Custom GPTs vs Claude Projects vs Gems (2026)
Custom GPTs, Claude Projects, and Gemini Gems compared. How each provider lets you build personal AI assistants — features, limits, which plan you need.
Comparison Table
| Provider | Free Tier | Paid Tier | Plan Required |
|---|---|---|---|
| chatgpt | Use others' GPTs only | Create unlimited custom GPTs | ChatGPT Plus ($20) |
| claude | Limited Projects | Unlimited Projects with larger file context | Claude Pro ($20) or Team ($30/user) |
| gemini | Gems available free | Gems with 1M context, advanced model | Gemini AI Pro ($19.99) for full capability |
Winner: chatgpt — Custom GPTs have the deepest feature set (Actions, Knowledge, shareable URLs, GPT Store) and the largest community-built library
Best value: gemini — Gemini Gems are free at the basic tier — zero-cost entry into custom assistant workflows
TL;DR
Three nearly identical products, three different bets.
| Feature | Custom GPTs | Claude Projects | Gemini Gems |
|---|---|---|---|
| Plan needed | Plus ($20) | Pro ($20) | Free or AI Pro ($20) |
| Custom instructions | Yes | Yes | Yes |
| File knowledge | Up to 20 files | 1M context (largest) | Basic |
| Web browsing | Yes | Via search tool | Yes |
| Actions / API calls | Yes (OpenAPI) | Via MCP | No |
| Marketplace | GPT Store | None (private) | None |
| Shareable | Yes (URL) | No | No |
Winner: Custom GPTs for ecosystem depth. Best value: Gemini Gems for a free entry point. Best for long documents: Claude Projects.
What each is actually trying to be
Custom GPTs are a platform play. Publishing, distribution, Actions, and revenue share — OpenAI wants the GPT Store to be an app store.
Claude Projects are a productivity feature. Organize your work by project, keep context persistent, and put your files in the model’s context window. Anthropic explicitly rejected the marketplace model.
Gemini Gems are the lightweight option. Google pitches them as saved prompts with personality — less ambitious than either competitor, free to nearly every Gemini user.
When to use which
Use Custom GPTs when
- You want to publish a tool others can use.
- You need Actions — your GPT should call your API or a third-party service.
- You want to browse the GPT Store for a task-specific assistant.
- You’re inside the ChatGPT ecosystem already.
Use Claude Projects when
- You have a lot of files (codebase, research papers, contracts) you want every answer grounded in.
- You want long-running context on a single topic without re-uploading.
- You’re working on something private and don’t need a shareable URL.
- Your target is writing quality and nuanced reasoning over raw breadth.
Use Gemini Gems when
- You want free. Gems is the most generous free-tier custom-assistant feature.
- You work inside Google Workspace and want a Gem that knows your Drive and Gmail.
- You’re prototyping before committing to a paid subscription.
Caveats
- Custom GPTs Knowledge drift. Files upload once; update requires re-upload.
- Claude Projects quotas. Heavy file use can hit Pro-tier limits; Team tier has higher caps.
- Gems capability gap. Gems with the free model trail significantly — the value assumes you’re on AI Pro.
- Portability. None of these are portable across providers. A Custom GPT doesn’t move to Claude; a Project doesn’t move to Gemini.
The real question
Almost nobody needs all three. Pick based on the provider you already subscribe to:
- ChatGPT subscriber → Custom GPTs, no reason to look elsewhere.
- Claude subscriber → Projects; don’t pay for ChatGPT just for GPTs.
- Gemini subscriber (or free user) → Gems. Zero additional cost.
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Frequently Asked Questions
- What's the difference between Custom GPTs, Claude Projects, and Gemini Gems?
- All three let you create a personal AI assistant with custom instructions and optional file knowledge. Custom GPTs (ChatGPT) add Actions — API calls — and a public marketplace. Claude Projects emphasize persistent conversation + large file context (1M tokens). Gemini Gems are the lightest-weight and free at basic.
- Which has the best ecosystem?
- Custom GPTs by a wide margin. The GPT Store has millions of published assistants — SEO analyzers, coding helpers, legal templates, research tools. Claude Projects are private-only (no sharing). Gemini Gems sit in between but have no marketplace.
- Are Custom GPTs free?
- Using others' GPTs is free on ChatGPT Free (with message limits). Creating your own Custom GPT requires ChatGPT Plus ($20/month). Once created, you can share the URL with anyone — they'll need ChatGPT (free or paid) to use it.
- Which is best for uploading company documents?
- Claude Projects. The 1M-token context window (on Opus 4.6) means you can upload hundreds of pages of internal docs and have every answer grounded in that set. Custom GPTs Knowledge is capped lower; Gemini Gems' knowledge is smaller still.
- Can I make money from Custom GPTs?
- OpenAI has announced revenue sharing for popular GPTs in the GPT Store, but it's been limited to US builders and specific categories. Not a reliable income yet. Claude and Gemini have no equivalent.
- Which should I use for a coding assistant?
- For a one-off personal coding helper with your stack's conventions: Claude Projects (upload your codebase, set instructions). For something shareable with your team: Custom GPTs with Actions that call your dev APIs. For free experimentation: Gemini Gems.