Anthropic: upcoming dates · Chronopin

Anthropic: upcoming dates · Chronopin

Recent

AI09/28/2026@TechDesk
Claude Sonnet 5.5 Released
San Francisco, California, United StatesAnthropic
Starts 09/28/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins86% CONFIDENCEOverall confidence: 86%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better5 days agoAnthropic's^[1] announcement is headed "Claude^[4] Sonnet 5.5 September 28, 2026" and says it "is now available on all platforms"; the model page lists "Released September 28, 2026", and TechCrunch^[2] (11:00 AM PDT, September 28, 2026) and CNBC^[3] ("Anthropic on Monday released") agree.
Anthropic releases Claude Sonnet 5.5, the second model in its Claude 5.5 family, which it says runs more than 30% faster than Sonnet 5 and costs up to 30% less per task at the same $2 and $10 per million token prices.
AI09/22/2026@TechDesk
Claude Opus 5.5 Released
San Francisco, California, United StatesAnthropic
Starts 09/22/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better11 days 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.
Software09/19/2026@OddsDesk
Anthropic Expected to Release Its Next Claude Opus Model
Anthropic, 500 Howard Street, San Francisco, CAAnthropic
Starts 09/21/2026ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins65% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence12 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.
AI09/22/2026@TechDesk
Anthropic Confirms It Runs a Wet Biology Lab in the Bay Area
San Francisco, California, United StatesAnthropic
Starts 09/18/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins93% CONFIDENCEOverall confidence: 93%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better15 days agoThe source^[1] page carries its own date of 22 September 2026 and is a write-up of earlier reporting, so the event's date comes from the two reports it is built on: Reuters^[2] published the exclusive at 3:02 AM PDT on 18 September 2026 and TechCrunch^[3] the confirmation at 4:13 PM PDT the same day - "Anthropic^[4][5][6] has a wet biology lab in the Bay Area where it can use its AI models to run physical experiments, it has confirmed to TechCrunch". The pin is the day the lab was disclosed: Anthropic gave no date for when it opened and declined to say where it is beyond the Bay Area, so the pin sits on San Francisco, the city of its own headquarters.
Anthropic confirmed it operates a wet biology lab in the Bay Area where its models can run physical experiments, its head of life sciences Eric Kauderer-Abrams saying the company is doing real lab work today. Anthropic says the facility's focus is fundamental biology rather than drug discovery, where it partners with pharma customers including Novo Nordisk.
AI09/22/2026@TechDesk
Claude Fable 5.1 and Mythos 5.1 Released
San Francisco, California, United StatesAnthropic
Starts 09/01/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better32 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.
AI09/19/2026@TechDesk
Claude Opus 5 Released
Anthropic
Starts 07/24/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better71 days agoAnthropic's^[1][3] own announcement, dated the day the model became available.
Anthropic releases Claude Opus 5, a step-change improvement for the Opus tier for long-running agents, with gains in coding and professional work.
AI09/28/2026@TechDesk
Claude Sonnet 5 Released
San Francisco, California, United StatesAnthropic
Starts 06/30/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better95 days agoThe post is dated "Jun 30, 2026" and says "From today, Claude^[2] Sonnet 5 is available across all plans"; the docs model page lists "Released June 30, 2026" and TechCrunch's^[3] 2026-06-30 report says it is the default "Starting Tuesday".
Anthropic releases Claude Sonnet 5, its most agentic Sonnet, which comes close to Opus 4.8 on coding and computer use at $2 per million input tokens and becomes the default model for Free and Pro users.
AI09/19/2026@TechDesk
Claude Opus 4.8 Released
Anthropic
Starts 05/28/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better128 days agoAnthropic'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.
AI09/19/2026@TechDesk
Claude Opus 4.7 Released
Anthropic
Starts 04/16/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better170 days agoAnthropic'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.
AI09/28/2026@TechDesk
Claude Sonnet 4.6 Released
San Francisco, California, United StatesAnthropic
Starts 02/17/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better228 days agoThe post is dated "Feb 17, 2026" and says "Claude^[2] Sonnet 4.6 is available now on all Claude plans, Claude Cowork, Claude Code, our API, and all major cloud platforms"; the docs model page lists "Released February 17, 2026" and CNBC^[3] reported it that day.
Anthropic releases Claude Sonnet 4.6, its most capable Sonnet, which coding testers preferred to Opus 4.5 and which becomes the free default in claude.ai with a 1M-token context window at $3 per million input tokens.
