These tools competes with

Together AIvsOpenAI API

Fast inference API for open-source models versus GPT-5 era models, embeddings, and Responses API from OpenAI

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Choose Together AI when…

  • •You want fast, affordable inference on open models
  • •Fine-tuning on open-source models is on your roadmap
  • •You need a scalable alternative to OpenAI for open models

Choose OpenAI API when…

  • •You need the broadest ecosystem and most integrations
  • •GPT-4 or o-series reasoning models are required
  • •Assistants API, fine-tuning, or batch API are needed

Side-by-side comparison

Field
Together AI
OpenAI API
Category
LLM Infrastructure
LLM Infrastructure
Type
Commercial
Commercial
Free Tier
✓ Yes
✗ No
Pricing Plans
API: Per token
API: Per token
GitHub Stars
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—
Health
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Together AI

Inference API with 200+ open-source models at competitive speeds. Popular for running Llama, Mistral, and other open models at scale.

Website ↗

OpenAI API

API access to GPT-5, GPT-5.5, o3/o4 reasoning models, and the Responses API; plus embeddings, image, audio, and Realtime endpoints. The most widely deployed LLM API in production.

Website ↗

Shared Connections2 tools both integrate with

LiteLLMGroq

Only Together AI (6)

OpenRoutervLLMFireworks AIOpenAI APIHuggingFaceDeepInfra

Only OpenAI API (37)

CrewAIAutoGenLlamaIndexLangChainPydanticAIsmolagentsAgnoMastraPortKeyLangfuse

Explore the full AI landscape

See how Together AI and OpenAI API fit into the bigger picture — 235 tools, 543 relationships, all mapped.

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