Revise EchoKit Day 9 documentation for clarity

doc/dev/2025-12-01-echokit-day-9-chatgpt.md

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+---
+slug: echokit-30-days-day-9-chatgpt
+title: "Use OpenAI as Your EchoKit LLM Provider | The First 30 Days with EchoKit"
+tags: [echokit30days]
+---
+
+**(And today, you’ll see how easy it is to use OpenAI as your LLM provider.)**
+
+Hey everyone, and welcome back! We've covered a *ton* of ground over the past two weeks in "The First 30 Days with EchoKit." Seriously, look how much we've accomplished:
+
+  * [Getting a quick start with the pre-set EchoKit server](https://echokit.dev/docs/dev/echokit-30-days-day-1).
+  * [Figuring out how to change your EchoKit's **welcome voice**](https://echokit.dev/docs/dev/echokit-30-days-day-5-welcome-voice).
+  * [Customizing the **boot screen**](https://echokit.dev/docs/dev/echokit-30-days-day-4-bootscreen)
+  * [Learning to run the EchoKit server **locally** with Docker](https://echokit.dev/docs/dev/echokit-30-days-day-2-docker) and [from the Rust source](https://echokit.dev/docs/dev/echokit-30-days-day-3-rust).
+  * Swapping out ASR (Speech-to-Text) providers like a pro, moving between [Groq Whisper](https://echokit.dev/docs/dev/echokit-30-days-day-6-groq), [OpenAI Whisper](https://echokit.dev/docs/dev/echokit-30-days-day-7-openai), and [Local Whisper](https://echokit.dev/docs/dev/echokit-30-days-day-8-local-whisper).
+
+If you remember, everything inside EchoKit runs through that simple yet incredibly powerful pipeline: **ASR → LLM → TTS** so far.
+
+Each piece plays a crucial part in the voice AI loop:
+
+  * **ASR (The Ears):** Converts your spoken words into text.
+  * **LLM (The Brain):** Interprets that text, thinks about it, and decides what the perfect response should be.
+  * **TTS (The Mouth):** Turns the final text answer back into speech.
+
+Last week, we were all about replacing Whisper and swapping out the "ears." For the next few days, we're putting the spotlight squarely on the **middle piece: the LLM.**
+
+And today, we’re starting with the most common and powerful choice out there—**OpenAI**!
+
+### ⭐ What Exactly Does the LLM Do in the EchoKit Server? (It's the Mastermind!)
+
+The LLM is, quite literally, the **mastermind of your entire setup**. It's the engine that:
+
+  * **Instantly grasps** what the user actually wants.
+  * **Processes** all the conversational history (context).
+  * **Generates** those helpful, natural, and human-like responses.
+  * **Controls** how your EchoKit behaves during a conversation.
+  * And, yes, it calls the necessary MCP servers to get things done!
+
+EchoKit proudly **supports any provider that uses an OpenAI-compatible LLM API**. 
+
+### Step 1 — Get Your Key Ready
+
+Open up your trusted `config.toml` file and find the `[llm]` section. Replace it with this block:
+
+```toml
+[llm]
+llm_chat_url = "https://api.openai.com/v1/chat/completions"
+api_key = "YOUR_OPENAI_KEY" # Don't forget to replace this!
+model = "gpt-5-mini-2025-08-07" # Choose your favorite model here (e.g., gpt-3.5-turbo)
+history = 5
+```
+
+Here's the quick rundown on those settings, just so you know what you're tuning:
+
+  * `[llm]`: We're configuring the Large Language Model section.
+  * `llm_chat_url`: OpenAI’s chat completions endpoint.
+  * `api_key`: Get your key from the [OpenAI API platform](https://platform.openai.com/docs/overview). 
+  * `model`: Which OpenAI model should power your EchoKit's thoughts? Up to you!
+  * `history`: How many previous turns of the conversation should your EchoKit remember for context?
+
+### Step 2 — Time for a Quick Reboot!
+
+Whether you’re running your EchoKit server via Docker or from the Rust code, **go ahead and restart it right now.** That’s it! You're completely done with the server configuration. Told you it was easy!
+
+### Step 3 — Connect the New Brain to Your Device
+
+The grand finale! Time to link up your physical EchoKit device to the server with its shiny new OpenAI brain:
+
+1.  Head over to [https://echokit.dev/setup/](https://echokit.dev/setup/) and reconnect the server if you need to.
+2.  **Pro Tip:** If you only changed your LLM configuration and nothing else (URL, WiFi), you can just hit the **RST button** on your EchoKit device. It will restart and sync the new settings instantly\!
+3.  If your server URL or WiFi setup changed, you'll need to reconfigure them through the setup page, just like you did on [Day 1](https://echokit.dev/docs/dev/echokit-30-days-day-1).
+
+Next, press that K0 button and start speaking. Every clever thing your EchoKit says back to you is now being powered by OpenAI!
+
+---
+
+If you want to share your experience or see what others are building with EchoKit + local whisper:
+
+* Join the **[EchoKit Discord](https://discord.gg/Fwe3zsT5g3)**
+* Or share your latency tests, setups, and experiments — we love seeing them
+
+Want to get your own EchoKit device?
+
+* [EchoKit Box](https://echokit.dev/echokit_box.html)
+* [EchoKit DIY Kit](https://echokit.dev/echokit_diy.html)
+
+
+
+
+