[breaking] xAI retires Grok 3, Grok 4-era, and grok-code-fast models effective May 15, 2026

xAI retired eight models from its API effective May 15, 2026 at 12:00 PM PT. Recommended replacements per the migration guide: grok-4.3 (at varying reasoning-effort levels) for the Grok 3/4 text models, grok-build-0.1 for grok-code-fast-1, and grok-imagine-image-quality for grok-imagine-image-pro. The migration page itself is undated; announced_at reflects the earliest archive.org capture of the page (2026-05-07). Effective: 2026-05-15. Migration target: xai/grok-4-3. Affected: xai/grok-4-1-fast-reasoning, xai/grok-4-1-fast-non-reasoning, xai/grok-4-fast-reasoning, xai/grok-4-fast-non-reasoning, xai/grok-4-0709, xai/grok-code-fast-1, xai/grok-3, xai/grok-imagine-image-pro. Severity: breaking. Verification: verified.