Prompt

LLM text generation from a prompt, with optional image/video/audio reference inputs, real-time streaming, and a built-in fan-out item list.

Overview

The Prompt node (llm-chat, labeled “Prompt” on the canvas; called “Generate Text” until September 2026) generates text from a prompt using a selectable LLM, with optional system instructions. It supports real-time token streaming and can reference upstream node outputs in its prompt via field mappings, making it a flexible text-generation and transformation step in any workflow.

It can also accept reference inputs on the multi-modal References handle (its own fuchsia pip) — an image, video, audio clip, or text — for multimodal prompting (e.g. “describe this image”, “summarize this clip”). Image/video/audio references are routed to the model as reference media (video and audio require a Gemini model — see Multimodal inputs); a text reference is merged into the prompt as added context.

This node is the result of merging the former AI Agent (image-prompt fan-out) and LLM Chat nodes into one. Existing AI Agent / LLM Chat nodes are auto-migrated to Prompt on workflow load. The legacy /v1/ai-writer/* routes remain available for back-compat; the node itself now runs on /v1/llm-chat/*.

Two outputs

Prompt exposes two outputs:

Output	Contents	Use it to
`text`	The full generated output as a single string, with any `===NEXT===` delimiters left intact	Feed a single block of text into Combine Text, a Preview node, a Save to Storage node, or a downstream Generate Text pass
`items`	The output split on `===NEXT===` into a fan-out list (each segment becomes one item, trimmed)	Feed into a Loop, a Generate Image node, or any list-aware consumer to fan out N× — one downstream run per item

When the prompt (or a template) produces a single block with no ===NEXT=== markers, items is a one-element list containing the whole output.

Configuration

Field	Type	Default	Description
Preset	`string`	`"custom"`	Built-in preset or one of your saved presets (see Presets). Sets the instructions and output format
Instructions (System Prompt)	`string`	`""`	Optional system instructions that guide the model’s behavior and output format. Labeled Instructions (System Prompt) in the config panel and Instructions on the node handle
User Input	`string`	`""`	The main prompt. Can include references to upstream nodes via field mappings
Model	`string`	`gemini-3.6-flash`	LLM model picked via the model selector — drives both capability and credit cost (see Credit pricing)
Temperature	`number`	`0.7`	Creativity control (0 = deterministic, 1 = more creative). Ignored by models that reject the parameter (Claude Opus 4.7, GPT-5.5, the GPT-5.6 family, GPT-6 Astra, Grok 4.6, Claude Sonnet 5, Claude Opus 4.8, Claude Opus 5, and Claude Fable 5)
Max Tokens	`number`	`8192`	Maximum output length in tokens. At `xhigh`/`max` effort — and at every effort, including `Auto`, for the models that reason by default (Claude Opus 5, Grok 4.6, GPT-6 Astra) — the effective cap is floored to 32768 so reasoning tokens can’t truncate the answer
# of runs	`number`	`1`	How many generations to produce per Run click (1–4 in the node’s quick toolbar). Each run is charged separately — the Run button shows the multiplied credit cost
Effort	`string`	`Auto`	Reasoning effort for models that support it — hidden entirely for models with no reasoning levels. See Reasoning effort
Advanced mode	`boolean`	`false`	Gemini models only. Runs the model on the provider’s own API so Temperature, Max Tokens and the full reasoning-depth range actually apply — those controls appear once it is on. Bills one credit tier up; the node’s cost badge updates immediately. Disabled with an inline reason on non-Gemini models
`promptPrefix` / `promptSuffix`	text	–	Optional pre/post text wrapped around the User Input (never the Instructions / system prompt) at run time (settings panel → Pre & post text; hidden from app users; captured by presets). See Prompt pre & post text.

Model selector

The model is chosen from the shared LLM model selector — a searchable picker grouped by provider (Anthropic / Google / OpenAI / xAI), with each group ordered economy → premium. The selected model determines the credit cost by tier. Every model accepts an image reference; the table below shows which Gemini models additionally accept video and audio references.

