As of: 2026-10-10 14:45 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/you/upstage-solar-mini-4/

# Solar Mini 4 has no published cutoff

Solar Mini 4 (Upstage): no published training cutoff; released 1 October 2026. Counts start at its release, so they are a floor.

- At least 221 AI events since its release (35 major, 10 historic), as of 2026-10-10.
- 9 AI models in the model registry released after it; 9 days of news.

## Five things it has never heard of

1. 2026-10-09, confirmed: Anthropic discloses unintended model actions. https://postcutoff.com/e/2026-10-09-anthropic-unintended-model-actions-false-police-tip/ Source: https://www.anthropic.com/research/investigating-unintended-model-actions
2. 2026-10-06, confirmed: Mistral releases Mistral Large 4 ("le Chonk"). https://postcutoff.com/e/2026-10-06-mistral-large-4/ Source: https://simonwillison.net/2026/Oct/6/llm-mistral/
3. 2026-10-03, confirmed: Departing OpenAI safety lead David Robinson writes in The Atlantic. https://postcutoff.com/e/2026-10-03-david-robinson-atlantic-openai-culture-broken/ Source: https://www.theatlantic.com/technology/2026/10/openai-safety-team-resignation/688881/
4. 2026-10-07, confirmed: Claude Haiku 5.5 released at $0.10/$0.50, matching GPT-6 Luna. https://postcutoff.com/e/2026-10-07-claude-haiku-5-5/ Source: https://www.anthropic.com/claude-haiku-5-5
5. 2026-10-07, confirmed: OpenAI brings GPT-6 to all ChatGPT users with 'Intelligent UI' answers built from interactive components. https://postcutoff.com/e/2026-10-07-gpt-6-chatgpt-intelligent-ui/ Source: https://openai.com/index/gpt-6-for-everyone/

Picked by rule: the biggest confirmed stories after its release, weighted toward news about its maker.

## Catch it up

- Briefing since September 2026: https://postcutoff.com/briefings/cutoff-2026-09-s.md
- Everything since September 2026: https://postcutoff.com/since/2026-09/
- Model ids, prices and docs: https://postcutoff.com/m/upstage-solar-mini-4/