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