Model	Tier	Multimodal (references)
Gemini 3 Flash	Economy	image + video + audio
Gemini 3.6 Flash	Economy	image + video + audio
Gemini 3.7 Flash	Economy	image only
Gemini 3.8 Flash	Economy	image only
Claude Haiku 4.5	Economy	image only
GPT-5.6 Luna	Economy	image only
Claude Sonnet 4.6	Standard	image only
GPT-5.2	Standard	image only
GPT-5.6 Terra	Standard	image only
Grok 4.6	Standard	image only
Claude Sonnet 5	Standard	image only
Gemini 3.1 Pro	Premium	image + video + audio
Claude Opus 4.7	Premium	image only
GPT-5.4	Premium	image only
GPT-5.5	Premium	image only
GPT-5.6 Sol	Premium	image only
GPT-6 Astra	Premium	image only
Claude Opus 4.8	Premium	image only
Claude Opus 5	Premium	image only
Claude Fable 5	Premium	image only

The default model is Gemini 3.6 Flash (economy tier). Most models expose reasoning levels and show an Effort selector next to the model picker (the exceptions: Gemini 3 Flash, Claude Haiku 4.5, GPT-5.2, and Gemini 3.1 Pro have no effort lever — though the two Gemini models gain one under Advanced mode, which reaches the provider’s fuller range) — see Reasoning effort.

Gemini 3.7 Flash and Gemini 3.8 Flash currently accept image references only — video/audio references for them are not yet enabled (use Gemini 3.6 Flash or Gemini 3.1 Pro for those).

Canvas controls

Hovering the node on the canvas reveals a quick toolbar beneath it, mirroring the Generate Image node:

AI Model — pick the LLM (same options as the config panel’s model selector).
Effort — reasoning effort for models that support it; hidden when the selected model has no reasoning levels. See Reasoning effort.
Preset — choose a built-in preset or one of your saved presets.
# of runs — generate 1–4 results per click; the Run button’s credit cost updates to reflect the multiplier.
Run — execute the node.

The result card has a top action strip: a view toggle, Copy, Download, and Log on the left; a Show outputs toggle and a delete (✕) on the right. The view toggle switches the output between raw text and a rendered view — a colored JSON object view when the output parses as JSON (the icon becomes { }), otherwise rendered Markdown (eye icon). Pressing Show outputs (shown only when there is more than one result) reveals a results browser that floats above the node: numbered tiles with prev/next paging, arrow-key navigation when the node is selected, an active-result ring, and a hover delete affordance. The card shows the currently selected result and, just under the action strip, the model and preset that produced it. The Log button opens the full execution log grouped by run (each run is labeled with its model and preset). The output text scrolls inside the card with the same scrollbar as the Text Prompt node.

Drag the magnifier handle at the bottom-left corner to zoom the node up to 2× for easier reading; the bottom-right corner resizes it (hold Alt to swap corners).

Inputs & Outputs

Inputs:
- prompt — text/picker producers, injected into the User Input.
- references — multi-modal (own fuchsia pip): image, video, audio, or text. Media becomes a reference attachment; text is merged into the prompt as added context.
- system-prompt — text producers, used as the system instructions.
Outputs:
- text — the full generated string (delimiters intact)
- items — the ===NEXT===-split fan-out list

Multimodal inputs

Image reference — supported by every model. Useful for “describe this image”, “write a caption”, or generating prompts from a connected image.
Video / audio reference — supported only by the video-capable Gemini models (Gemini 3 Flash, Gemini 3.6 Flash, or Gemini 3.1 Pro — Gemini 3.7 Flash and Gemini 3.8 Flash are image-only for now). If a video or audio reference is connected, select one of those models or the reference is ignored.

Presets

Presets set the instructions (system prompt) and output format. There are two kinds:

Built-in presets:

Preset	Purpose	Requires reference image
Custom	Free-form — use your own Instructions and User Input	No
Photo Shoot Planner	Generate N image prompts for a photo-shoot series	Yes
Product Catalog Writer	Generate N product-shot image prompts	Yes
Storyboard Writer	Generate N storyboard-shot image prompts	Yes

The Photo Shoot Planner / Product Catalog Writer / Storyboard Writer presets are image-prompt fan-out templates: they emit multiple prompts separated by ===NEXT=== (ready for the items output). When one of these templates is selected, the config panel shows an amber warning if no reference image is connected, and running the node is blocked (“No reference image connected”) until you wire one in. The Custom template has no reference-image requirement.

Built-in fan-out templates use an {outputCount} placeholder that is replaced at runtime with the requested number of items.

User-defined presets:

Use “Save as preset” to store your current Instructions + settings as a reusable preset. When one of your saved presets is selected, two extra controls appear next to the dropdown:

Update — overwrite the selected preset in place with your current Instructions + settings (keeps the same name).
Delete (🗑) — remove the selected preset (asks for confirmation, then falls back to the Custom preset).

