Vertex AI Rebranded as Gemini Enterprise Agent Platform with Breaking SDK Changes

The rebrand is structural, not cosmetic: developers report that 'every new capability ships through the Agent Platform, not Vertex AI,' with model training now nested under agents as the primary developer container. New Managed Agents collapse what were multi-step self-managed loops into single API calls, billed by execution time and tool-call volume, and add Agent Identity and Agent Gateway security primitives.

The catch is migration pain: new SDK package names and endpoint URLs require manual rework, particularly for streaming responses and safety settings, ahead of a hard June 24 Vertex deprecation deadline. On r/googlecloud, developers flagged the deadline and the rework but characterized the migration path as otherwise straightforward — structural disruption rather than a dead end.

The move reflects an industry-wide pivot to agent-first platforms, positioning Google against AWS Bedrock AgentCore/Strands and Azure's agentic tooling. Pricing by execution time and tool calls also shifts cost modeling away from per-token toward per-task economics, which enterprises will need to re-forecast. Watch next: whether the June 24 deadline slips under migration pressure, and how the execution-time pricing compares with rivals for long-running agent workloads.