Together AI vs vLLM: Which is Better in 2026?
Choosing between Together AI and vLLM comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Together AI is our overall pick for AI & automation workflows. Pick vLLM if you need AI model deployment.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Together AI
Run open-source LLMs with serverless inference and fine-tuning
Best for you if:
- • You need AI & automation features specifically
- • Together AI is an inference platform for open-source AI models
- • It provides fast, affordable access to leading open models
vLLM
Fast LLM serving with PagedAttention
Best for you if:
- • You need something completely free
- • You need AI model deployment features specifically
- • vLLM is a high-throughput LLM serving library optimized for inference
- • It achieves 24x higher throughput than HuggingFace with PagedAttention
| At a Glance |  Together AI |  vLLM |
|---|---|---|
Starts at | Custom | FreeFree tier available |
Best For | AI & Automation | AI Model Deployment |
Rating | 4.8/5 | - |
Free plan | No | Yes |
Choose Together AI or vLLM?
Choose Together AI if
Run open-source LLMs with serverless inference and fine-tuning
- Many open models
- Competitive pricing
- Fast inference
- Your work is AI & automation-shaped, not AI model deployment-shaped
Choose vLLM if
Fast LLM serving with PagedAttention
- Fast LLM inference
- Open source
- Good performance
- You want a fully free tool (Together AI requires payment)
- Your work is AI model deployment-shaped, not AI & automation-shaped
| Feature | Together AI | vLLM |
|---|---|---|
| Pricing Model | Paid | Free |
| User Rating | ★4.8/5 5 reviews | No ratings yet |
| Categories | AI & AutomationCloud & Infrastructure | AI Model DeploymentGPU Cloud |
In-Depth Analysis
Together AI
Run open-source LLMs with serverless inference and fine-tuning
Together AI's serverless inference pricing is competitive for open-source models, with Llama 3.1 405B at $3.50/1M tokens being notably cheaper than most proprietary API alternatives for frontier models, while the GPU cloud and fine-tuning tiers are in line with market rates for on-demand compute.
Watch out
No free tier or credits for testing
Strengths
- +Many open models
- +Competitive pricing
- +Fast inference
- +Good for startups
- +Fine-tuning available
Weaknesses
- -Smaller than big providers
- -Model quality varies
- -Support basic
- -Documentation gaps
- -Newer platform
Key features
vLLM
Fast LLM serving with PagedAttention
vLLM offers an exceptionally generous pricing model as it is entirely free and open-source.
Watch out
Requires self-hosting infrastructure (GPUs, servers)
Strengths
- +Fast LLM inference
- +Open source
- +Good performance
- +Active development
- +Good for production
Weaknesses
- -Hardware requirements
- -Setup complexity
- -Learning curve
- -Documentation improving
- -Still maturing
Key features
Pricing: Together AI vs vLLM
| Plan | Together AI | vLLM |
|---|---|---|
| Tier 1 | Serverless Inference | Free Free |
| Tier 2 | Fine-Tuning | N/A |
| Tier 3 | GPU Cloud | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Together AI pricing and vLLM pricing.
Who Should Use What?
On a budget?
vLLM is free. Together AI is paid.
Go with: vLLM
Want the highest-rated option?
Together AI is rated 4.8/5. vLLM has no ratings yet.
Go with: Together AI
Value user reviews?
Together AI: 5 reviews (4.8/5). vLLM: no ratings yet.
Go with: Together AI
3 Questions to Help You Decide
What's your budget?
Together AI is paid. vLLM is free. Go with vLLM if free matters most.
What's your use case?
Together AI is a AI & automation tool. vLLM is in AI model deployment. Pick the category that matches your needs.
How important are ratings?
Together AI is rated 4.8/5; vLLM has no ratings yet.
Key Takeaways
Together AI
- Our pick for this comparison
vLLM
- Completely free
- Better fit for AI model deployment
The Bottom Line
Together AI is our pick. That said, vLLM is free, hard to beat on price.
Frequently Asked Questions
Is Together AI or vLLM better?
Together AI is rated in our evaluation. Together AI is paid and vLLM is free.
What are Together AI and vLLM used for?
Together AI: Run open-source LLMs with serverless inference and fine-tuning. vLLM: Fast LLM serving with PagedAttention.
What does Together AI cost vs vLLM?
Together AI is a paid tool. vLLM is completely free. Visit their websites for detailed pricing.