DuckDuckGo AI Chat (duck.ai, no signup, anonymous)

Just open duck.ai — no account registration, no login required — to anonymously and freely use models including Claude 4.5 Haiku, GPT-5.4 nano/mini, Mistral Small 4, gpt-oss-120b, and Gemma 4 31B

There's a daily quota limit, though the vendor hasn't published the exact figure. Once the daily quota is used up, you can continue drawing on a weekly quota; once that's also exhausted, you need to wait for it to reset (the daily quota resets at 00:00 UTC, the weekly quota resets Sunday 00:00 UTC). Conversations aren't used for model training by default; each model's own content-moderation policy applies independently, and DuckDuckGo doesn't apply additional filtering on top.

⚠️One of the lowest-barrier, no-login multi-model aggregator entry points currently available — good for a quick one-off use when you don't want to leave an account behind. The free-tier models are each vendor's lightweight versions (Haiku/nano/mini class); flagship versions (GPT-5.4, Claude Sonnet/Opus) are available only through a paid Plus/Pro subscription.