AI Insight Log

Feb 2, 2026 · Artificial Intelligence

Is Claude Sonnet 5 (Fennec) Really Coming? Leaked Specs Suggest Performance May Beat Opus 4.5

A leaked Google Vertex AI log reveals a new model ID claude‑sonnet‑5@20260203, hinting at a Feb 3 2026 release of Claude Sonnet 5 (code‑named “Fennec”) that reportedly scores over 82 % on SWE‑Bench, outperforms Opus 4.5, keeps the same pricing, and introduces a “Dev Team” mode with parallel sub‑agents for coding tasks.