vLLM vs Together AI
Both are free/open-source alternatives to OpenAI API (ChatGPT). Here's how they stack up — verified facts, no spin.
vLLM
High-throughput serving for production-grade local inference.
vLLM is a fast inference and serving engine built for throughput, using paged attention to serve many concurrent requests efficiently. It is the choice when a team needs to self-host models at real scale.
Together AI
One API for the whole open-model universe — Llama, DeepSeek, Qwen and more.
Together AI is a hosted inference cloud for open models: one OpenAI-compatible API serving Llama, DeepSeek, Qwen, Mistral and dozens more, priced from about $0.05 to $9 per million tokens (Llama 3.3 70B around $0.88). The platform itself is commercial, but everything it serves is open-weight — so unlike a closed lab API, your exit is real: the same model you call today can run on your own GPUs tomorrow. A strong bridge for teams not ready to operate vLLM themselves.
Side by side
| vLLM | Together AI | |
|---|---|---|
| Sovereignty Score | 88 | 46 |
| Open source | Yes | No |
| Self-hostable | Yes | No |
| Local-first | Yes | No |
| License | Apache-2.0 | Proprietary (platform); serves open-weight models |
| Pricing | Free / self-host | Usage-based, ~$0.05–$9 per 1M tokens by model; intro credits for new accounts |
vLLM edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
vLLM
Strengths
- +Excellent throughput under concurrency
- +OpenAI-compatible server mode
- +Backed by a large community
Trade-offs
- −Aimed at capable GPUs, not laptops
- −Steeper operational learning curve
Together AI
Strengths
- +Huge open-model catalog behind one OpenAI-compatible API
- +The models are open — migrating to self-hosting later is realistic
- +Often far cheaper than closed frontier APIs for comparable tasks
Trade-offs
- −A hosted US cloud — your prompts transit their infrastructure
- −Quality/cost varies widely across the catalog; you do the picking
More OpenAI API (ChatGPT) head-to-heads
Facts verified 2026-07-04. Licenses and pricing change — spotted something out of date? That's a correction we want.