§ Comparison · Updated May 2026

OpenAI API vs Together AI.

OpenAI API and Together AI are frequently shortlisted together. Both compete in the llm providers & apis space, so the right pick comes down to pricing model, ecosystem, and the specific features you'll lean on. This page lays out the spec sheet, an editor verdict, and answers to the questions people search before choosing.

§ Verdict

Highest rated

OpenAI API

Editor score 4.7/5 — leads on overall quality across our evaluation.

Best value

Together AI

freemium with paid tiers pricing — the lowest-friction option of the group.

Broadest feature set

OpenAI API

5 headline features — the most all-in-one option.

§ Spec sheet

Rating

OpenAI API

4.7

Together AI

4.3

Pricing

OpenAI API

Paid

Together AI

Freemium

Category

OpenAI API

LLM Providers & APIs

Together AI

LLM Providers & APIs

Features

OpenAI API

• GPT-4o, o1, o3 model family
• Function calling and structured outputs
• Vision, audio, and image generation APIs
• Fine-tuning and embeddings
• Batch API for cost savings

Together AI

• 200+ open-source models via single API
• Fast inference with custom infrastructure
• Fine-tuning and custom model training
• Serverless and dedicated endpoints
• Image generation with Stable Diffusion

Pros

OpenAI API

+ Largest model ecosystem and community
+ Excellent documentation and SDKs
+ Reliable uptime and fast inference

Together AI

+ Huge model selection
+ Very competitive pricing
+ Fast inference speeds

Cons

OpenAI API

− Can get expensive at scale
− Rate limits on free tier
− Closed-source models

Together AI

− Less polished than OpenAI/Anthropic SDKs
− Model quality varies
− Newer company with less track record

Use Cases

OpenAI API

Building AI chatbots and assistantsDocument processing pipelinesCode generation toolsContent creation at scale

Together AI

Running open-source models without infrastructureA/B testing different modelsCost-effective AI applicationsFine-tuning open models

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OpenAI API

Together AI

	OpenAI API Developer APIs for OpenAI models, tools, agents, realtime audio, images, and evaluation workflows.	Together AI Cloud platform for open model inference, fine-tuning, and GPU-backed AI applications.
Rating	4.7	4.3
Pricing	Paid	Freemium
Category	LLM Providers & APIs	LLM Providers & APIs
Features	• GPT-4o, o1, o3 model family • Function calling and structured outputs • Vision, audio, and image generation APIs • Fine-tuning and embeddings • Batch API for cost savings	• 200+ open-source models via single API • Fast inference with custom infrastructure • Fine-tuning and custom model training • Serverless and dedicated endpoints • Image generation with Stable Diffusion
Pros	+ Largest model ecosystem and community + Excellent documentation and SDKs + Reliable uptime and fast inference	+ Huge model selection + Very competitive pricing + Fast inference speeds
Cons	− Can get expensive at scale − Rate limits on free tier − Closed-source models	− Less polished than OpenAI/Anthropic SDKs − Model quality varies − Newer company with less track record
Use Cases	Building AI chatbots and assistantsDocument processing pipelinesCode generation toolsContent creation at scale	Running open-source models without infrastructureA/B testing different modelsCost-effective AI applicationsFine-tuning open models
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§ Best for

Pick OpenAI API for

Software developers who need building ai chatbots and assistants.

Read full review →

Pick Together AI for

AI developers who need running open-source models without infrastructure.

Read full review →

§ Common questions

OpenAI API vs Together AI — which is better?

It depends on what you're optimizing for. OpenAI API edges Together AI on our editor rating (4.7 vs 4.3), but ratings are a coarse signal. The verdict above breaks down which one wins for budget, feature breadth, and self-hosting.

Which of these is free?

Together AI is the no-cost option in this comparison (freemium with paid tiers). The rest charge per seat, per token, or by usage.

When should I pick OpenAI API over Together AI?

Pick OpenAI API when building ai chatbots and assistants matters more than Together AI's strengths in running open-source models without infrastructure. The "best for" callouts above translate this into concrete personas.

Are there other tools to consider?

Yes — every tool in this comparison has its own alternatives page that ranks the closest competitors. Click any tool name to drill into its full review and alternatives list.

§ Related comparisons

Openai Api vs Anthropic Api Deepinfra vs Together Ai

All comparisons

Editorial verdicts, not algorithmicDisagree? Tell us →