Claude Skills vs ChatGPT Custom GPTs: Which One Should You Use?

Both Anthropic and OpenAI now offer ways to extend their AI with specialized capabilities. Claude has Skills. ChatGPT has Custom GPTs. They sound similar on the surface, but the design choices behind them lead to very different experiences.

Let us break it down honestly.

The Core Difference

A Custom GPT is a separate chatbot you switch into. You leave your main ChatGPT thread, enter a custom one, and that GPT handles the task until you switch back.

A Claude Skill loads dynamically inside your current conversation. Claude detects when a Skill is relevant and pulls it in automatically without breaking your flow.

That single architectural choice changes everything downstream.

Head-to-Head Comparison

Activation

Custom GPTs: Manual. You pick one from a menu.

Claude Skills: Automatic. Claude picks the right Skill based on context.

Context Continuity

Custom GPTs: Each GPT has its own thread and memory.

Claude Skills: All Skills share the same conversation, so context stays intact.

Composability

Custom GPTs: You use one at a time.

Claude Skills: Multiple Skills can stack in a single response.

Transparency

Custom GPTs: Hidden system prompts, no visibility into instructions.

Claude Skills: Open structure. You can inspect a Skill before installing.

Creation Effort

Custom GPTs: Build through a chat-based configurator.

Claude Skills: Write a SKILL.md file with instructions and resources.

When to Choose Custom GPTs

You want a polished, single-purpose chatbot for end users

You are already deep in the OpenAI ecosystem

You prefer a no-code configuration experience

When to Choose Claude Skills

You want capabilities that compose naturally during real work

You value transparency and inspectable behavior

You need expertise to load on demand without switching tools

Real-World Example

Imagine you are writing a technical blog post.

With a Custom GPT you would switch to a writing GPT, get a draft, leave it, switch to an SEO GPT, copy the draft over, get suggestions, then go back.

With Claude Skills you ask once. The writing Skill drafts the post and the SEO Skill optimizes it in the same response.

The Verdict

Neither is objectively better. They serve different philosophies.

Custom GPTs feel like apps. Claude Skills feel like teammates who show up exactly when needed.

If your work is fluid and crosses many domains, Skills win on flow. If you want a discrete, packaged assistant for one specific job, Custom GPTs do that cleanly.

Try both, then trust your workflow to tell you which fits.