Best Custom GPTs in 2026 (and Why Skills Replaced Them)
Custom GPTs failed on execution. Skills are the concept done right: portable, monetizable, secure.
Custom GPTs were supposed to be the app store for AI. OpenAI launched the GPT Store in January 2024 with the promise that anyone could build and sell custom AI tools. Two years later, the store has no revenue sharing, limited discovery, and most custom GPTs are abandoned. Skills are the concept done right: structured instruction files that work across every AI agent, not just ChatGPT.
Quick Answer: The best alternative to custom GPTs in 2026 is SKILL.md skills. Unlike custom GPTs (locked to ChatGPT, no revenue sharing, limited discovery), skills work across Claude, ChatGPT, Cursor, and 20+ agents. Creators earn 70% on every sale through the Agensi marketplace. Browse 1,500+ skills at agensi.io/skills.
Custom GPTs have three fundamental problems. First, they are locked to ChatGPT. If you switch to Claude or Cursor, your custom GPTs do not come with you. Second, OpenAI never shipped meaningful revenue sharing for GPT creators, so the best builders stopped publishing. Third, discovery in the GPT Store is broken. There is no curation, no security scanning, and no way to know if a custom GPT is safe to use with your business data.
What are SKILL.md skills and how are they different from custom GPTs?
A SKILL.md skill is a markdown file that teaches any AI agent a specific workflow. It works across Claude, ChatGPT, Cursor, and 20+ other agents. You install it once and it works everywhere. Custom GPTs only work inside ChatGPT and require OpenAI's hosting. Skills are portable files you control.
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Why are skills better than custom GPTs for business?
Portability: skills work across every major AI agent. If you switch from ChatGPT to Claude, your skills come with you. Security: skills on Agensi go through an 8-point automated security scan before listing. Revenue: creators earn 70% on every sale through the Agensi marketplace, compared to zero from the GPT Store. Curation: Agensi has 1,500+ skills across 21 categories with reviews, ratings, and install counts.
Browse all skills on Agensi.
What are the best skills to replace popular custom GPTs?
For writing: the linkedin-viral-post-copywriter and writing skills in the Writing & Content category replace custom GPT writers. For SEO: the keyword-research ($7, 89 installs) replaces SEO GPTs. For sales: the cold-email-outbound-pack replaces outreach GPTs.
Can I convert my custom GPT into a skill?
Yes. A custom GPT's instructions can be restructured into a SKILL.md format. The key difference: skills use YAML frontmatter for metadata and markdown for instructions. If you have a custom GPT that people find useful, converting it to a SKILL.md and listing it on Agensi lets you earn revenue (70% of every sale) and reach users on every AI platform, not just ChatGPT.
Is the GPT Store still active?
The GPT Store exists but has not gained meaningful traction. OpenAI has not shipped revenue sharing for creators as of 2026. Most serious builders have moved to SKILL.md-based distribution through marketplaces like Agensi where they can actually monetize their work.
How do I install skills?
# Download from Agensi, then:
unzip keyword-research.zip -d ~/.claude/skills/
Start a new session. The skill activates automatically. Browse 1,500+ skills on Agensi.