These tools competes with

OpenAI APIvsAnthropic API

GPT-5 era models, embeddings, and Responses API from OpenAI versus Claude models API by Anthropic

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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 Anthropic API when…

  • •You need long context windows (200k tokens)
  • •Safety, reliability, and reasoning quality matter most
  • •You're building agents that require deep code understanding

Side-by-side comparison

Field
OpenAI API
Anthropic API
Category
LLM Infrastructure
LLM Infrastructure
Type
Commercial
Commercial
Free Tier
✗ No
✗ No
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 ↗

Anthropic API

API access to Claude model family including Claude 3.5 Sonnet, Haiku, and Opus. Excels at coding, analysis, long-context tasks, and safety-critical applications.

Website ↗

Shared Connections16 tools both integrate with

CrewAIAutoGenLlamaIndexLangChainPydanticAIsmolagentsAgnoMastraLiteLLMPortKeyHeliconeMistral APIVercel AI SDKStainlessGoogle Gemini APIDeepSeek API

Only OpenAI API (23)

LangfuseAnthropic APICohere APIGroqTogether AIPromptFooDeepEvalManus AILettaAzure OpenAI

Only Anthropic API (5)

OpenAI APIAmazon BedrockAmazon Q DeveloperClaude Agent SDKAnthropic Computer Use

Explore the full AI landscape

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

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