AI Model
Claude Sonnet 5
byAnthropic
Rumored to be released on February, 2026
Why it's rumored
"Model-style identifier" associated with Vertex / logs and activity in prediction markets.
What to expect
Focus on coding/agentic, and price-performance improvements (e.g. similar to top models but cheaper).
Timeline
February 3, 2026
Major API outage sparks speculation
Claude Code and all API models go down with 500 errors. Twitter speculates imminent Sonnet 5 release due to infrastructure preparation.
February 2, 2026
Opus 4.5 API errors
Elevated error rates on Opus 4.5 API suggest infrastructure strain, possibly related to new model deployment.
January 15, 2026
Model ID spotted in Vertex AI
Model identifier 'claude-sonnet-5@20260203' appears in cloud service logs tied to Vertex AI, following Anthropic's naming convention.