Vercel Flags now supports JSON values
Vercel just made it 10x easier to A/B test AI models in production. One flag instead of three.
Why it matters
Vercel Flags now supports JSON values, enabling developers to manage complex AI model configurations (temperature, max_tokens, model selection) as a single feature flag. This simplifies progressive rollouts and A/B testing for AI applications, reducing operational overhead for teams shipping model experiments.
The key facts
8 to knowVercel Flags extended to support JSON values (previously: boolean, string, number only)
Use case: A/B test model performance with single flag instead of managing multiple related flags
Enables progressive traffic routing to new models and quick provider failover
Collapses multi-flag management (e.g., ai_model, ai_temperature, ai_max_tokens) into one configuration object
Vercel Flags now supports JSON values (previously: boolean, string, number only)
Use case: A/B test different LLM models with single flag instead of managing separate temperature, max_tokens, model_id flags
Supports progressive traffic routing and rapid model provider failover
Collapses multiple related flags into one unified configuration object
Go to the source
Vercel Blogvercel.com
Publisher excerpt: You can now store JSON values in , extending the existing support for boolean, string, and number values. This allows you to collapse what used to take several related flags into a single feature flag.Vercel Flags For example, to A/B test how a different model performs, you can now define a single…