> ## Documentation Index > Fetch the complete documentation index at: https://docs.comfy.org/llms.txt > Use this file to discover all available pages before exploring further. # ClaudeNode - ComfyUI Built-in Node Documentation > Generate text responses from Anthropic's Claude models. Generate text responses from Anthropic's Claude models. Provide a text prompt and optionally one or more images for multimodal context, and the node returns the model's generated text response. ## Inputs Inputs are grouped into common settings, model-specific settings that appear when a model is selected, and optional reference images. ### Common Inputs | Parameter | Description | Data Type | Required | Range | | - | - | - | - | - | | `model` | The Claude model used to generate the response. Selecting a model reveals model-specific settings below. | DYNAMIC\_COMBO | Yes | `"Opus 5.5"`
`"Opus 5"`
`"Opus 4.8"`
`"Fable 5.1"`
`"Fable 5"`
`"Sonnet 5.5"`
`"Sonnet 5"`
`"Opus 4.7"`
`"Opus 4.6"`
`"Sonnet 4.6"`
`"Sonnet 4.5"`
`"Haiku 4.5"` | | `prompt` | Text input to the model. (default: empty string) | STRING | Yes | N/A | | `seed` | Seed controls whether the node should re-run; results are non-deterministic regardless of seed. (default: 0) | INT | Yes | 0 to 2147483647 | | `system_prompt` | Foundational instructions that dictate the model's behavior. (default: empty string) | STRING | No | N/A | ### Opus 5.5, Opus 5, Fable 5.1, and Fable 5 Inputs These four models share the same settings. They do not expose a temperature setting, and reasoning is always enabled. | Parameter | Description | Data Type | Required | Range | | - | - | - | - | - | | `max_tokens` | Maximum number of tokens to generate (includes reasoning tokens when enabled). (default: 32768) | INT | Yes | 1024 to 64000 (Opus 5.5)
4096 to 64000 (Opus 5, Fable 5.1, Fable 5) | | `reasoning_effort` | Extended thinking effort. Reasoning is always enabled for this model. (default: "high") | COMBO | Yes | `"low"`
`"medium"`
`"high"`
`"xhigh"`
`"max"` | ### Opus 4.8, Sonnet 5.5, and Sonnet 5 Inputs These three models share the same settings. They do not expose a temperature setting. | Parameter | Description | Data Type | Required | Range | | - | - | - | - | - | | `max_tokens` | Maximum number of tokens to generate (includes reasoning tokens when enabled). (default: 32768) | INT | Yes | 1024 to 64000 (Sonnet 5.5)
4096 to 64000 (Opus 4.8, Sonnet 5) | | `reasoning_effort` | Extended thinking effort. `"off"` disables reasoning. (default: "off") | COMBO | Yes | `"off"`
`"low"`
`"medium"`
`"high"`
`"xhigh"`
`"max"` | ### Opus 4.7, Opus 4.6, Sonnet 4.6, and Sonnet 4.5 Inputs These four models share the same settings. | Parameter | Description | Data Type | Required | Range | | - | - | - | - | - | | `max_tokens` | Maximum number of tokens to generate (includes reasoning tokens when enabled). (default: 32768) | INT | Yes | 4096 to 64000 | | `temperature` | Controls randomness. 0.0 is deterministic, 1.0 is most random. Ignored for Opus 4.7 and any model when `reasoning_effort` is set. (default: 1.0) | FLOAT | Yes | 0.0 to 1.0 (step: 0.01) | | `reasoning_effort` | Extended thinking effort. `"off"` disables reasoning. (default: "off") | COMBO | Yes | `"off"`
`"low"`
`"medium"`
`"high"` | `reasoning_effort` offers `"off"`, `"low"`, `"medium"`, and `"high"` on all four models. Opus 4.7, Opus 4.6, and Sonnet 4.6 additionally accept `"max"`, and Opus 4.7 also accepts `"xhigh"`. ### Haiku 4.5 Inputs This model does not expose a `reasoning_effort` setting. | Parameter | Description | Data Type | Required | Range | | - | - | - | - | - | | `max_tokens` | Maximum number of tokens to generate (includes reasoning tokens when enabled). (default: 32768) | INT | Yes | 4096 to 64000 | | `temperature` | Controls randomness. 0.0 is deterministic, 1.0 is most random. Ignored for Opus 4.7 and any model when `reasoning_effort` is set. (default: 1.0) | FLOAT | Yes | 0.0 to 1.0 (step: 0.01) | ### Reference Inputs | Parameter | Description | Data Type | Required | Range | | - | - | - | - | - | | `images` | Optional image(s) to use as context for the model. Up to 20 images. Growable slot: connect 1 to 20 items (`image_1` ... `image_20`). | IMAGE | No | 0 to 20 images | ### Parameter Constraints * **Image limit:** A maximum of 20 images can be provided per request. Connecting more than 20 images raises an error. * **Prompt required:** The prompt must contain at least one non-whitespace character. An empty prompt raises a validation error. * **Temperature handling:** When thinking is enabled, the Anthropic API requires temperature to be unset (it defaults to 1.0). Opus 5.5, Opus 5, Opus 4.8, Fable 5.1, Fable 5, Sonnet 5.5, and Sonnet 5 do not expose a temperature setting. Opus 4.7 ignores `temperature`, and any model with `reasoning_effort` set to anything other than `"off"` also ignores it. * **Reasoning/thinking behavior:** The `reasoning_effort` setting controls whether thinking is enabled. Opus 5.5, Opus 5, Fable 5.1, and Fable 5 always have reasoning enabled. Haiku 4.5 does not support reasoning. When thinking is enabled, the node uses the appropriate thinking mode for the selected model, either adaptive or budget-based. In budget mode, the reasoning token budget is capped to leave at least 1024 tokens for the actual response. When `reasoning_effort` is `"off"` on Sonnet 5.5, the request uses `between_tools` thinking instead of disabled thinking, so the response still contains no reasoning. * **Max tokens minimum:** `max_tokens` accepts values from 1024 on Opus 5.5 and Sonnet 5.5, and from 4096 on every other model. * **Safety refusal:** If Claude declines to answer the request for safety reasons, the node raises an error asking you to rephrase the prompt or try a different model. * **Output text:** Thinking and reasoning blocks are not included in the output; only generated text is returned. ## Outputs | Output Name | Description | Data Type | | - | - | - | | `output` | The generated text response from the Claude model. Thinking/reasoning blocks are not included. If no text is generated, returns "Empty response from Claude model." | STRING | > This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/ClaudeNode/en.md) *** **Source fingerprint (SHA-256):** `35b737da0f4c3a9da72910bf2053b18ae6a5c60989dc9607b61037623bc94e38` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.