AI Daily Brief — 31 May 2025

A quiet end-of-month Saturday. Musk’s DOGE chapter formally ended. DeepSeek-R1-0528 from Wednesday continued reverberating across Hugging Face mirrors and third-party benchmark posts. OpenAI’s Codex Pro promo window closed.

Top stories

• Musk’s 130-day DOGE tenure officially ends. Friday’s Oval Office farewell completed; Saturday marks the formal end of his window as a special government employee. ‘This is not the end of DOGE, but really the beginning,’ Musk posted. Top lieutenant Steve Davis, adviser Katie Miller and general counsel James Burnham also exited. Weekend coverage framed the legacy as legal setbacks, overstated savings and little measurable efficiency gain — and previewed the Musk-Trump break over the ‘Big Beautiful Bill’ that would erupt the following week. via NPR
• DeepSeek-R1-0528 weekend reverberation. R1-0528 (released May 28 under MIT license) added system prompts, JSON output and function calling, with reduced hallucination. May 31 saw widespread Hugging Face mirroring, third-party benchmark posts and provider integrations — rather than fresh DeepSeek news.
• OpenAI Codex Pro promotion winds down. Announced end-date for the promotional window giving ChatGPT Pro ($200/mo) subscribers up to 10x extra Codex usage.

Quiet corners

No frontier-lab releases (OpenAI, Anthropic, Google DeepMind, Meta, xAI). No China-lab releases (DeepSeek, Qwen, Alibaba, Mistral). No NVIDIA / AMD product announcement. No major arxiv paper. No billion-dollar funding rounds.

By the numbers

• 130 — days Musk spent as a special government employee at DOGE
• 4 — DOGE exits (Musk, Davis, Miller, Burnham)
• 10x — Codex Pro promo usage multiplier ending today
• Most-mentioned entity: DOGE / Musk

Compiled by AI Feed’s editor from verified web sources for 31 May 2025.