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LLM knowledge cutoff dates

When each model's training data ends, for 22 live models from 4 labs, latest first. Every date is the one the lab publishes, read on its own page and linked in the last column; a model whose lab publishes none is left out. Next to it: the day ArtificialWatch verified the model live, and how many months after its cutoff that was. Checked November 6, 2026.

ModelKnowledge cutoffReleasedMonths laterSource
GPT-6.1 TerraOpenAIJune 1, 2026Oct 26, 20264Model page
Claude Haiku 5.5AnthropicJune 2026Oct 7, 20264Models overview
Claude Sonnet 5.5AnthropicJune 2026Sep 28, 20263Models overview
Claude Opus 5.5AnthropicJune 2026Sep 22, 20263Models overview
Fable 5.1AnthropicJune 2026Sep 1, 20263Models overview
GPT-6 LunaOpenAIMay 18, 2026Sep 22, 20264Model page
Grok 4.7xAIMay 2026Sep 21, 20264xAI docs
Claude Opus 5AnthropicMay 2026Jul 24, 20262Transparency hub
GPT-6.1 SolOpenAIApril 30, 2026Sep 29, 20265Model page
GPT-6 AstraOpenAIApril 30, 2026Sep 3, 20265Model page
GPT-6 SolOpenAIApril 20, 2026Sep 22, 20265Model page
Gemini 4GoogleMarch 2026Oct 13, 20267Model card
Gemini 3.8 FlashGoogleMarch 2026Sep 2, 20266Model card
Gemini 3.7 FlashGoogleMarch 2026Aug 13, 20265Model card
Gemini 3.5 Flash-LiteGoogleMarch 2026Jul 21, 20264Model card
Gemini 3.6 FlashGoogleMarch 2026Jul 21, 20264Model card
ChatGPT-5.6OpenAIFebruary 16, 2026Jul 9, 20265Model page
Fable 5AnthropicJanuary 2026Jul 1, 20266Transparency hub
Claude Sonnet 5AnthropicJanuary 2026Jun 30, 20265Transparency hub
Mythos 5AnthropicJanuary 2026Jun 9, 20265Transparency hub
Claude Opus 4.8AnthropicJanuary 2026May 27, 20264Transparency hub
GPT-5.5OpenAIDecember 1, 2025Apr 24, 20264Model page

OpenAI gives the day; Anthropic, Google and xAI give the month. “Months later” counts calendar months from the cutoff to the release, so a June cutoff and a September release is 3. The median across these 22 is 4. Anthropic publishes two dates for its current models, a reliable knowledge cutoff and a training data cutoff; both are June 2026.

No cutoff published: DeepSeek (its API docs and the DeepSeek V4.1 Flash card on Hugging Face); Moonshot (its Kimi K3.1 Pro API docs and Hugging Face card); Zhipu AI (its GLM-5.3 docs and Hugging Face card); Mistral (its Mistral Large 4 docs); MiniMax (its model docs). Catalogs fill those gaps with dates the labs don't state, and sometimes contradict the ones they do, so this page uses neither.

Quick answers

Which AI model has the latest knowledge cutoff?

June 2026 is the latest published cutoff on this list, for GPT-6.1 Terra (June 1, 2026), Claude Haiku 5.5, Claude Sonnet 5.5, Claude Opus 5.5 and Fable 5.1. Labs that give only a month can't be ordered within it.

What is a knowledge cutoff?

The date a model's training data ends. The model knows nothing that happened after it unless the app gives it search or the facts are in the prompt, and labs warn that coverage of the last months before the cutoff can be thin.

How long after its knowledge cutoff does an AI model come out?

A median of 4 months for the 22 live models here, counted in calendar months from the cutoff to the day the model went live. The shortest gap is 2 months (Claude Opus 5), the longest 7 months (Gemini 4).

Why isn't every model on this list?

Only a date the lab itself publishes is listed. We found none on the pages we read for DeepSeek, Moonshot, Zhipu AI, Mistral and MiniMax, so their models are left out rather than given a catalog's guess.

Release dates for every model: the release log. Context windows: LLM context windows. Prices: LLM API pricing. For an alert when a new model goes live, watch free.

The table as JSON or CSV, free to reuse under CC BY 4.0 with a link to this page. More files on open data.

Reports from this data

Every report, from every dataset: data reports.

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