Use the best model for each job.
GPT, Claude, Gemini, Grok, DeepSeek and more in one chat. Switch whenever you like.
Your own API key
Bring your own API key: AI chat on your OpenAI, Claude or Gemini key
On Zemith Plus ($15.99/mo) or Pro ($29.99/mo), add your own OpenAI, Anthropic or Google API key and chat with GPT, Claude and Gemini on it. Those chats are billed by the provider and use no Zemith credits, on the web, iPhone and Android. Tools such as web search and image generation still use credits.
Why people chat on their own key
Read this contract and list every clause that moves risk onto us, with the clause number.
Use Claude 5.5 Opus on the Plus plan
On credits, Claude 5.5 Opus needs Pro. Add an Anthropic key on Plus and you can chat with Opus, paid by Anthropic at its API rates.
Refactor this Python module into smaller functions and explain each change.
Put long chats on the bill you already pay
If you already have credit or a company account with OpenAI, long chats on GPT 6.1 Sol run on that account and your Zemith credits stay free for images, video and web search.
Compare these two quotes from builders and tell me which one is the better deal.
Keys and credits side by side
Switch on your Google key for Gemini and keep using credits for Grok, DeepSeek and every other model. Each key has its own on/off switch.
Draft a polite reply that declines Thursday's meeting and offers two other times.
The same key on every device
Add a key once in Settings > API Keys on the web or on the API Keys screen in the iPhone and Android apps. Your chats on that provider use it everywhere you sign in.
Your key for chat, credits for everything else
Research in minutes, not hours.
Deep research reads dozens of sources and writes a report with citations.
Get finished work, not just answers.
Ask once and get docs, slides, sheets and PDFs that are ready to send.
Stop repeating yourself.
Projects keep your files, chats and instructions together, so every answer starts with context.
An assistant that remembers you.
Zemith learns your role, preferences and plans. You decide what it keeps.
One subscription.Every top AI model in one place.
Save money and stop switching between apps.
The right model for every job.
Use the latest models from OpenAI, Anthropic, Google and xAI, plus leading open models like DeepSeek, Qwen and Kimi.
Switch any time, even in the middle of a chat.
Everything you expect. Plus 50+ tools on top.
Chat, search, voice and files, plus workflows, schedules, study tools, voice and image tools. One subscription.
- Web search
- Deep research
- Chat with files
- Code sandbox
- Live voice
- Memory
- Image generation
- Video generation
- Workflow editor
- Scheduled tasks
- Image to prompt
- Remove background
- Image upscaler
- Generative fill
- Replace objects
- Text to speech
- Voice cloning
- Speech to text
- Document to podcast
- Quiz generator
- Flashcards
- Mind maps
- AI rewriter
- Humanize AI text
- Translate
- YouTube to blog
- PDF tools
- AI notes
- Whiteboard
- Slides
- FocusOS
15 subscriptions, or one.
The top models, plus image, video and voice tools, in one plan.
Without Zemith
ChatGPT PlusUS$20.00
Claude ProUS$20.00
Google AI ProUS$19.99
SuperGrokUS$30.00
Perplexity ProUS$20.00
MidjourneyUS$10.00
ElevenLabsUS$6.00
Le Chat ProUS$14.99
RunwayUS$15.00
Kling StandardUS$8.80
Gamma PlusUS$12.00
Otter ProUS$16.99
QuillBot PremiumUS$19.95
Photoroom ProUS$12.99
Quizlet PlusUS$7.99
Total if paying separatelyUS$234.70/mo
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"Updates made almost daily, feedback is incredibly fast. Just look at the changelogs — consistency."
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Questions, answered
What does bring your own API key mean in Zemith?
You paste an API key from OpenAI, Anthropic or Google into Zemith. Chats on that provider's models then run on your key: the provider bills your account at its API rates and Zemith takes no credits for them. Tools such as web search and image generation still use Zemith credits.
Which plans can use their own API key?
Both paid plans: Plus at $15.99 a month ($179.88 a year) and Pro at $29.99 a month ($299.88 a year). The Free plan runs on its 1,100 daily credits and can't add keys. You can add one key per provider, so up to three keys.
Which providers and models work with my own key?
OpenAI (GPT 6 Luna, GPT 6.1 Terra, GPT 6.1 Sol, GPT 6 Astra), Anthropic (Claude 5.5 Haiku, Claude 5.5 Sonnet, Claude 5.5 Opus) and Google (Gemini 3.5 Flash Lite, Gemini 4 Hydrogen, Gemini 4 Argon, Gemini 4 Carbon). The key always serves the exact model you picked, never a cheaper stand-in. When you add a key, Test API key shows which of these models it can use. OpenRouter keys, other providers' keys and keys for image or video models aren't supported.
What still uses Zemith credits?
Tools you use inside a chat, such as web search and image generation, plus Creative Studio, Cloud agent runs, scheduled runs and workflows. Your key covers the model's replies in normal chats and project chats. Models from other providers, such as Grok or DeepSeek, keep running on credits.
What happens if my key stops working?
The chat stops with an error that says what went wrong, for example that the provider rejected the key. Zemith never switches you to credits behind your back. Replace the key, or switch it off or remove it if you want that provider's models on credits again.
Can I use Claude Opus on Plus with my own key?
Yes. On credits, Claude 5.5 Opus is a Pro model. With your own Anthropic key on Plus you can pick it, because Anthropic bills you for it directly. The same goes for the top OpenAI and Google models your key can use.
Is my API key stored safely?
Your key is stored encrypted and only its last 4 characters are shown in the app. It is used only for your own chats on that provider. You can switch it off, replace it or remove it at any time in Settings > API Keys.
How is this different from TypingMind?
TypingMind sells a one-time licence ($39, $79 or $99) and needs your own API key for every chat. If you only chat and already pay for the API, that can cost less over the years. It has no native phone app (you add the website to your home screen), cloud sync is a separate TypingMind Cloud service, and web search starts with the $79 licence and needs its own search API key. Zemith gives you native iPhone and Android apps, built-in web search, files, image generation and plugins, credits for any model you have no key for, and Claude Opus on your own key from Plus.
Why not just use the API in the provider's console?
You can, and you pay the same API rates either way. But provider consoles are web tools for developers testing prompts, with no phone app for your chats. An API key is also billed separately from a ChatGPT Plus or Claude Pro subscription. Zemith puts the key you already fund to work in a full chat app with projects, memory, files and web search, on the web, iPhone and Android.
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