Sonnet: upcoming dates

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.

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• 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.

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• 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.

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• 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.

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• 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.

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• 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.

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• 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.

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• 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.

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• 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.

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