Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkillsArcadeCompare › Anthropic vs OpenAI

AnthropicvsOpenAI

Two ai providers for the Claude Code ecosystem — side-by-side metadata, tag overlap, install commands, and when to reach for each.

Anthropic

Claude model family — the default Claude Code provider. Sonnet, Opus, Haiku.

License
proprietary
Install
env key
Website
https://www.anthropic.com
GitHub
https://github.com/anthropics
View Anthropic →
export ANTHROPIC_API_KEY=...

OpenAI

GPT-5, o-series reasoning models, and the function-calling API baseline.

License
proprietary
Install
env key
Website
https://openai.com
GitHub
https://github.com/openai
View OpenAI →
export OPENAI_API_KEY=...

Shared tags

llm-provider

Only in Anthropic

anthropic claude

Only in OpenAI

gpt openai

When to reach for which

Anthropic — Claude model family — the default Claude Code provider. Sonnet, Opus, Haiku.

OpenAI — GPT-5, o-series reasoning models, and the function-calling API baseline.

Both sit in the AI Providers category — they're substitutes, not complements. Pick by your install constraint (MCP-native, license, hosting model) and which tag overlap matters most to your stack.

More AI Providers comparisons

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