What are closed-source LLMs?
Closed-source LLMs are built by OpenAI, Anthropic, Google, and xAI. They run on powerful server infrastructure and deliver the highest quality reasoning, writing, and analysis available today.
How closed-source LLMs work
A large language model (LLM) is the AI engine that powers tools like ChatGPT, Claude, and Gemini. It reads your text, understands the context, and generates a response.
A closed-source LLM is one where the source code and model weights are proprietary. This means:
- The company that built it controls how it works and what data it processes
- You rely on their privacy policy and terms of service for data handling
- They run on powerful enterprise servers, enabling capabilities that would be impractical on personal devices
- They typically deliver the highest quality output because of massive training budgets and proprietary techniques
Examples on Anuma:ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google), Grok (xAI).
Closed-source vs open-source LLMs
Two approaches to AI, both included in every Anuma plan.
Open-Source LLMs | Closed-Source LLMs | |
|---|---|---|
| Source code | Publicly available, auditable | Proprietary, not inspectable |
| Who builds them | Open research labs, communities | OpenAI, Anthropic, Google, xAI |
| Data retention | Zero on Anuma. Nothing stored | Minimized on Anuma. Encrypted in transit |
| Where they run | Your device or trusted infrastructure | Provider servers with enterprise hardware |
| Transparency | Full. You can verify everything | Limited. You trust their privacy policy |
| Best for | Coding, math, privacy-sensitive work | Creative writing, complex reasoning, nuanced analysis |
| Quality | Rivals closed-source on coding/math | Generally leads on creative/nuanced tasks |
| On Anuma | All included in every plan | All included in every plan |
Why closed-source LLMs are powerful
The advantages that keep closed-source LLMs at the frontier of AI capability.
Maximum capability
Closed-source LLMs are trained with billions of dollars in compute, proprietary data, and techniques that aren't publicly available. The result is the highest quality reasoning, writing, and creative output available today.
Continuous improvement
Companies like OpenAI and Anthropic employ thousands of researchers constantly improving their models. You get the benefit of that investment without doing anything.
Enterprise reliability
These models run on infrastructure designed for 99.9%+ uptime, handling millions of requests simultaneously. Speed and availability are guaranteed.
Available closed-source LLMs on Anuma
Access every leading AI model from a single account. New models are added as they launch.
ChatGPT
OpenAIThe most widely used AI in the world. Strong across general tasks, creative writing, brainstorming, and conversation. The benchmark that other models are measured against.
Claude
AnthropicKnown for nuanced, careful thinking. Excels at long documents, detailed analysis, and following complex multi-step instructions. Produces the most natural-sounding prose.
Gemini
GoogleBuilt for research and multimodal understanding. Strong at synthesizing information from multiple sources and providing answers grounded in recent search data.
Grok
xAIFast, direct, and conversational. Good for quick answers, real-time information, and a less filtered communication style.
Who uses closed-source LLMs?
Closed-source LLMs serve anyone who needs the highest quality AI output.
Writers and content creators
The most polished prose, best tone control, and strongest creative output. Claude for nuance, ChatGPT for versatility, Gemini for research-backed content.
Knowledge workers
Complex analysis, report writing, strategy documents, and presentations. Closed-source LLMs handle multi-step reasoning and long-context tasks best.
Students and researchers
Research synthesis, essay writing, study aids, and concept explanation. Gemini for search-grounded research, Claude for careful analysis.
Entrepreneurs
Business plans, pitch decks, market analysis, investor updates. Closed-source LLMs excel at polished, strategic output.
Everyone
For everyday questions, creative projects, and general productivity, closed-source LLMs offer the broadest and most capable experience.
All your AI in one place.
No more juggling tabs, logins, and subscriptions. One app, one interface, every leading LLM. ChatGPT, Claude, Gemini, Grok, and open-source LLMs all accessible from the same conversation.
ChatGPTClaudeGeminiGrok
DeepSeek, Kimi, MiniMax + moreYour memory follows across every model.
Switch from Claude to ChatGPT mid-conversation. Your context, preferences, and history carry across automatically. No re-explaining.
Council Mode.
Not sure which LLM will give the best answer? Run the same prompt on up to four at once. Compare responses side by side. Pick the best.
ClaudeChatGPTGeminiGrokFrequently asked questions
Everything you need to know about closed-source LLMs on Anuma.
A large language model where the source code is proprietary and controlled by the company that built it. ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google), and Grok (xAI) are all closed-source LLMs.
ChatGPT, Claude, Gemini, and Grok. All are included in every plan. New models are added as they become available.
Closed-source LLMs are proprietary and run on provider servers. They generally deliver the highest capability for creative and reasoning tasks. Open-source LLMs have publicly available code, run with zero data retention, and rival closed-source on coding and math.
Anuma minimizes data sharing with providers and never trains on your conversations. All data is encrypted in transit. For tasks requiring zero data retention, switch to open-source LLMs.
No. Anuma includes every closed-source and open-source LLM in a single subscription. No separate accounts for OpenAI, Anthropic, or Google needed.
Yes. One tap. Your Memory Vault carries your context across both. Use closed-source for maximum capability and open-source for maximum privacy.
ChatGPT for general tasks and creative work. Claude for writing quality and complex instructions. Gemini for research and multimodal tasks. Grok for quick, conversational answers. On Anuma, Council Mode lets you try all four at once.