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[fix] stagehand.agent isn't using the correct model defaults #1213

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[fix] stagehand.agent isn't using the correct model defaults #1213

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So when I ran stagehand.agent out of the box, I kept getting the mode…
bennycortese Oct 31, 2025
e6f6d86
Changeset added
bennycortese Oct 31, 2025
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5 changes: 5 additions & 0 deletions .changeset/whole-goats-clap.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@browserbasehq/stagehand": minor
---

Default model providers don't seem to be working correctly in Stagehand V3 when a model isn't specified - this diff should fix that and fix the associated logging
16 changes: 13 additions & 3 deletions packages/core/lib/v3/v3.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1371,7 +1371,7 @@ export class V3 {
? typeof options?.model === "string"
? { value: options.model, type: "string" }
: { value: options.model.modelName, type: "string" }
: { value: this.llmClient.modelName, type: "string" },
: { value: this.modelName, type: "string" },
systemPrompt: { value: options?.systemPrompt ?? "", type: "string" },
tools: { value: JSON.stringify(options?.tools ?? {}), type: "object" },
...(options?.integrations && {
Expand Down Expand Up @@ -1473,8 +1473,13 @@ export class V3 {
try {
if (this.apiClient && !this.experimental) {
const page = await this.ctx!.awaitActivePage();
// Ensure model is set for API calls - use the resolved modelName
const agentConfigWithModel: AgentConfig = {
...options,
model: options?.model || modelName,
};
result = await this.apiClient.agentExecute(
options,
agentConfigWithModel,
resolvedOptions,
page.mainFrameId(),
);
Expand Down Expand Up @@ -1576,8 +1581,13 @@ export class V3 {
try {
if (this.apiClient && !this.experimental) {
const page = await this.ctx!.awaitActivePage();
// Ensure model is set for API calls - default to V3's modelName if not specified
const agentConfigWithModel: AgentConfig = {
...options,
model: options?.model || this.modelName,
};
result = await this.apiClient.agentExecute(
options,
agentConfigWithModel,
resolvedOptions,
page.mainFrameId(),
);
Expand Down