User presets are also managed in Settings and appear in the Preset dropdown alongside the built-in presets.

Fan-out

Prompt is built for fan-out — turning one generation into N downstream operations:

items output (composable) — split on ===NEXT=== and feed into a Loop or a Generate Image node to run N× automatically as part of a workflow.
“Create N Image Nodes” — a canvas action that spawns one Generate Image node per generated item, laid out in a grid and pre-wired with edges, each pre-filled with its prompt.
“Generate All” — runs all the spawned Generate Image nodes (with a concurrency limit).

The composable items output is the recommended path for automated workflows; the canvas actions are for interactive editing on the canvas.

Credit pricing

Cost depends on the selected model’s tier.

Tier	Example models	Credits
Economy	Gemini Flash, Claude Haiku	1
Standard	Claude Sonnet, GPT-5.2, Grok 4.6	2
Premium	Claude Opus, Claude Fable 5, GPT-5.4, GPT-6 Astra, Gemini Pro	3

The credit identifier is llm-chat (standard), llm-chat:economy, or llm-chat:premium, built from the selected model at request time. These match the runtime STATIC_CREDIT_COSTS values (llm-chat = 2, llm-chat:economy = 1, llm-chat:premium = 3).

Reasoning effort

Reasoning-capable models expose an Effort selector (Auto/low/…/max — the levels vary per model). Auto applies the vendor default. xhigh and max bill one tier up: economy models bill the standard price, standard models bill the premium price, premium models are unchanged.

Examples (LLM Chat: 1 cr economy / 2 cr standard / 3 cr premium):

GPT-5.6 Luna at max → 2 credits (economy billed as standard)
GPT-5.6 Terra at xhigh → 3 credits (standard billed as premium)
Grok 4.6 at xhigh → 3 credits (standard billed as premium; its ladder is low/medium/high/xhigh)
GPT-5.6 Sol at max → 3 credits (premium, unchanged)
GPT-6 Astra at xhigh → 3 credits (premium, unchanged; its ladder is low/medium/high/xhigh)
Claude Sonnet 5 at high → 2 credits (high never changes the price)
Gemini 3.6 Flash, Gemini 3.7 Flash, and Gemini 3.8 Flash expose low/high only — none of them changes the price (requests above high clamp down to it)

Best Practices

Use the Instructions (System Prompt) to define output format, tone, and constraints — good instructions dramatically improve consistency.
Reference upstream nodes in the User Input via field mappings for dynamic, context-aware prompts.
Keep Temperature at 0.7 for a balance of creativity and coherence. Lower it for factual or structured output; raise it for brainstorming.
For long-form content, raise Max Tokens. The default (8192) handles most cases but may truncate very long outputs. At xhigh/max effort the cap is automatically floored to 32768 — and so it is at every effort, including Auto, on the models that reason by default (Claude Opus 5, Grok 4.6, GPT-6 Astra), whose reasoning tokens share the output budget on every call.
For image-prompt fan-out (Photo Shoot Planner / Product Catalog Writer / Storyboard Writer), connect a reference image upstream — running these templates is blocked without one. The Custom template does not require one.
Pick the cheapest model that meets your quality bar — economy (1 cr) is plenty for rewriting and captioning; reserve premium (3 cr) for complex reasoning.
To process a video or audio reference, select a video-capable Gemini model (see the model table — Gemini 3.7 Flash and Gemini 3.8 Flash are image-only for now).

Common Use Cases

Rewriting or transforming upstream text (more concise, different tone)
Generating social-media captions from a video description
Creating image prompts from a high-level concept (especially with the fan-out templates)
Brainstorming variations from a seed concept, then fanning out via the items output
Describing or summarizing a connected image, video, or audio clip (multimodal)
Building structured data (JSON, lists, tables) from natural-language input

Tips

Streaming is active by default — tokens appear in real time as the model generates them, with a blinking cursor and a stop button during generation.
The ===NEXT=== delimiter is the fan-out boundary: the text output keeps it; the items output splits on it.
Field mappings inject upstream node outputs into the prompt. For example, connect a Text Prompt node and reference its output in the User Input.
The node uses the SSE streaming endpoint /v1/llm-chat/generate-stream, which bypasses the Vite proxy for real-time delivery. Both the config panel and the DAG executor use the same streaming path. (The legacy /v1/ai-writer/generate-stream endpoint remains for back-compat.)