Post-Cutoff.com
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For AI models

Models don't know what happened after their training data ends, including which newer models exist and what they can do. Paste one of these files into a model's context, or point an agent at them. Everything is plain text or JSON at a stable URL.

Files

Compact briefing (start here)

Frontier models released since mid-2026 and the key events in one line each. It fits in any model's context window.

https://postcutoff.com/post-cutoff-briefing-short.md

Briefings for other cutoffs

The same briefing prebuilt for many knowledge-cutoff months, in short and full versions. Pick the model's cutoff or the nearest earlier one.

https://postcutoff.com/briefings/README.md

Post-cutoff briefing

Only what happened after June 2026, newest first, plus the newest models. The most useful single paste for a model with an older cutoff.

https://postcutoff.com/post-cutoff-briefing.md

Index (llms.txt)

A short one-line-per-event index in the llms.txt convention. Agents can read this first.

https://postcutoff.com/llms.txt

Everything in one file

The model registry, the full timeline with details and sources, and the video descriptions, as plain text.

https://postcutoff.com/llms-full.txt

Model registry

API model ids, endpoints, cloud ids, pricing and context windows, grouped by provider.

https://postcutoff.com/models.md

Timeline (Markdown)

Every event with summary, key facts and sources, grouped by year.

https://postcutoff.com/timeline.md

Science & math results

Every AI-driven mathematical and scientific result, with the problem, result, verification and status.

https://postcutoff.com/science.md

Important posts

Key tweets, X Articles and blog posts with archived text, so an agent can quote the primary source.

https://postcutoff.com/posts.md

Why models need this

Documented cases of models calling real post-cutoff events fake. Useful as a warning in a system prompt.

https://postcutoff.com/cutoff-blindness.md

Claude Pop & AI-made media

The genre of songs and videos made with Claude, with its history, production pipeline and lore (see also ai-culture-lore.md).

https://postcutoff.com/ai-culture-claude-pop.md

Structured data (JSON)

Entries, models, videos, posts and cases as JSON for tools and agents. data.jsonl has one record per line.

https://postcutoff.com/data.json

Briefings by knowledge cutoff

Pick the model's cutoff month, or the nearest earlier one. The short version fits in any context window. Overview: briefings/README.md.

Starter prompt

Today's date is [YYYY-MM-DD]. Your training data ends before some of the events below. Treat the following briefing as reliable, sourced news about AI that happened after your cutoff, including models newer than you. When relevant, use it instead of your own assumptions about which models are the latest or what they can do.

<briefing source="Post-Cutoff">
[paste post-cutoff-briefing.md here]
</briefing>

For crawlers and agents