Sustainable Substitutes for ChatGPT

The infamous chatbot by OpenAI spoiling its First Mover advantage

Reasons to avoid ChatGPT

Avoid ChatGPT due to serious privacy risks, as user data is stored, shared, and vulnerable to leaks or legal retention demands. Its massive energy and water use harms the environment, while biased, unchecked responses spread misinformation. OpenAI's support of the Department of War further undermines trust. Opt for privacy-focused alternatives.

Ethical and Sustainable ChatGPT Alternatives

  • Feasibility: How easily can the average user switch to this substitute? Higher feasibility results in a higher ranking.
  • Editor's Rating: How sustainable is the substitute? The more sustainability attributes it fulfils, the higher it is ranked.

Le Chat

An AI chatbot developed by Mistral AI, focusing on transparency and ethical AI development.

Le Chat publishes its core language models as open source. For example, Mistral Small 4 and Mistral Large 3 are released under open-source licenses, allowing for fine-tuning and deployment by the community.
Le Chat is developed by Mistral AI, a French company, ensuring compliance with GDPR and European privacy laws. Mistral has been criticised for not allowing easy opt-out possibilities to free tier users. It also uses US Tech for its infrastructure.
Mistral AI emphasises ethical AI development, with transparent policies and user-controlled data settings.
Le Chat offers hybrid deployment options, including on-premises and private cloud, giving users full control over their data.
No registration is required to use Le Chat. You can start a conversation directly on the web interface without an account.
Le Chat has a free tier. The main difference to the paid tiers are the usage limits on Flash Answers.
Website

Lumo

A privacy-friendly chatbot by Proton with zero access encryption.

No registration is required to use Lumo. You can start chatting immediately without logging in or creating an account.
Lumo is based in Switzerland and complies with GDPR, providing strong privacy protections.
Proton Lumo’s code is fully open source, allowing anyone to verify its privacy and security claims. However, the AI models used by Lumo are not explicitly stated as open source in the available information.
Lumo offers a free tier with basic features, and a Plus plan for advanced functionality.
Lumo does not log user conversations or share data with third parties, ensuring a private and secure AI experience.
Website

Duck.ai

An AI chatbot by DuckDuckGo, anonymising prompts to popular chatbot providers.

All interactions are anonymised, and chats are stored locally on the user’s device, not on DuckDuckGo’s servers. Users can delete chats instantly using the "Fire Button."
Duck.ai can be used anonymously with no log in required.
Duck.ai is free of charge. Subscription plans offer access to more advanced AI models.
Website

The 6 main issues with ChatGPT

Monopoly - Market dominance that stifles competition and limits user choice.

In 2025, ChatGPT held a dominant 82.7% share of the AI chatbot market, raising concerns about reduced competition and the concentration of power in a few hands. Source: Visual Capitalist: AI Chatbot Market Share in 2025

Privacy Concerns - User data is likely to be stored and used against users' best interest.

ChatGPT has significant privacy concerns, including data mining, lack of transparency and data breaches. User data is collected, stored, and used for training, often without clear consent or adequate anonymisation. Regulatory bodies, such as Italy's Data Protection Authority, have fined OpenAI for GDPR violations and lack of transparency in data handling. Sources: Leon Furze: Teaching AI Ethics: Privacy 2025404media: Nearly 100,000 ChatGPT Conversations Were Searchable on Google404 Media Podcast: Google Is Exposing Peoples’ ChatGPT Secrets (2025)Italian Legislation on Data Protection and Privacy: ChatGPT, The Italian Data Protection Authority closes the preliminary investigation (2024)

Big Tech - Big Tech companies do not nourish people and planet. This is especially true in times of political tension.

OpenAI is backed by major tech companies, contributing to market monopolisation. This raises concerns about potential biases in ChatGPTs output. Source: “Turning right”? An experimental study on the political value shift in large language models

Misinformation / Manipulation - Spread of false or misleading information, often through algorithmic amplification, which can harm public discourse and trust.

ChatGPT outputs racial slurs and is - like all other AI tools - vulnerable towards fake news, bias and political cencorship. Sources: Wired: OpenAI Designed GPT-5 to Be Safer. It Still Outputs Gay Slurs (2025)Wired: Chatbots Are Pushing Sanctioned Russian Propaganda (2025)TechCrunch: Trump’s Silicon Valley advisers have AI ‘censorship’ in their crosshairs (2024)

Support of Authoritarian Regimes - Companies actively supporting, financing and legitimising regimes and unethical policies.

OpenAI is cooperating with the US Department of War (sic) under conditions that had been neglected by Anthropic previously.Source: TechCrunch: OpenAI’s Sam Altman announces Pentagon deal with ‘technical safeguards’ (2026)

No Carbon Neutrality Goals - No goals for carbon neutrality is a bad sign as it shows lack of commitment to holding crucial thresholds for global climate warming.

ChatGPT's newest model seems to consume much more energy than its predecessor. This aligns with OpenAI's lack of commitment towards carbon neutrality goals.Source: Tom's Hardware: ChatGPT 5 power consumption could be as much as eight times higher than GPT 4 ... (2025) OpenAI: Environmental Impact of AI (2025)