ai_grok_dark.png and ai_grok_light.png are unmodified copies of Grok_Logomark_Dark.png and Grok_Logomark_Light.png from the official xAI asset archive:

Brand guidelines: https://x.ai/legal/brand-guidelines
Asset archive: https://data.x.ai/logos/xAI_Grok_Assets.zip
Archive SHA-256: F41A93923A85047B4B5A9571B7EC73339F562C3E58ACD096E25584AB0AE2A1FB
Dark PNG SHA-256: 37DDBCB6E2A7F2E4B3BE78A7D41296A3BC7EDF6926362434EFC00DF5A56A3586
Light PNG SHA-256: 359056EE8983CFA0BA7E72795078C7C0DDF6C5D7A1870401AB960ED4F9DF9E53

xAI owns the trademark, intellectual property, and branding rights in xAI, Grok, and their logos. The xAI Brand Guidelines are usage terms, not an open-source asset license. These files are used only to identify a running grok or grok-cli process and do not imply xAI endorsement, approval, or sponsorship. The application selects the supplied dark or light file for contrast and scales it only when rendering; the committed files are unchanged.