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| 1 | +--- |
| 2 | +title: Trial and Error:My Experience with Gemini 3 Pro |
| 3 | +date: 2025-12-12 |
| 4 | +category: AI |
| 5 | +description: High charges with Google AI Studio API, struggles with Copilot Preview, and changes in pricing models. Thinking about how to deal with pay-as-you-go models in the AI era. |
| 6 | +tags: [Gemini, Copilot, API] |
| 7 | +recommended: true |
| 8 | +thumbnail: assets/img/gemini_icon.png |
| 9 | +--- |
| 10 | + |
| 11 | +Hello! I'm Pan-kun. |
| 12 | + |
| 13 | +This time, I've summarized my experience using Gemini 3 Pro via Copilot in the Zed IDE. |
| 14 | + |
| 15 | + |
| 16 | +## How I Burned Through 5,000 Yen in 2 Days |
| 17 | + |
| 18 | +A few days after Gemini 3 was released, information was flying everywhere about benchmarks and "I made this with this prompt," etc. |
| 19 | +I thought, "I have to try this," so without hesitation, I registered a project and API on GCP via Google AI Studio and registered the API Key in Zed... |
| 20 | + |
| 21 | +I used it relentlessly. |
| 22 | +By throwing a large amount of accurate information in the prompts, I was able to achieve my goals in seconds. |
| 23 | + |
| 24 | +About two days later, when I thought I'd take a break, I checked GCP and saw a charge of just under 5,000 yen... |
| 25 | +I was so terrified that I deleted the GCP API in seconds. |
| 26 | + |
| 27 | +Thinking calmly, it's obvious since it's a pay-as-you-go API system, but |
| 28 | +my understanding of my usage pace and the billing rate at that time was too naive. |
| 29 | + |
| 30 | +Monthly flat rates are the only way to go, after all. |
| 31 | +I can't deal with this. |
| 32 | + |
| 33 | +## Gemini 3 Pro Preview Suddenly Appears in Copilot |
| 34 | + |
| 35 | +A few days after giving up on using the API, something changed in the Copilot I usually use. |
| 36 | + |
| 37 | +> "Gemini 3 Pro Preview is available for Copilot Pro plan users and above." |
| 38 | +
|
| 39 | +Yes, naturally, I jumped on it in seconds... |
| 40 | +By the way, since Zed can link with a GitHub account, there was no need for API issuance or registration procedures, |
| 41 | +and since I didn't need to acquire or manage a Google AI Studio API Key, it was even more convenient. |
| 42 | + |
| 43 | +# Mysterious Behavior: Works Sometimes, Sometimes Not |
| 44 | + |
| 45 | +However, the joy was short-lived. |
| 46 | +While working, Copilot frequently started throwing errors and stopped responding. It became impossible to work, so I investigated. |
| 47 | + |
| 48 | +## Solution |
| 49 | + |
| 50 | +Scouring the internet, I found a large number of people suffering from the same phenomenon, |
| 51 | +and among them, I found a person who was being thanked as if they were being worshipped. |
| 52 | + |
| 53 | +To state the method simply: |
| 54 | +> Send a request with a prompt that just **reads an arbitrary file** at the very beginning of the chat. |
| 55 | +That's it. |
| 56 | +It seriously worked. |
| 57 | + |
| 58 | +The source is below, and reading this in conjunction with the official documentation made a lot of sense, but |
| 59 | +the wording in the official documentation was a bit vague. |
| 60 | + |
| 61 | +Even so, the person who analyzed this is too amazing... |
| 62 | + |
| 63 | +[CARD](https://github.com/aadishv/vscre) |
| 64 | +[CARD](https://ai.google.dev/gemini-api/docs/thought-signatures?hl=ja) |
| 65 | + |
| 66 | +# Summary? |
| 67 | + |
| 68 | +So, currently, I am able to use it thoroughly without issues. |
| 69 | +Eventually, I'd like to introduce an LLM on a home server and use a dedicated AI if possible. |
| 70 | +I hate being told I can't use things at work due to security concerns, so it's important to increase my options in advance. |
| 71 | + |
| 72 | +We can prepare for a time years from now when we can no longer say "it's faster to build it yourself," and |
| 73 | +while a future where "engineers are not needed" might not come, the possibility of "we don't need ~ engineers" arising exists, so I want to avoid resting on my laurels and getting tripped up by AI. |
| 74 | +Especially since there is a promising future ahead. |
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