Nexim - AI Playground
Not all playgrounds are for kids
Nexim - AI Playground launched on March 20, 2026.
What it does
Stop juggling tabs and guessing which AI model is best. Nexim AI Playground puts Gemini, OpenAI, and OpenRouter (Llama, Claude, DeepSeek) into one simple workspace. You can tweak system prompts and temperatures side-by-side to see real-time results. Best of all? Your API keys stay local to your browser, so your data stays private. It tracks tokens and speed for you, making prompt engineering feel less like a chore and more like a breeze. It’s AI testing, but actually organized.
Test and compare AI prompts across Gemini 3.1, GPT-4.1, DeepSeek R1, Llama 4, Qwen3 and 50+ models. Generate images, save prompts. Free, no login needed.
Test, compare and refine AI prompts across Gemini 3.1, GPT-4.1, DeepSeek R1, Llama 4, Qwen3 and 50+ more models — free, no loginfrom neximai.vercel.app
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AI Playground by Vercel Labs2023 · play.vercel.ai · ▲249Hey, Jared Palmer (creator of this playground) here. Really excited to ship this. I’ve been building this over the past few weeks to compare LLMs from different providers like OpenAI, Anthropic, Cohere, etc. At Vercel, I manage our Frameworks division (including Next.js, Svelte, and Turbo) and wanted to also dogfood some of the latest features in a slightly larger application. This playground takes a lot of inspiration from https://nat.dev and is built on Tailwind, ui.shadcn.com, and some upcoming Vercel products we’re announcing soon. We’re going to continue adding models to…
PlaygroundJul 2026 · playground.fabraix.com · ▲198We build AI agents to find vulnerabilities in other AI agents. The playground started as an internal tool that we used to test our own offensive agent Nyx. But we realised that hacking an AI is about have as wide a distribution of attacks as possible, especially those which aren't in the distribution of the models. So we are launching playground as a platform to crowdsource agent jailbreaks. And although hacking AI is super fun and we are sure people will do it for free, we want to reward those who help us push forward the offensive frontier of AI. So we are committing $100K in prizes over…
Open-Source AI Playground2023 · chathub.gg · ▲47Use and compare GPT-6, Claude 5, Gemini 3 and more chatbots simultaneously
Open Source AI Playground for Prompt Engineers2025 · playground.getsupernova.ai · ▲5Hi HN, We're a small team building AI tutors out of India, and as you might guess, this means we spend a ton of time writing, testing, and refining prompts for LLMs. When we started out, we were using the OpenAI playground but things became tedious when we wanted to compare responses from different models. We tried a bunch of other playgrounds but found them lacking in some features so we built our own. Quick Links: Github: https://github.com/supernova-app/ai-playground Hosted demo: http://playground.getsupernova.ai Demo video:…
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