Add Send cURL To Claude Text Completion API as an LLM TIL

llm/send-curl-to-claude-text-completion-api.md

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+# Send cURL To Claude Text Completion API
+
+Here is how we can make a `cURL` (`POST`) request to the Claude text completion
+API. It requires already having a Claude API account with (paid) credits. At
+this time, you can get $5 in free credits to try it out.
+
+Assuming all that, we can grab an API key, store it somewhere safe and
+accessible like 1Password, and then start formatting a request.
+
+We need to specify a couple headers as well as `POST` body parameters.
+
+```bash
+curl -X POST \
+  -H "Content-Type: application/json" \
+  -H "x-api-key: $(op item get "Anthropic Claude API Key" --field credential)" \
+  -H "anthropic-version: 2023-06-01" \
+  -d \
+'{
+  "model": "claude-2.1",
+  "max_tokens_to_sample": 1024,
+  "prompt": "Human: Show me an example of a simple Ruby program.\n\nAssistant:"
+}' \
+  https://api.anthropic.com/v1/complete
+```
+
+The required headers are:
+- `"Content-Type: application/json"`
+- `x-api-key` with our API key
+- `"anthropic-version: 2023-06-01"` (the latest Anthropic API version)
+
+Then, in the body, we specify:
+- the `model` (e.g. `claude-2.1`)
+- the max number of tokens you want the model to use
+- a prompt that starts with `Human:` and then prompts the `Assistant:`
+
+Note: this is a legacy API and the [Messages
+API](https://docs.anthropic.com/claude/reference/messages_post) should be
+preferred.
+
+[source](https://docs.anthropic.com/claude/reference/complete_post)