AI News Digest — March 31, 2026 — MCP App Store

Monday ended the month with two significant announcements — one of the largest funding rounds in AI history and a major open-source milestone.

Today's stories:

OpenAI Raises $122 Billion (OpenAI News) — OpenAI closed a $122B funding round to accelerate frontier AI development, expand global compute infrastructure, and meet surging demand for ChatGPT, Codex, and enterprise products. One of the largest private funding rounds ever — a signal that AI infrastructure investment is nowhere near peaking.
TRL v1.0: Post-Training Library Hits Stable Release (Hugging Face) — Hugging Face's TRL library — the go-to toolkit for RLHF, DPO, PPO, and alignment fine-tuning — reached v1.0 with stable APIs and production-ready status. For teams training or aligning open-source models, this is the clearest endorsement yet that TRL is the standard stack.

Accelerating the next phase of AI — OpenAI raises $122B

OpenAI announced a $122 billion funding round to expand frontier AI globally, invest in next-generation compute infrastructure, and meet growing demand for ChatGPT, Codex, and enterprise AI products. One of the largest private funding rounds in history, signalling continued massive investment in AI at the frontier.

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TRL v1.0: Post-Training Library Built to Move with the Field

Hugging Face released TRL v1.0 — a major milestone for their post-training library covering RLHF, DPO, PPO, and other alignment techniques. The v1.0 release signals API stability and production readiness for teams fine-tuning and aligning open-source models. The go-to library for post-training just became officially stable.

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AI News — March 31, 2026

Accelerating the next phase of AI — OpenAI raises $122B

TRL v1.0: Post-Training Library Built to Move with the Field