Hand off complex coding tasks without losing control
Cosine is built for real software work: refactors, bug fixes, tests, migrations, documentation, and long-horizon implementation across production codebases.
From prompt to pull request-ready work
Cosine follows an engineering workflow that mirrors how strong developers work.
1. Understand the codebase
Cosine explores the repository, reads relevant files, and builds context before making changes.
2. Plan the work
For non-trivial tasks, Cosine breaks the work down into steps so engineers can understand the approach before reviewing the output.
3. Make targeted edits
Cosine changes the files required for the task without broad, unrelated rewrites.
4. Run checks
Cosine can run tests, builds, linters, or targeted commands to verify that the work behaves as expected.
5. Return a reviewable diff
Every change remains visible to the engineer. You decide what gets accepted, edited, or rejected.
Delegate real engineering work
Cosine is designed for the work that slows teams down when it piles up, but still requires engineering judgment.
Refactors
Modernise code, simplify flows, update APIs, and make targeted structural changes while preserving behaviour.
Bug fixes
Investigate failures, trace the source of an issue, patch the code, and verify the result.
Codebase exploration
Ask Cosine to explain unfamiliar systems, trace execution paths, or identify where a change should be made.
Migrations
Move code between libraries, frameworks, APIs, or internal patterns with less manual repetition.
Documentation
Generate or update documentation from the codebase, including setup notes, architectural explanations, and usage examples.
Long-horizon implementation
Use Cosine for larger tasks that require planning, multiple edits, checks, and iteration.
Powered by Lumen
Cosine is not just a wrapper around generic coding models.
The coding agent is built around Lumen, Cosine’s model family trained for production software engineering behaviour: repository understanding, implementation quality, enterprise-language coverage, and maintainable code generation.
That means Cosine is optimised for the work engineering teams actually review:
- Cleaner diffs
- Better repository fit
- Stronger long-context task execution
- Less AI slop
- More useful planning and verification behaviour
- Better performance on niche and enterprise languages