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Merged
merged 5 commits into from
Nov 19, 2025
Merged

feat: adding gpt 5.1 to stagehand #1264

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56aae47
feat: adding gpt 5.1 to stagehand
Kylejeong2 Nov 13, 2025
69ab3c4
remove model from llmprovider
Kylejeong2 Nov 13, 2025
072bcaf
Update packages/core/lib/v3/types/public/model.ts
Kylejeong2 Nov 14, 2025
fddf269
Update packages/evals/taskConfig.ts
miguelg719 Nov 19, 2025
b0b1087
changesets
Kylejeong2 Nov 19, 2025
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5 changes: 5 additions & 0 deletions .changeset/bright-meals-add.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@browserbasehq/stagehand": patch
---

feat: adding gpt 5.1 to stagehand
3 changes: 2 additions & 1 deletion packages/core/lib/v3/llm/aisdk.ts
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Expand Up @@ -127,6 +127,7 @@ export class AISdkClient extends LLMClient {

let objectResponse: Awaited<ReturnType<typeof generateObject>>;
const isGPT5 = this.model.modelId.includes("gpt-5");
const isGPT51 = this.model.modelId.includes("gpt-5.1");
if (options.response_model) {
try {
objectResponse = await generateObject({
Expand All @@ -138,7 +139,7 @@ export class AISdkClient extends LLMClient {
? {
openai: {
textVerbosity: "low", // Making these the default for gpt-5 for now
reasoningEffort: "minimal",
reasoningEffort: isGPT51 ? "low" : "minimal",
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@miguelg719 miguelg719 Nov 13, 2025

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any reason to make 5.1 low vs 5 minimal? is it faster?

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@Kylejeong2 Kylejeong2 Nov 13, 2025

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its a weird syntax change, you have to set to low because the model doesn't accept minimal as a param

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@Kylejeong2 Kylejeong2 Nov 18, 2025

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@miguelg719

can also apparently set the reasoning to none

https://platform.openai.com/docs/guides/latest-model

},
}
: undefined,
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3 changes: 2 additions & 1 deletion packages/evals/lib/AISdkClientWrapped.ts
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Expand Up @@ -133,6 +133,7 @@ export class AISdkClientWrapped extends LLMClient {

let objectResponse: Awaited<ReturnType<typeof generateObject>>;
const isGPT5 = this.model.modelId.includes("gpt-5");
const isGPT51 = this.model.modelId.includes("gpt-5.1");
if (options.response_model) {
try {
objectResponse = await generateObject({
Expand All @@ -144,7 +145,7 @@ export class AISdkClientWrapped extends LLMClient {
? {
openai: {
textVerbosity: "low", // Making these the default for gpt-5 for now
reasoningEffort: "minimal",
reasoningEffort: isGPT51 ? "low" : "minimal",
},
}
: undefined,
Expand Down