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PublishedOctober 21, 2026 at 11:16 PM

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version: "1.0.1" name: llm description: Call LLM via CLI for transcription, vision, speech/image generation, piping prompts, sub-agents, ...

bash

llm --help
llm '2 + 2 = ?'
cat prompt.txt | llm
llm --fragment a.txt --fragment https://example.org/ --fragment "User prompt fragment" --system-fragment system-prompt.txt
llm --system 'Speak German' 'Hi'
llm models list
llm --model gpt-5-nano 'Hi'
llm --query 5-nano 'Hi' # pick first model matching query
llm --attachment audio.opus --model gemini-3-flash-preview 'Transcribe audio'
llm -a a.png -a b.png -s "OCR images"
llm --schema "{... JSON schema ...}" '...'  # use JSON schema
llm --usage 'Hi'  # show token usage
cat image.jpg | llm 'describe' --attachment -  # describe image
llm --option reasoning_effort minimal 'Hi'
llm --extract 'List files by size'  # extract first code block
llm cmd 'List files by size'  # extract and run first code block
llm embed -c 'Hi' -m 3-small -f base64  # get embedding as base64 (or json) using text-embedding-3-small

Docs: https://llm.datasette.io/en/stable/usage.html

Preferred models:

gpt-5.4-mini: default gpt-5.4-nano: cheapest gemini-2.5-flash: cheap transcription gemini-3.7-flash: best for transcription

Generate speech:

bash

curl https://api.openai.com/v1/audio/speech -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
  -d '{"model": "tts-1", "input": "Hello", "voice": "alloy", "response_format": "mp3"}' --output hello.mp3

voice: alloy, ash, ballad, coral, echo, fable, onyx, nova, sage, shimmer, and verse response_format: mp3, opus, wav Add "instructions": with style / tone

Generate images:

bash

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent?key=$GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contents": [{"parts": [{"text": "Cat"}]}], "generationConfig": {"responseModalities": ["IMAGE"], "imageConfig": {"aspectRatio": "16:9"}}}' \
  | jq -r '.candidates[0].content.parts[0].inlineData.data' | base64 -d > cat.png

aspectRatio: "1:1", "4:3", "16:9", "3:4", "9:16", "3:2", "2:3", "5:4", "4:5", "21:9" Specify style, layout, font, scene, lighting, ... clearly

Edit images / provide reference images:

bash

IMG=$(base64 -w0 cat.png)
echo '{"contents": [{"parts": [{"text": "Edit image: add bold caption `CAT`"}, {"inlineData": {"mime_type": "image/png", "data": "'"$IMG"'"}}]}], "generationConfig": {"responseModalities": ["IMAGE"]}}' > payload.json
curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent?key=$GEMINI_API_KEY" \
  -H "Content-Type: application/json" -d @payload.json \
  | jq -r '.candidates[0].content.parts[0].inlineData.data' | base64 -d > captioned.png

To write/run tasks as a sub-agent (e.g., code review, code generation), use either Codex or Claude Code:

bash

codex exec 'Review uncommitted changes for errors and style'
codex exec --image screenshot.png 'Compare code with UI and suggest improvements'
npx -y @anthropic-ai/claude-code -p 'Write a web app ...'

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