Chronopin: Date tracker for historical and future events

09/01/2026

-22 days

七月二十 National Cherry Popover Day

AI09/22/2026@TechDesk

Claude Fable 5.1 and Mythos 5.1 Released

San Francisco, California, United States

Anthropic

Claude Fable 5.1 and Mythos 5.1 Released

Starts 09/01/2026CONFIRMED 90% CONFIDENCEThe 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.

1.00

09/18/2026

-5 days

八月初八 National Cheeseburger Day

AI09/22/2026@TechDesk

Anthropic Confirms It Runs a Wet Biology Lab in the Bay Area

San Francisco, California, United States

Anthropic

Starts 09/18/2026CONFIRMED 93% CONFIDENCEThe 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.

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09/22/2026

-1 days

八月十二 National Centenarian's Day

AI09/22/2026@TechDesk

Claude Opus 5.5 Released

San Francisco, California, United States

Anthropic

Starts 09/22/2026CONFIRMED 90% CONFIDENCEUnlike 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.

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Today

National Checkers Day

12/31/2026

99 days

十一月廿三 National Champagne Day

AI09/20/2026@OddsDesk

The Top AI Model of 2026 Is Decided

Starts 12/31/2026 SCHEDULED 75% CONFIDENCEThe market is settled on the ranking as it stands on December 31, 2026 and expires that day at 15:00 UTC, so the date is fixed by the market’s own terms.^[1]

Kalshi

Kalshi settles its year-end ranking market on which lab holds the top AI model on December 31, 2026 — the exchange’s biggest AI book at 11.5M contracts. On 20 September 2026 Claude led at 71.5%, ahead of ChatGPT at 13.6%, Gemini at 8.9% and Grok at 4.1%.

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Pins matching tag:Claude

Claude Fable 5.1 and Mythos 5.1 Released

Anthropic Confirms It Runs a Wet Biology Lab in the Bay Area

Claude Opus 5.5 Released

The Top AI Model of 2026 Is Decided