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]
La première entrée est toujours la source de l’épingle. La confiance globale est une moyenne pondérée de la fermeté avec laquelle chaque référence étaye les heures de début et de fin retenues ci-dessus ; une référence compte moitié moins pour chaque tranche de 180 jours d’ancienneté par rapport à la plus récente.
platform.claude.com· Ajouté le 22 sept. 2026· 34 % du 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.com· Ajouté le 19 sept. 2026· Début 24 juil. 2026· 33 % du score
Anthropic's[1] Claude[2] Opus page lists this announcement and its date.
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CONFIRMÉCONFIANCE 90 %hierContrairement à l'annonce de Fable 5.1, cette page se date elle-même : l'en-tête indique « Claude[2] Opus 5.5 September 22, 2026 ». La signature de TechCrunch[3] (« 9:30 AM PDT · September 22, 2026 », « publié mardi ») et l'horodatage 2026-09-22T16:44Z de XDA concordent : la source maintient l'affirmation et les deux articles la corroborent.
Anthropic lance Claude Opus 5.5, premier modèle de la nouvelle famille Claude 5.5, qui égalerait Claude Fable 5.1 sur la plupart des tâches tout en coûtant 40 % moins cher à exécuter qu'Opus 5.
CONFIRMÉCONFIANCE 90 %il y a 160 joursAnthropic's[1][3] own announcement, dated the day the model became available.
Anthropic makes Claude Opus 4.7 generally available, a notable improvement on Opus 4.6 in advanced software engineering, especially on the hardest tasks.
CONFIRMÉCONFIANCE 90 %il y a 118 joursAnthropic's[1][3] own announcement, dated the day the model became available.
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
ESTIMÉCONFIANCE 65 %avant-hierNo 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.
CONFIRMÉCONFIANCE 90 %il y a 22 joursThe 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.
ESTIMÉCONFIANCE 65 %dans 7 joursSony[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.
ESTIMÉCONFIANCE 69 %il y a 22 joursRoland[1] announced the FP-40 on 1 September 2026 and its press release gives no availability date (https://www.roland.com/us/company/press_releases/2026/Roland-Unveils-FP-40-Digital-Piano-and-Piano-Spher/). Sonic State's same-day report says it is 'available now for USD 749' (https://sonicstate.com[3]/news/2026/09/01/fp-40-roland-s-first-wi-fi-piano/), but some retailers still listed it as pre-order into late September, so the day is estimated.
First Roland digital piano with built-in Wi-Fi and the Piano Sphere learning app.
CONFIRMÉCONFIANCE 82 %il y a 9,3 ansTourMag[3] reported Le Grand Carillon's official inauguration at Puy du Fou on June 16, 2017, after debuting with the park's April 2017 season.
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.
CONFIRMÉCONFIANCE 86 %il y a 64 joursNvidia[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.
