Changelog

API updates and version history

This changelog documents all changes to the Caesar API. We follow date-based versioning, where each version represents a stable snapshot of the API.

Versioning approach

Caesar uses Stripe-style date-based versioning. Each version is a dated snapshot that remains stable indefinitely. You can pin your integration to a specific version and upgrade on your own schedule.

Set your API version using the API-Version header or pin it to your API key in the dashboard.

August 8, 2025

Initial API release

The first public version of the Caesar Research API.

Core features

  • Research endpoint: POST /research for creating research jobs
  • Streaming support: Server-sent events for real-time progress updates
  • OpenAI compatibility: Drop-in compatible endpoints at /compat/completions and /compat/chat/completions

Request parameters

ParameterTypeDefaultDescription
querystringrequiredThe research question
compute_unitsinteger3Number of reasoning iterations
autobooleanfalseEnable automatic parameter selection

Response fields

Each completed research job returns:

  • answer: The synthesized research response
  • results: Array of source citations with URLs and excerpts
  • compute_units_consumed: Actual units used