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Bugfix/LLM node issues for Claude Opus 4.5 and Claude Sonnet 4.5 #5587

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Bugfix/LLM node issues for Claude Opus 4.5 and Claude Sonnet 4.5 #5587

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c87949c
Fix LLM node issues for Claude Opus 4.5 and Claude Sonnet 4.5
tianwei-liu Dec 16, 2025
578cd92
Resolve comments
tianwei-liu Dec 16, 2025
25dacc0
use langchain anthropic
tianwei-liu Dec 19, 2025
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5 changes: 5 additions & 0 deletions packages/components/nodes/chatmodels/ChatAnthropic/ChatAnthropic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,11 @@ class ChatAnthropic_ChatModels implements INode {

const model = new ChatAnthropic(nodeData.id, obj)
model.setMultiModalOption(multiModalOption)
// Langchain sets topP to -1 by default, which is invalid for Claude Opus 4.5 and Claude Sonnet 4.5
if (model.topP === -1) {
model.topP = undefined
}

return model
}
}
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12 changes: 6 additions & 6 deletions packages/components/nodes/chatmodels/ChatAnthropic/ChatAnthropic_LlamaIndex.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import { ICommonObject, INode, INodeData, INodeOptionsValue, INodeParams } from '../../../src/Interface'
import { MODEL_TYPE, getModels } from '../../../src/modelLoader'
import { getBaseClasses, getCredentialData, getCredentialParam } from '../../../src/utils'
import { Anthropic } from 'llamaindex'
import { ChatAnthropic } from '@langchain/anthropic'

class ChatAnthropic_LlamaIndex_ChatModels implements INode {
label: string
Expand All @@ -24,7 +24,7 @@ class ChatAnthropic_LlamaIndex_ChatModels implements INode {
this.icon = 'Anthropic.svg'
this.category = 'Chat Models'
this.description = 'Wrapper around ChatAnthropic LLM specific for LlamaIndex'
this.baseClasses = [this.type, 'BaseChatModel_LlamaIndex', ...getBaseClasses(Anthropic)]
this.baseClasses = [this.type, 'BaseChatModel_LlamaIndex', ...getBaseClasses(ChatAnthropic)]
this.tags = ['LlamaIndex']
this.credential = {
label: 'Connect Credential',
Expand Down Expand Up @@ -76,23 +76,23 @@ class ChatAnthropic_LlamaIndex_ChatModels implements INode {

async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
const temperature = nodeData.inputs?.temperature as string
const modelName = nodeData.inputs?.modelName as 'claude-3-opus' | 'claude-3-sonnet' | 'claude-2.1' | 'claude-instant-1.2'
const modelName = nodeData.inputs?.modelName as string
const maxTokensToSample = nodeData.inputs?.maxTokensToSample as string
const topP = nodeData.inputs?.topP as string

const credentialData = await getCredentialData(nodeData.credential ?? '', options)
const anthropicApiKey = getCredentialParam('anthropicApiKey', credentialData, nodeData)

const obj: Partial<Anthropic> = {
const obj: Partial<ChatAnthropic> = {
temperature: parseFloat(temperature),
model: modelName,
apiKey: anthropicApiKey
anthropicApiKey: anthropicApiKey
}

if (maxTokensToSample) obj.maxTokens = parseInt(maxTokensToSample, 10)
if (topP) obj.topP = parseFloat(topP)

const model = new Anthropic(obj)
const model = new ChatAnthropic(obj)
return model
}
}
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