AI09/19/2026@TechDesk
Claude Opus 4.6 Released
Anthropic
Starts 02/05/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better240 days agoAnthropic's^[1][2] own announcement, dated the day the model became available.
Anthropic upgrades its smartest model with Claude Opus 4.6, industry-leading across agentic coding, computer use, tool use, search and finance.
Property09/24/2026@TechDesk
Anthropic Leases the Whole 27-Story Tower at 300 Howard Street
300 Howard Street, Rincon Hill, San Francisco, California, United StatesAnthropic
Starts 01/30/2026CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better246 days agoStated, though attributed, per SFist^[1] on Friday 30 January 2026: "The deal reportedly closed Friday, and Anthropic has taken a 13-year lease on the 27-story building."
Anthropic took a 13-year lease on all 420,000 square feet of 300 Howard Street, formerly 199 Fremont, one of San Francisco's largest office deals since 2019, as it grew past 1,300 staff in the Bay Area.
AI09/19/2026@TechDesk
Claude Opus 4.5 Released
Anthropic
Starts 11/24/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better313 days agoAnthropic's^[1][3] own announcement, dated the day the model became available.
Anthropic releases Claude Opus 4.5, its new flagship model with state-of-the-art coding and agentic performance at lower pricing.
AI09/28/2026@TechDesk
Claude Haiku 4.5 Released
San Francisco, California, United StatesAnthropic
Starts 10/15/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins89% CONFIDENCEOverall confidence: 89%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better353 days agoAnthropic's^[1][3][4] post is dated "Oct 15, 2025": "Claude^[2] Haiku 4.5, our latest small model, is available today to all users"; the Claude release notes ("October 15, 2025 We've launched Claude Haiku 4.5"), CNBC^[5] and TechCrunch^[6] agree.
Anthropic releases Claude Haiku 4.5, a small model that matches Claude Sonnet 4 on coding at one-third the cost and more than twice the speed, free to all Claude users and $1 per million input tokens on the API.
AI09/28/2026@TechDesk
Claude Sonnet 4.5 Released
San Francisco, California, United StatesAnthropic
Starts 09/29/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins89% CONFIDENCEOverall confidence: 89%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.0 years agoThe post is dated "Sep 29, 2025" and says "Claude^[2] Sonnet 4.5 is available everywhere today"; the docs model page lists "Released September 29, 2025" and TechCrunch^[4] reports the launch "On Monday".
Anthropic releases Claude Sonnet 4.5, which it calls the best coding model in the world at 77.2% on SWE-bench Verified, leads OSWorld computer use at 61.4% and keeps working on one task for more than 30 hours.
AI09/28/2026@TechDesk
Claude Opus 4.1 Released
San Francisco, California, United StatesAnthropic
Starts 08/05/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins89% CONFIDENCEOverall confidence: 89%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.2 years agoAnthropic's^[1][3] post is dated "Aug 5, 2025": "Today we're releasing Claude^[2][4] Opus 4.1 ... now available to paid Claude users and in Claude Code. It's also on our API, Amazon Bedrock, and Google Cloud's Vertex AI"; the Claude release notes and GitHub's^[5] changelog carry the same date.
Anthropic releases Claude Opus 4.1, an upgrade to Claude Opus 4 that raises its SWE-bench Verified coding score to 74.5% at the same price, on the day OpenAI released its first open-weight models since 2019.
AI09/28/2026@TechDesk
Claude Sonnet 4 Released
San Francisco, California, United StatesAnthropic
Starts 05/22/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins84% CONFIDENCEOverall confidence: 84%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.4 years agoThe system card is dated only "May 2025", so the day is the launch post's: "Introducing Claude 4, May 22, 2025" - "Today, we're introducing the next generation of Claude models: Claude Opus 4 and Claude Sonnet 4"; TechCrunch^[4] reports the launch at Anthropic's^[1][3] developer conference "Thursday" 22 May.
Anthropic releases Claude Sonnet 4 beside Claude Opus 4, a free-tier upgrade to Claude 3.7 Sonnet that scores 72.7% on SWE-bench Verified at $3 per million input tokens and powers GitHub Copilot's new coding agent.
AI09/28/2026@TechDesk
Claude Opus 4 Released
San Francisco, California, United StatesAnthropic
Starts 05/22/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.4 years agoAnthropic's^[1][2][6] post is dated "May 22, 2025": "Today, we're introducing the next generation of Claude^[3] models: Claude Opus 4 and Claude Sonnet 4", "available on our API, Amazon Bedrock, and Google Cloud's Vertex AI"; CNBC^[4] and TechCrunch^[5] report the launch that Thursday.
