April 2025 Changelog

Helicone is the first observability platform to support OpenAI’s Realtime API, the 4.1 model family, and more.

Added cost support for gpt-4.1, gpt-4.1-mini, and gpt-4.1-nano, including detailed token pricing (prompt, completion, and cache read).
Redesigned the Request Drawer for better viewing of requests, responses, and key metrics.
Added support for gpt-4.1 model family in Prompts.
Added support for streaming tool use with Anthropic models.
Added stop sequences parameter support in the Parameters panel.
Added Tools Editor with streaming support when creating new tools.
Enabled evaluation runs for free tier users!
Added ability to delete datasets with confirmation modals and user notifications.
Added support for streaming tool use with Anthropic models.

Improved overall page load and view performance.
Improved dataset page loading and reliability for request/response fetching.
Improved datetime filtering with a calendar and time picker input.
Updated backend logging for smarter and more traceable logs.
Updated cache strategy to reduce database load during property filtering.
Updated the API cost calculator and model comparison pages with better design and more consistent pricing information.
Added a “Response Format Editor” component to allow users to specify JSON schema formats for responses.