, and a May 2026 reliable knowledge cutoff; Fast mode runs around 2.5 times the default speed at twice the base price[1][2]
State of the art on Frontier-Bench and GDPval-AA; ARC-AGI 3 score three times the next-best model; Zapier AutomationBench pass rate about 1.5x next-best[1]
Life sciences: better than Opus 4.8 on every eval, with organic chemistry up 10.2 points and protein tasks up 7.7[1]
Alignment: called Anthropic's most aligned model to date, with a misaligned behavior score of 2.3[1]
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
platform.claude.com· Added Sep 22, 2026· 34% of score
Anthropic's[1][3] Claude Opus 5 model page calls it "a step-change improvement over Claude Opus 4.8" and lists a 1M-token context window, 128K max output, adaptive thinking on by default and a May 2026 knowledge cutoff.
Anthropic's[1] Claude[2] Opus page lists this announcement and its date.
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CONFIRMED90% CONFIDENCE1 day agoUnlike the Fable 5.1 announcement, this page dates itself: the header reads “Claude[2] Opus 5.5 September 22, 2026”. TechCrunch's[3] byline (“9:30 AM PDT · September 22, 2026”, “released on Tuesday”) and XDA's 2026-09-22T16:44Z timestamp agree, so the source[1] keeps the claim and the two reports corroborate it.
Anthropic releases Claude Opus 5.5, the first model in a new Claude 5.5 family, which it says matches Claude Fable 5.1 on most work while costing 40% less to run than Opus 5.
Anthropic makes Claude Opus 4.7 generally available, a notable improvement on Opus 4.6 in advanced software engineering, especially on the hardest tasks.
Anthropic releases Claude Opus 4.8, stronger across coding, agentic tasks and professional work, with the consistency to keep working on long-running tasks.
Anthropic, 500 Howard Street, San Francisco, CAAnthropic
ESTIMATED65% CONFIDENCE2 days agoNo official date: September 21 is the day Polymarket's[1][2] per-day market prices highest, at 31% on its outcome row (the page header reads 30.5%), with September 22 at 25% and September 24 at 15%, and “No release by September 30” at 22%. The figures are the chance on each row, not the Buy Yes or Buy No prices in cents beside them.
Polymarket
Polymarket
Prediction-market traders expected Anthropic to ship the successor to Claude Opus 5 (released July 24, 2026) within days. On 19 September 2026 Polymarket's per-day market made September 21 the single likeliest day at 31%, ahead of September 22 at 25%, and its deadline market gave a release by September 30 an 83% chance and by October 31 98%. Anthropic had not announced the model; the “Opus 5.1” name comes from leaked early-access identifiers and early tester reports.
CONFIRMED90% CONFIDENCE22 days agoThe announcement page does not date itself - it says only “September 2026” and “available today”, and the one ISO timestamp in its HTML is a page build time. The date comes from Anthropic's[1][3] own news index, whose card for this article carries <time>Sep 1, 2026</time>, and is confirmed independently by MacRumors[5]' article:published_time of 2026-09-01T19:15:16Z (“Anthropic today introduced Claude[2] Fable 5.1”) and by Wikipedia's[4] Claude Mythos infobox, “Claude Mythos 5.1 / September 1, 2026”.
Anthropic releases Claude Fable 5.1 and Claude Mythos 5.1 - the same model behind different safeguards - and cuts cache reads by 75%, making typical workloads about 25% cheaper to run than Fable 5.
ESTIMATED65% CONFIDENCEin 7 daysSony[1] announced the Bravia 6 on 28 August 2026 (https://www.hdtvtest[3].co.uk/news/sony-announces-its-first-oled-tv-in-2026-with-the-bravia-6) but published no on-sale date; coverage states only that the line launches in September 2026. Month-only, so the last day of September 2026 is used.
Entry-level 4K OLED TV with Sony's Triluminos Pro engine, available in five sizes.
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Puy du Fou in Les Epesses, France added Le Grand Carillon, a purpose-built carillon tower performed live as a musical show. The bells, cast by the Dutch foundry Royal Eijsbouts, were engineered specifically for the park's new attraction.
CONFIRMED86% CONFIDENCE64 days agoNvidia[2] confirmed on July 21, 2026 that 'systems are now shipping to customers'.
Nvidia said its Vera Rubin NVL72 rack systems are now shipping to cloud providers and system makers, with 288 GB of HBM4 per GPU and about five times Blackwell's inference performance.
