facebookincubator/MetaPython
This is Meta's fork of the CPython runtime. The name "cinder" here is historical, see https://github.com/facebookincubator/cinderx for the Python extension / JIT compiler. observed · 2026-08-28
Health v2 · maintenance only
77/100
- Activity 99
- Release rhythm 35
- Longevity 100
Flags: no_releases no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 1996
- days_rel: n/a
- days_push: 7
- n_releases_24m: 0
Adoption not part of the score
3789 stars · 137 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Meta's fork of the CPython runtime (historically named Cinder), maintained by Facebook Incubator. It tracks upstream Python 3.14+ and pairs with the separate cinderx project for the Python extension and JIT compiler.
Use cases
- run python with a jit compiler for faster execution
- use meta's optimized cpython fork in production
- try cinder python runtime performance improvements
- build a custom python interpreter from source
- experiment with python runtime modifications
When to choose
- you need faster python execution via jit and want a drop-in cpython-compatible runtime
- you want to experiment with or contribute to python runtime-level optimizations
- your infrastructure already uses Meta's python tooling
When to avoid
- you just need a standard python interpreter - use upstream CPython
- you depend on strict upstream CPython compatibility and third-party wheels
- you want a stable, officially supported python distribution
Facets
cli-tool · maturity active
interpreter compiler programming-languages compilers performance developer-tools windows cpp python cross-platform cpython-fork jit python-runtime meta cinder interpreter linux macos
1 source
- readme: https://github.com/facebookincubator/MetaPython · fetched 2026-08-28 · e486f7006ae6
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| facebookincubator/MetaPython | main | 77 |
For agents
markdown · JSON · MCP: product_card(name="facebookincubator/MetaPython")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem