As of: 2026-10-25 23:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/you/celeris-1/

# Celeris-1 has no published cutoff

Celeris-1 (Celeris): no published training cutoff; released 24 July 2026. Counts start at its release, so they are a floor.

- At least 1,209 AI events since its release (259 major, 38 historic), as of 2026-10-25.
- 129 AI models in the model registry released after it; 93 days of news.

## Five things it has never heard of

1. 2026-10-13, confirmed: Google releases Gemini 4 Argon broadly. https://postcutoff.com/e/2026-10-13-gemini-4-argon-general-availability/ Source: https://developers.googleblog.com/gemini-4-argon-for-robotics/
2. 2026-10-12, confirmed: Meta releases Muse Wonder and Muse Wonder Full, its first frontier-class models. https://postcutoff.com/e/2026-10-12-meta-muse-wonder/ Source: https://research.meta.ai/blog/muse-wonder
3. 2026-09-29, confirmed: OpenAI DevDay 2026 brings dots agents, GPT-6.1 Sol, Ultrafast and a $500 Pro plan. https://postcutoff.com/e/2026-09-29-openai-devday-2026/ Source: https://openai.com/index/devday-2026-recap/
4. 2026-09-08, confirmed: Meta launches Muse, a free consumer personal AI agent. https://postcutoff.com/e/2026-09-08-meta-muse-personal-agent/ Source: https://x.com/alexandr_wang/status/2106824386850521335
5. 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

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

## Catch it up

- Briefing since June 2026: https://postcutoff.com/briefings/cutoff-2026-06-s.md
- Everything since June 2026: https://postcutoff.com/since/2026-06/
- Model ids, prices and docs: https://postcutoff.com/m/celeris-1/