Source: https://seerepo.com/compare/huggingface/candle/vs/openai/codex
Markdown source: https://seerepo.com/compare/huggingface/candle/vs/openai/codex.md
Description: candle and codex share 5 technologies: objc2-foundation, Tokio, image, zip, and tracing. Both are written in Rust.

# candle vs codex

candle and codex share 5 technologies: objc2-foundation, Tokio, image, zip, and tracing. Both are written in Rust.

- [huggingface/candle](https://seerepo.com/r/huggingface/candle): Minimalist ML framework for Rust
- [openai/codex](https://seerepo.com/r/openai/codex): Lightweight coding agent that runs in your terminal

## What they share and what sets them apart

- In common: objc2-foundation, Tokio, image, zip, tracing
- Only in candle: objc2-metal, candle-nn, candle-onnx, candle-transformers, safetensors, hf-hub, tokenizers, parquet
- Only in codex: axum, lru, SQLite, Sentry, tower, objc2-app-kit, Ratatui, crossterm, keyring, hmac, rmcp, png, pulldown-cmark, schemars, Pydantic, tracing-subscriber, log, tracing-appender

## Side by side

| | candle | codex |
|---|---|---|
| Size | 232,128 lines written, 398 code files | 2,320,674 lines written, 4,216 code files |
| Who writes it | 0.1% of its commits signed by AI. With Claude Code | 2.8% of its commits signed by AI. With Codex, Claude Code, and GitHub Copilot |
| Activity | Last push November 2, 2026, 2,572 commits, 21,277 stars | Last push November 4, 2026, 13,099 commits, 133,103 stars |
| Tests | 54 test files. 9.8% of its code files have a test that imports them | 2,448 test files. 51.6% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, candle or codex?

codex, with 2,320,674 lines written; candle has 232,128.

The proof: [openai/codex's code at commit 021fccb](https://github.com/openai/codex/tree/021fccb046508938c4754982efccfb51d6e8356e)

### Which has more GitHub stars, candle or codex?

codex, with 133,103 stars; candle has 21,277.

The proof: [openai/codex on GitHub](https://github.com/openai/codex)

### Which has more tests, candle or codex?

codex, with 2,448 test files; candle has 54.

The proof: [openai/codex's code at commit 021fccb](https://github.com/openai/codex/tree/021fccb046508938c4754982efccfb51d6e8356e)

### Which was updated more recently, candle or codex?

codex: its last push was on November 4, 2026, and candle's on November 2, 2026.

The proof: [openai/codex's commits on GitHub](https://github.com/openai/codex/commits)

### Which has more commits signed by AI, candle or codex?

codex: an AI signed 2.8% of its commits, with Codex, Claude Code, and GitHub Copilot; in candle, 0.1%.

The proof: [the commits each tool signed in openai/codex](https://seerepo.com/r/openai/codex/ai)

## Sources

- huggingface/candle: Read on November 5, 2026, at commit cfcbd71 (https://github.com/huggingface/candle/tree/cfcbd7186d13271843ce7eb41d25659bd0835850)
- openai/codex: Read on November 4, 2026, at commit 021fccb (https://github.com/openai/codex/tree/021fccb046508938c4754982efccfb51d6e8356e)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.