These tools competes with

OpenAI APIvsTogether AI

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

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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

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

Side-by-side comparison

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

Together AI

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

Website ↗

Shared Connections2 tools both integrate with

LiteLLMGroq

Only OpenAI API (37)

CrewAIAutoGenLlamaIndexLangChainPydanticAIsmolagentsAgnoMastraPortKeyLangfuse

Only Together AI (6)

OpenRoutervLLMFireworks AIOpenAI APIHuggingFaceDeepInfra

Explore the full AI landscape

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

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