workflowstacks
claude-skill

openapis – Unified Free Claude & OpenAI API Proxy for Startups

Combine Claude and OpenAI models through a single drop‑in proxy, compatible with Anthropic, OpenAI SDKs and LangChain—ideal for founders building AI‑powered products without extra costs.

From the repo · “Free Claude API + free OpenAI API in one unified proxy. Drop-in compatible with Anthropic SDK, OpenAI SDK, Claude Code CLI, OpenCode, LangChain. 100+ models (Claude Opus 4.7, Sonnet 4.6, Haiku 4.5, GPT-5.5, GPT-5.4-mini, GPT-5.3-codex). Open beta — totally free.”

84 stars+8★ this week12 forksGuide quality 9/10 · reviewed Oct 15Updated 6/2/2026100% free · open source
What it does

Provides a unified proxy for accessing free Claude and OpenAI APIs, compatible with multiple SDKs and tools

When to use it
  • •When you need to integrate AI models into your startup's application without managing multiple APIs
  • •When you want to try out different AI models, such as Claude Opus 4.7 or GPT-5.5, without setting up separate accounts
  • •When you are already using Anthropic SDK, OpenAI SDK, or other compatible tools and want to switch to a free, unified API proxy
Ready-to-paste prompt
Use the command `curl -X POST 'https://api.openapis.dev/v1/completions' -H 'Content-Type: application/json' -d '{"model": "claude-opus-4.7", "prompt": "Write a short story about a character who discovers a hidden world."}'` to generate a short story using the Claude Opus 4.7 model
Heads up: Make sure to review the open beta terms and conditions, as the service is currently free, but may have usage limits or requirements for attribution
Saves to your device
Use with Claude
New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install
Claude Code
mkdir -p ~/.claude/skills/openapis && curl -fsSL https://workflowstacks.com/api/skills/openapis/claude-skill -o ~/.claude/skills/openapis/SKILL.md
Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)
claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

Quick Actions
Details
Creator
IngARodriguez
Category
claude-skill
Published
5/2/2026

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Featured on WorkflowStacks
[![Featured on WorkflowStacks](https://workflowstacks.com/api/badge/openapis.svg)](https://workflowstacks.com/skills/openapis?utm_source=github&utm_medium=badge)
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