R1 Ultra
The engineer
A deep, agentic coding model. It reads your codebase, plans the change, edits files, runs the tests and fixes what fails — then tells you exactly what it did.
- Builds, edits, runs and tests software end to end
- Searches and crawls docs for current APIs, with citations
- Understands screenshots, diagrams and UI mockups
- 128K-token working memory with automatic compaction