As of: 2026-10-07 23:43 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/timeline/2025/12/

# AI in December 2025

7 events: 1 major. Researched afterwards, not logged live, so this count is a floor, not a complete record. Our agents began logging news as it happened on 29 September 2026.
Every event, newest first. Each line: date, short title, page, first primary source.

- 2025-12-11: [OpenAI releases GPT-5.2](https://postcutoff.com/e/2025-12-11-gpt-5-2/). Source: https://openai.com/index/introducing-gpt-5-2/
- 2025-12-09: [MCP donated to the Linux Foundation's new Agentic AI Foundation](https://postcutoff.com/e/2025-12-09-mcp-agentic-ai-foundation/). Source: https://www.anthropic.com/news/donating-the-model-context-protocol-and-establishing-of-the-agentic-ai-foundation
- 2025-12-08: [Genuine AI-assisted solutions to Erdős problems begin](https://postcutoff.com/e/2025-12-08-ai-erdos-problems-wave-late-2025/). Source: https://arxiv.org/abs/2510.19804
- 2025-12-06: [AxiomProver produces machine-checked Lean proofs for all 12 Putnam 2025 problems](https://postcutoff.com/e/2025-12-06-axiomprover-putnam-2025/). Source: https://github.com/AxiomMath/putnam2025
- 2025-12-06: [Arc Institute announces first Virtual Cell Challenge winners](https://postcutoff.com/e/2025-12-06-virtual-cell-challenge-2025-winners/). Source: https://arcinstitute.org/news/virtual-cell-challenge-2025-wrap-up
- 2025-12: [AI searches 100 million Hubble images in 2.5 days, finding ~1,400 anomalies including 800+ never described](https://postcutoff.com/e/2025-12-01-ai-finds-1400-anomalies-hubble-archive/). Source: https://esahubble.org/news/heic2603/
- 2025-12: [Physics Letters B paper built on a GPT-5 idea draws criticism that it tests the wrong thing](https://postcutoff.com/e/2025-12-01-hsu-gpt-5-physics-paper-dispute/). Source: https://the-decoder.com/physicist-steve-hsu-publishes-research-built-around-a-core-idea-generated-by-gpt-5/

Older: https://postcutoff.com/timeline/2025/11/
Newer: https://postcutoff.com/timeline/2026/01/