@langchain/anthropic Sends topP for sonnet-4.5 and fails

[nicogon]

Newest model of Anthropic claude-sonnet-4.5 fails to generate an inference with error

Retrying Claude API: 0 400 {"type":"error","error":{"type":"invalid_request_error","message":"`top_p` cannot be set to -1 for this model."},"request_id":"XXX"} {"status":400,"headers":{},"requestID":"XXXXX","error":{"type":"error","error":{"type":"invalid_request_error","message":"`top_p` cannot be set to -1 for this model."},"request_id":"XXXXX"},"attemptNumber":1,"retriesLeft":0,"stack":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"`top_p` cannot be set to -1 for this model.\"},

Even if we don't set topp

    const model = new ChatAnthropic({
      maxRetries: 0,
      temperature: 1,
      model: model,
      apiKey,
      maxTokens,
    });

Error Message and Stack Trace (if applicable)

Retrying Claude API: 0 400 {"type":"error","error":{"type":"invalid_request_error","message":"top_p cannot be set to -1 for this model."},"request_id":"XXX"} {"status":400,"headers":{},"requestID":"XXXXX","error":{"type":"error","error":{"type":"invalid_request_error","message":"top_p cannot be set to -1 for this model."},"request_id":"XXXXX"},"attemptNumber":1,"retriesLeft":0,"stack":"Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"top_p cannot be set to -1 for this model."},

Description

Newest model of Anthropic claude-sonnet-4.5 fails to generate an inference due langchain setting topP even if its not defined.

System Info

node version v18.20.2
"@langchain/anthropic": "^0.3.28",
"@langchain/core": "^0.3.43",

[hntrl]

Thanks for flagging! Fixed in #9065 and released in @langchain/anthropic@0.3.29

[pavlo-tkhir]

@hntrl

I still get the error when the thinking is enabled:

const agentModel = new ChatAnthropic({
  modelName: "claude-sonnet-4-5",
  maxTokens: 32_000,
  thinking: { type: "enabled", budget_tokens: 1024 },
});

{
      "type": "Error",
      "message": "topP is not supported when thinking is enabled",
      "stack":
          Error: topP is not supported when thinking is enabled
              at ChatAnthropic.invocationParams
...

"@langchain/anthropic": "^0.3.29"

[hntrl]

@pavlo-tkhir Released in @langchain/anthropic@0.3.30!