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Compatibility result

FastAPI 0.127+Python 3.15

INCOMPATIBLE

Not compatible. Evidence shows this combination does not satisfy the documented requirement — do not treat this page as a recommendation to run these versions together.

Why?

Why is FastAPI 0.127 incompatible with Python 3.15?

Requirement
Python >=3.9,<3.15
Selected version
Python 3.15
Evaluation
3.15.0 does not satisfy >=3.9,<3.15
Conclusion
INCOMPATIBLE

Evidence

CompatHub reports compatibility from upstream sources rather than making unsupported claims of its own.

Python versions

Compatibility is derived from the project's declared Python requirement (>=3.9,<3.15); it does not mean every version combination has been independently tested.

Other Python versions satisfying this requirement

FastAPI 0.127 — compatible Python lines tracked in CompatHub

Other FastAPI versions

Only lines with relevant compatibility evidence are listed.

Lifecycle context

Lifecycle status is separate from compatibility. An EOL component can still satisfy a documented version requirement.

FastAPI 0.127
Status
STANDARD SUPPORT
Python 3.15
Status
ACTIVE DEVELOPMENT
EOL
1 October 2031

Security context

Compatibility, lifecycle, and security are separate dimensions.

CompatHub does not invent vulnerability data.