Meta published the engineering bill for its new AI campus, and the most revealing number is not the size — it is the slack.
AspireAI community · engineering.fb.com
Meta published the engineering bill for its new AI campus, and the most revealing number is not the size — it is the slack.
Prometheus is Meta's gigawatt-scale supercluster in New Albany, Ohio. Phase one is done and already trained the Muse models; the full build targets roughly one million GPUs behaving as a single machine. Meta reports more than 85% goodput on pre-training and above 90% on reinforcement learning for Muse Wonder.
Here is the part worth stealing. Moving from 8-GPU to 72-GPU racks widened the fault blast radius ninefold, so Meta's answer was redundancy over speed: each rack runs a 64-GPU slice and keeps 8 GPUs in reserve. When one dies, a spare takes over and the job restarts from its last checkpoint instead of stalling for a repair truck. For a 32,768-GPU run that means provisioning about 13% more hardware than you actually need.
Read the story and explore more from the AspireAI community.
Two critical PHP remote code execution flaws — one found by GPT-5.6 Sol — were patched on October 21, 2026, and OpenAI published a disclosure framework alongside the fix. Fixed versions: PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35. Both allow unauthenticated remote code execution, and PHP's advisory says risk is highest for mod_php, where a demonstrated exploit triggers before any application code runs. The CVEs are distinct failure modes. CVE-2026-109618 (OOM corruption): out-of-memory handling can interrupt PHP while internal request data is only partially initialized, and request cleanup may then treat the invalid data as valid. CVE-2026-109619 (stale global state): request-owned internal state can survive after its backing memory is freed, and a later request served by the same worker may use that stale state. OpenAI states GPT-5.6 Sol identified the first flaw through its Patch the Planet initiative, and that Wiz independently discovered and reported both vulnerabilities. PHP's maintainers led the fixes and release, with Wiz, Cloudflare and OpenAI contributing research and coordination. Wiz's write-up adds that it used GPT-5.6 Sol and Gemini 4 Argon throughout, with Gemini 4 Argon contributing to finding the vulnerability and validating the patch. OpenAI describes the gap between discovery and public exploitation as a "Defender's Window," proposes a five-stage response framework, and committed $1 billion in subsidised Daybreak model access for organizations with limited security resources. Honest caveats: these are OpenAI's and Wiz's own characterizations, and OpenAI also notes the same capabilities help attackers build offensive tooling faster. PHP 8.1 and older no longer receive updates from the PHP project.