🚨 Vertex AI error log showing model ID claude-sonnet-5@20260203

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Claude Sonnet 5: The “Fennec” leaks:

Fennec Codename: Leaked internal codename for Claude Sonnet 5, reportedly one full generation ahead of Gemini’s “Snow Bunny.”

Imminent Release: A Vertex AI error log lists claude-sonnet-5@20260203, pointing to a February 3, 2026 release window.

Aggressive Pricing: Rumored to be 50% cheaper than Claude Opus 4.5 while outperforming it across metrics.

Massive Context: Retains the 1M token context window, but runs significantly faster.

TPU Acceleration: Allegedly trained/optimized on Google TPUs, enabling higher throughput and lower latency.

Claude Code Evolution: Can spawn specialized sub-agents (backend, QA, researcher) that work in parallel from the terminal.

“Dev Team” Mode: Agents run autonomously in the background you give a brief, they build the full feature like human teammates.

Benchmarking Beast: Insider leaks claim it surpasses 80.9% on SWE-Bench, effectively outscoring current coding models.

Vertex Confirmation: The 404 on the specific Sonnet 5 ID suggests the model already exists in Google’s infrastructure, awaiting activation.

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