Anthropic releases Claude Opus 4, which it calls the world's best coding model at 72.5% on SWE-bench and able to work for hours on end, the first Claude model deployed under its stricter ASL-3 safety protections.
AI09/28/2026@TechDesk
Claude 3.7 Sonnet Released
San Francisco, California, United StatesAnthropic
Starts 02/24/2025CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins85% CONFIDENCEOverall confidence: 85%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.6 years agoThe post is dated "Feb 24, 2025": "Today, we're announcing Claude 3.7 Sonnet" and it "is now available on all Claude plans"; TechCrunch^[4] says it "is rolling out to all users and developers on Monday" (24 February).
Anthropic releases Claude 3.7 Sonnet, the first hybrid reasoning model, which answers instantly or thinks step by step for as long as the user allows, and launches the Claude Code terminal agent beside it.
AI09/28/2026@TechDesk
Claude 3.5 Haiku Released
San Francisco, California, United StatesAnthropic
Starts 11/04/2024CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.9 years agoClaude's^[2][3] release notes: "November 4th, 2024 Claude Haiku 3.5 is now available on the Claude API as a text-only model"; TechCrunch^[4] (10:24 AM PST, 4 November 2024) reports "Anthropic's^[1][6] newest AI model has arrived" and AWS posted Bedrock availability the same day. The 22 October post had said it "will be released later this month".
Anthropic releases Claude 3.5 Haiku on its API, Amazon Bedrock and Vertex AI, a text-only small model that it says beats Claude 3 Opus on many benchmarks, at $1 per million input tokens, four times Claude 3 Haiku's price.
AI09/28/2026@TechDesk
Claude 3.5 Sonnet Upgrade Released
San Francisco, California, United StatesAnthropic
Starts 10/22/2024CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better1.9 years agoThe post is dated "Oct 22, 2024" and says "The upgraded Claude 3.5 Sonnet is now available for all users. Starting today, developers can build with the computer use beta"; TechCrunch^[4] and CNBC^[5] report the release "on Tuesday" the same day.
Anthropic releases an upgraded Claude 3.5 Sonnet that lifts SWE-bench Verified from 33.4% to 49.0% and is the first frontier model to offer computer use, moving a cursor and typing like a person, in public beta.
AI09/28/2026@TechDesk
Claude 3.5 Sonnet Released
San Francisco, California, United StatesAnthropic
Starts 06/20/2024CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins85% CONFIDENCEOverall confidence: 85%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better2.3 years agoAnthropic^[1][2]: "Today, we're launching Claude 3.5 Sonnet" and it "is now available for free on Claude.ai"; the page header now shows Jun 21, 2024, but TechCrunch^[4] and AWS both published the launch on 20 June 2024 and the model ID is claude-3-5-sonnet-20240620.
Anthropic releases Claude 3.5 Sonnet, which beats its own Claude 3 Opus at the mid-tier model's $3 per million input tokens and twice Opus's speed, alongside the new Artifacts workspace in Claude.ai.
AI09/28/2026@TechDesk
Claude 3 Haiku Released
San Francisco, California, United StatesAnthropic
Starts 03/13/2024CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better2.6 years agoAnthropic's^[1][5] post is dated "Mar 13, 2024": "Today we're releasing Claude^[2] 3 Haiku ... The model is now available alongside Sonnet and Opus in the Claude API and on claude.ai for our Claude Pro subscribers"; AWS announced it on Amazon^[4] Bedrock the same day.
Anthropic releases Claude 3 Haiku, the fastest and cheapest Claude 3 model at $0.25 per million input tokens, able to read about 30 pages of text per second, nine days after announcing it with Opus and Sonnet.
AI09/28/2026@TechDesk
Claude 3 Sonnet Released
San Francisco, California, United StatesAnthropic
Starts 03/04/2024CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins83% CONFIDENCEOverall confidence: 83%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better2.6 years agoThe model card carries no launch date, so the date is the launch post's: "Introducing the next generation of Claude, Mar 4, 2024" - "Opus and Sonnet are now available to use in claude.ai and the Claude API"; AWS's post of 04 MAR 2024 announces "the availability of Anthropic's^[1][3] Claude 3 Sonnet today in Amazon^[4] Bedrock".
Anthropic releases Claude 3 Sonnet, the middle model of its new Claude 3 family, twice as fast as Claude 2.1 on most workloads at $3 per million input tokens and the model behind the free claude.ai.