Claude (Anthropic):

Sign up here: https://console.anthropic.com/dashboard

Then click "Get API Keys" and create a key.

ChatGPT (OpenAI):

Go here: https://platform.openai.com/

If you've never signed up for OpenAI before, click "Sign up".

Follow the prompts, and be sure to create an API key and also to add a credit card with a few dollars, otherwise it won't work.

Gemini

Go here: https://aistudio.google.com/app/apikey

And click the "Create API key" button.

DeepSeek

Sign up here: https://platform.deepseek.com/

Then click on "API Keys" and create a key.

This is also where you tell the model which output to return, which you'll need in Step 4.

Example System Prompt:

You are an experienced German teacher who is helping me practice grammar.
You will be provided with a German word.  Respond with:
-an "exampleSentence" at A2 or B1 level about 10-15 words long using the provided German word, and
-the "translation" of that sentence into English

In the above prompt, the model will return "exampleSentence" and "translation", which you'll use in step 4.

You are an experienced German teacher who is helping me practice grammar.  You will be provided with a German word.  Respond with:
-an "exampleSentence" at A2 or B1 level about 10-15 words long using the provided German word, and
-the "translation" of that sentence into English

EXAMPLE JSON OUTPUT:
{
    "exampleSentence": "Mein Bruder kommt aus den USA.",
    "translation": "My brother is from the USA."
}

Example User Prompt:

{de_sentence}

In our example it's an "exampleSentence" and a "translation", but you can ask the LLM for any information and call it whatever you want.

In the "Save the Output" part, match the information to Fields on your Cards. For example:

exampleSentence de_sentence
translation     en_sentence

In our example, the LLM returns:

• an "exampleSentence", which gets saved to the "de_sentence" field on our card
• a "translation", which gets saved to the "en_sentence" field on our card

An API Key should never be shared with anyone. Because then they can use your account and your saved credit.

If you accidentally "expose" your API key (text it to someone by accident or whatever), you can easily delete it and create a new one using the links listed above.

Answer quality: they're all pretty good, and it depends more on your prompt engineering

Speed: Claude is the fastest, as it allows 50 calls per minute, whereas OpenAI only allows 3 per minute and 200 per day (from the beginner tier). Gemini has a nice free tier for the "Flash-Light Preview" model with 15 calls per minute and 1000 per day.

Cost: OpenAI's gpt-4o-mini model is currently the cheapest.

Once you spend $5, then you can make 500 calls per minute. I don't know of any way to just automatically spend $5 to get to the next Tier.

• Definitions
• Example sentences
• Translations
• Usage tips

And please upvote it here: https://ankiweb.net/shared/info/643253121 , that helps other people discover it and encourages me to keep it maintained.

OpenAI: One flashcard uses 180 tokens, so 1 million tokens = 5500 cards = $0.15 USD

DeepSeek: One flashcard uses 195 tokens, so 1 million tokens = 5100 cards = $0.27 USD

Claude: One flashcard uses 660 tokens, so 1 million tokens = 1500 cards = $0.80 USD

So Claude is relatively more expensive, but it's the fastest. Once you are past the basic tier on OpenAI (once you spend $5), it becomes equivalently fast.

System Prompt:

You are an experienced German teacher who is helping me practice grammar.
You will be provided with a German word. Respond with:
-an "exampleSentence" at A2 or B1 level about 10-15 words long using the provided German word, and
-the "translation" of that sentence into English

User Prompt:

{de_word}

Output Mapping:

exampleSentence de_sentence
translation     en_sentence

• Change "de_sentence" and "en_sentence" in the dropdown boxes to whatever the Fields on your Cards are called.

System Prompt:

You are an Anki plugin that helps users create Cloze deletions. You will be provided with a sentence.
Choose 1-3 key words or phrases and replace them using Anki's Cloze deletion format: {{c1::word or phrase}}.
If there are multiple deletions, use c1, c2, c3, etc.
Ensure that deletions are meaningful and not too easy.

User Prompt:

{sentence}

Output Mapping:

cloze_sentence  formatted_cloze_sentence

• Change "formatted_cloze_sentence" in the dropdown box to the Field where you want to store the Cloze version.

System Prompt:

You are an expert at summarizing complex information.
You will be provided with a passage of text.
Summarize it in 1-2 sentences while preserving the core meaning.
Keep the language clear and concise.

User Prompt:

{field_text}

Output Mapping:

summary  summarized_text

• Change "summarized_text" in the dropdown box to the Field where you want to store the summary.

System Prompt:

You are a math and science tutor who explains concepts with step-by-step derivations.
You will be provided with a math or science problem.
Break it down into logical steps, explaining each step clearly.
Use LaTeX formatting for equations when necessary.

User Prompt:

{problem_statement}

Output Mapping:

derivation  step_by_step_solution

• Change "step_by_step_solution" in the dropdown box to the Field where you want to store the derivation.

System Prompt:

You are an expert language tutor helping students understand vocabulary in context.
You will be provided with:
- A target word or phrase
- An example sentence containing that word or phrase
- A definition of the word or phrase
- (Optional) A topic or category for additional context

Respond with:
- A revised version of the example sentence that sounds more natural and
  contextually appropriate.
- A brief explanation of the word or phrase in simple terms.
- A usage tip explaining when and how to use the word correctly.

User Prompt:

Word: {word}
Example Sentence: {example_sentence}
Definition: {definition}
Category (optional): {category}

Output Mapping:

refined_sentence  example_sentence
explanation       simple_explanation
usage_tip         usage_guidance

• Change "example_sentence," "simple_explanation," and "usage_guidance" in the dropdown boxes to match your Anki Card Fields.
• Note that this example would overwrite your current "example_sentence". This may or may not be desirable.