Get access to OpenAI's Open Source Model
Try the upcoming OpenAI open‑weight reasoning model — and thousands of ChatGPT‑style alternatives — in one click on Featherless, the home for open-source AI.
First access for early subscribers
What we know so far
Latest updates from around the web
A new repo stub "openai‑o3" appears—no weights yet, but README notes MIT license.
*Last updated: 18 Jul 2025
Why pick open‑source ChatGPT— and why this model matters
Control & privacy
Keep sensitive personal, healthcare, legal, or R&D data out of third‑party logs; deploy in your VPC or on‑prem without rate caps.
Fine‑tune freedom
Open‑weight models lets fine‑tuners deeply customize behavior and teach domain knowledge.
Customization
Popular open source assistants are very extensible and often already support cutting edge features like MCP, agents, chat with docs, etc.
Pick any model from one UI
Using a ChatGPT alternative with Featherless give you the freedom to use any of the 11K+ models from a single UI. No lock-in.
Top ChatGPT Alternatives
Discover powerful open-source AI interfaces that give you full control over your conversational AI experience
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AnythingLLM
The all-in-one Desktop & Docker AI application with built-in RAG, AI Agent, No-code agent builder, MCP compatibility, and more.
LibreChat
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GPT4All
GPT4All: Run Local LLMs on Any Device. Open-source and available for commercial use.
Are there any disadvantages of using open‑source LLMs?
Open weights are powerful, but they come with trade‑offs:
Security & misuse risk
Anyone with the weights can stand up an uncensored endpoint, making it harder to police disallowed content or jailbreaks.
Operational overhead
Beyond the wrangling with GPUs, you'll also take on all the hidden chores—scaling, monitoring, and keeping everything online—that ChatGPT normally handles for you.
Featherless absorbs the ops burden and ships guardrail & evaluation tooling so you keep the upside without the headache.
What you can do with Featherless
Instant model access
Spin up OpenAI's newest open‑weight model without touching GPUs.
Try ALL the models
Compare over 11,900+ open‑source models through the same API—switch models with a single parameter.
Eval & observability
Integrations with OpenLit, LiteLLM, Dify and (coming soon) Arize let you track quality, latency and cost in real time.
Workflow automation
Build, test, and run n8n workflows without ever worrying about token costs: unlimited usage for one flat monthly price.
About Featherless
Featherless is the fastest way to run reliable, open-source AI at scale. Featherless is an AI research lab and serverless platform that gives you instant access to the world's largest model catalog without managing infrastructure, token limits, or cost creep. Whether you're building prototypes, deploying applications, or scaling intelligent systems, Featherless helps you move faster with AI you can trust. Our mission is to make personalized AGI real: open, reliable, and built for everyone.