Claude Skills vs Gemini Gems vs ChatGPT GPTs: Which One Wins?

Every major AI platform now lets you create custom, reusable AI behaviors. Claude calls them Skills. Google calls them Gems. OpenAI calls them GPTs.

Same concept. Very different implementations.

If you’ve been wondering which one to invest your time in — or which platform makes it easiest to build and share custom AI tools — here’s the honest comparison after testing all three.

The Quick Answer

But the details matter. A lot.

What Each One Actually Is

Claude Skills

Skills are markdown-based instruction files that tell Claude how to handle specific tasks. You create a SKILL.md file with a name, description, and detailed instructions. Claude reads it and follows those instructions automatically whenever the task comes up.

Where they work: Claude.ai, Claude Desktop (Cowork), and the API — same skill file, no modifications needed.

How to create one:

• Type /skill-creator in Claude Desktop — Claude interviews you and builds it
• Or manually create ~/.claude/skills/your-skill/SKILL.md with instructions
• Or browse and copy from a skills directory (like ours — 1,000+ ready-made)

Key trait: File-based, portable, and built on an open standard. Anthropic published the Agent Skills spec as an open format — and over 30 platforms now support it, including Cursor, VS Code, GitHub Copilot, Gemini CLI, and OpenAI Codex. Write a skill once, use it everywhere. No platform lock-in.

Gemini Gems

Gems are Google’s version — custom AI assistants with specific instructions, tone, and behavior. You set them up through a conversational builder or by writing instructions directly.

Where they work: Gemini web app and mobile. No API access for Gems (as of March 2026).

How to create one:

• Go to Gemini > Gems (left sidebar) > “New Gem”
• Name it, write instructions, optionally add knowledge files
• Or use “Help me create” and describe what you want in plain English

Key trait: Google Workspace integration. Gems can potentially tap into Gmail, Drive, Calendar, and Docs if you’re on Google Workspace. That’s a unique angle nobody else matches for Google-first organizations.

ChatGPT Custom GPTs

GPTs are OpenAI’s take — custom chatbots you build with the GPT Builder. They were the first to market (November 2023) and have the largest ecosystem by far.

Where they work: ChatGPT web and mobile. Plus plan required to create, free plan can use some published GPTs.

How to create one:

• Go to Explore > Create a GPT
• Use the conversational GPT Builder or the manual Configure tab
• Add custom instructions, knowledge files, enable code interpreter, web browsing, or image generation
• Optionally connect external APIs via Actions

Key trait: The GPT Store. It’s the App Store of custom AI — thousands of published GPTs you can browse, use, and (theoretically) monetize. No other platform has anything close to this scale.

The Full Comparison

Here’s where the differences get real.

1. Creation Process

Winner: Gemini Gems for speed. You can create a useful Gem in under 5 minutes. But Claude Skills wins on instruction depth — no character limit means you can write genuinely detailed, multi-page skill instructions that produce much better results.

2. Customization Depth

This is where the gap gets wide.

Claude Skills can include multi-page instructions, embedded code examples, response templates, decision trees, style guides — basically anything you’d put in a document. Because they’re markdown files with no character limit, you can build skills that are 500+ lines of detailed, nuanced instructions. The skill-creator can help you write these.

Gemini Gems max out at roughly 4,000 characters of instructions. That’s enough for basic behavior customization (“always respond in Spanish,” “use formal tone”) but not enough for complex workflows.

ChatGPT GPTs give you about 8,000 characters plus the ability to upload knowledge files and connect external APIs via Actions. The API connection is unique and powerful — your GPT can call external services, databases, or tools.

Winner: Claude Skills for pure instruction depth. ChatGPT GPTs for external API connections.

3. Sharing and Distribution

Winner: ChatGPT GPTs for marketplace reach. The GPT Store has search, categories, and revenue sharing. But Claude Skills have a different advantage: the Agent Skills open standard means your skills work across 30+ platforms (Cursor, VS Code, Copilot, Gemini CLI, Codex, and more). No other format has that portability. Gems have no sharing ecosystem at all.

Our Skills Directory exists specifically because Claude Skills are portable files — 1,000+ ready-made skills you can use in Claude, Cursor, or any compatible platform.

4. Platform Integration

Winner: Claude Skills for the broadest reach. Same skill works in web, desktop (Cowork), and API. Plus local file access through Cowork is something neither competitor offers.

Gems win specifically for Google Workspace shops. If your company lives in Gmail and Drive, Gems’ native integration is compelling.

5. Pricing

Winner: Tie. All three now let free users create and use custom skills/gems/GPTs — a big shift from 2024 when everything was paywalled. The paid tiers ($20/mo across all three) give you higher usage limits and team features.

