Source: https://seerepo.com/compare/vllm-project/vllm/vs/xai-org/x-algorithm
Markdown source: https://seerepo.com/compare/vllm-project/vllm/vs/xai-org/x-algorithm.md
Description: vllm and x-algorithm share 10 technologies: FastAPI, axum, Tokio, tower, opentelemetry-api, tracing, prometheus-client, psutil, tracing-subscriber, and OpenTelemetry. vllm is written in Python and x-algorithm in Rust.

# vllm vs x-algorithm

vllm and x-algorithm share 10 technologies: FastAPI, axum, Tokio, tower, opentelemetry-api, tracing, prometheus-client, psutil, tracing-subscriber, and OpenTelemetry. vllm is written in Python and x-algorithm in Rust.

- [vllm-project/vllm](https://seerepo.com/r/vllm-project/vllm): A high-throughput and memory-efficient inference and serving engine for LLMs
- [xai-org/x-algorithm](https://seerepo.com/r/xai-org/x-algorithm): Algorithm powering the For You feed on X

## What they share and what sets them apart

- In common: FastAPI, axum, Tokio, tower, opentelemetry-api, tracing, prometheus-client, psutil, tracing-subscriber, OpenTelemetry
- Only in vllm: gitdb, pyzmq, Hugging Face, starlette, Ray, AIOHTTP, mkdocs-material, indicatif, NVIDIA, OpenAI, peft, quack-kernels, sentencepiece, torch, transformers, einops, safetensors, triton, torchvision, datasets, torchaudio, MCP, tokenizers, tiktoken, markdown, markupsafe, pymdown-extensions, pillow, image, jinja2, Pydantic, msgspec, jsonschema, pydantic-core, python-json-logger, opentelemetry-sdk, prometheus-fastapi-instrumentator
- Only in x-algorithm: confluent-kafka, rdkafka, pyarrow, Redis, arrow, object_store, moka, heed, Kafka, Google, Google Cloud Storage, google-cloud-auth, jax, optax, orbax-checkpoint, parquet, log, prometheus, env_logger, opentelemetry-exporter-otlp-proto-grpc

## Side by side

| | vllm | x-algorithm |
|---|---|---|
| Size | 2,375,117 lines written, 3,289 code files | 419,187 lines written, 929 code files |
| Who writes it | 12.8% of its commits signed by AI. With Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code | 1.5% of its commits signed by AI. With Claude Code |
| Activity | Last push November 4, 2026, 24,593 commits, 96,302 stars | Last push November 7, 2026, 65 commits, 34,122 stars |
| Tests | 2,419 test files. 60.2% of its code files have a test that imports them | 19 test files. 1.1% 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, vllm or x-algorithm?

vllm, with 2,375,117 lines written; x-algorithm has 419,187.

The proof: [vllm-project/vllm's code at commit 75f6761](https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

### Which has more GitHub stars, vllm or x-algorithm?

vllm, with 96,302 stars; x-algorithm has 34,122.

The proof: [vllm-project/vllm on GitHub](https://github.com/vllm-project/vllm)

### Which has more tests, vllm or x-algorithm?

vllm, with 2,419 test files; x-algorithm has 19.

The proof: [vllm-project/vllm's code at commit 75f6761](https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

### Which was updated more recently, vllm or x-algorithm?

x-algorithm: its last push was on November 7, 2026, and vllm's on November 4, 2026.

The proof: [xai-org/x-algorithm's commits on GitHub](https://github.com/xai-org/x-algorithm/commits)

### Which has more commits signed by AI, vllm or x-algorithm?

vllm: an AI signed 12.8% of its commits, with Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code; in x-algorithm, 1.5%.

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

## Sources

- vllm-project/vllm: Read on November 4, 2026, at commit 75f6761 (https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)
- xai-org/x-algorithm: Read on November 7, 2026, at commit 3b6919f (https://github.com/xai-org/x-algorithm/tree/3b6919f87532e57063bb3f1e85c2f509323b513e)

## 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.