6. Privacy and Security

Claude Skills run locally on your device (Cowork) or through Anthropic’s API. Enterprise plans include SSO, audit logging, and admin controls. Skills are plain text files — no data leaves your system unless you choose to share.

Gemini Gems run through Google’s cloud. For Workspace users, Google’s enterprise data protection applies. Consumer Gems follow Google’s standard data practices.

ChatGPT GPTs run through OpenAI’s cloud. Two concerns: third-party GPTs with Actions can send data to external APIs, and knowledge files uploaded to GPTs can sometimes be extracted by determined users through prompt injection. Team and Enterprise plans offer better data controls.

Winner: Claude Skills for the privacy-conscious. Local-first architecture means your data and instructions never leave your machine unless you explicitly share them.

7. Quality of Output

This is subjective, but here’s what we’ve found after extensive testing:

Claude Skills produce the most consistent, high-quality output — largely because there’s no instruction limit. A 500-line skill with detailed examples, edge cases, and formatting rules simply produces better results than a 4,000-character Gem or 8,000-character GPT trying to squeeze the same nuance into a fraction of the space.

ChatGPT GPTs are strong when you combine instructions with knowledge files and code interpreter. The multi-modal capability (images, files, browsing, code) makes GPTs versatile.

Gemini Gems are the weakest here, mainly due to the instruction limit. They’re fine for simple behavioral changes but struggle with complex, multi-step tasks.

Winner: Claude Skills for instruction-heavy tasks. ChatGPT GPTs for multi-modal tasks.

8. Best For

What People Actually Ask

“I use ChatGPT. Is there an equivalent to Claude Skills?”

Sort of. Custom GPTs are the closest thing. The main differences: GPTs have an instruction limit (~8K chars), Claude Skills don’t. GPTs can connect to external APIs, Skills can access local files. GPTs have a marketplace, Skills are portable files you share manually. For a deeper comparison, our ChatGPT vs Claude course covers the full picture.

“Are Gemini Gems worth using?”

For simple customizations — yes, they’re the fastest to create. For anything complex, you’ll hit the instruction limit quickly. If your company uses Google Workspace, the native integration is a genuine advantage that neither Claude nor ChatGPT can match.

“Can I use multiple skills/gems/GPTs at once?”

Claude: yes — multiple skills can be active simultaneously, and Claude picks the right one for each task. Gemini: one Gem at a time. ChatGPT: one GPT per conversation, but you can mention other GPTs with @.

“Which has the best free option?”

Gemini lets free users access some Gems. ChatGPT lets free users access some published GPTs (but not create them). Claude requires Pro for any skill usage. If you’re on a free plan, ChatGPT and Gemini both give you a taste.

Our Recommendation

If you value depth and control: Claude Skills. The file-based approach, no instruction limits, and local file access (via Cowork) make it the most powerful option for anyone who takes custom AI seriously. Plus you can grab 1,000+ pre-built skills from our directory and start using them in minutes.

If you want the biggest ecosystem: ChatGPT GPTs. The GPT Store, API Actions, and multi-modal capabilities (code, images, browsing) make it the most versatile platform for building tools other people will use.

If you want the fastest setup: Gemini Gems. Five minutes from idea to working Gem. Best for personal productivity shortcuts and Google Workspace integration.

The good news? At $20/month each, you could try all three. Skills, Gems, and GPTs aren’t mutually exclusive — plenty of people use different platforms for different tasks.

Start with whichever platform you already use. And if you’re looking for ready-made skills you can copy into any platform, browse our directory — over 1,000 free skills for coding, writing, productivity, business, and more.

Level up first: Our free Prompt Engineering course teaches the frameworks that make custom skills, gems, and GPTs dramatically more effective — regardless of which platform you choose.

Related Articles

• Claude Cowork Guide 2026: Skills, Plugins, Connectors & Setup Tips — The complete guide to using Claude Skills in Cowork, including setup, plugins, and context files.
• ChatGPT vs Claude vs Gemini: 10 Tasks Tested, Clear Winner per Category — Side-by-side comparison across coding, writing, analysis, and more.
• Claude vs ChatGPT for Coding: 10 Real Tasks Tested Side-by-Side — How the two stack up on actual development work.
• Copilot Cowork Explained: Microsoft + Claude in Your Office Apps — The enterprise version of Claude’s agent technology, inside M365.
• AI Prompt Generator: How to Create Better AI Prompts in Seconds — The foundation for creating effective custom instructions on any platform.

Sources:

• Use Skills in Claude | Claude Help Center
• How to Create Custom Skills | Claude Help Center
• Claude Skills | claude.com
• Get Started with Gems | Gemini Help
• Create and Use Custom GPTs | OpenAI Help
• The GPT Store | OpenAI
• Claude Cowork Guide | FindSkill.ai
• ChatGPT vs Claude vs Gemini | FindSkill.ai