remove default temp

[filip-michalsky]

why

Stagehand v3 was setting hard-coded temperature defaults for standard act, extract, and observe inference calls. This forced provider
behavior instead of letting model/provider defaults apply.

what changed

Removed the hard-coded temperature: isGPT5 ? 1 : 0.1 defaults from shared act, extract, and observe inference.

Removed the unused GPT-5 temperature branching in that path.

Updated Groq and Cerebras clients to pass through options.temperature directly instead of defaulting missing values to 0.7, while preserving
explicit temperature: 0.

Added regression tests covering:

• act, extract, and observe no longer pass temperature by default
• Groq/Cerebras do not inject default temperature
• Groq/Cerebras preserve explicit zero temperature

test plan

• pnpm --filter @browserbasehq/stagehand run typecheck
• pnpm --filter @browserbasehq/stagehand exec prettier --check lib/inference.ts lib/v3/llm/GroqClient.ts lib/v3/llm/CerebrasClient.ts tests/
  unit/inference-temperature.test.ts tests/unit/openai-compatible-temperature.test.ts
• pnpm --filter @browserbasehq/stagehand run build:esm
• pnpm --filter @browserbasehq/stagehand run test:core -- packages/core/dist/esm/tests/unit/inference-temperature.test.js packages/core/
  dist/esm/tests/unit/openai-compatible-temperature.test.js packages/core/dist/esm/tests/unit/aisdk-clients.test.js packages/core/dist/esm/
  tests/unit/anthropic-cua-adaptive-thinking.test.js

[changeset-bot]

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Latest commit: 7d62aa1

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[cubic-dev-ai]

No issues found across 5 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant User as Caller / SDK User
    participant Inf as Inference Logic (act/extract/observe)
    participant Client as LLMClient (Base Interface)
    participant Provider as Groq/Cerebras Client
    participant API as External LLM Provider

    Note over User,Inf: Request starts (e.g. stagehand.act)

    User->>Inf: call(instruction, options)
    
    Inf->>Inf: Build System/User Prompts
    
    Note over Inf: CHANGED: Removed default temperature logic<br/>(Previously forced 0.1 or 1.0 for GPT-5)

    Inf->>Client: createChatCompletion(request)
    
    Client->>Provider: createChatCompletion(request)

    alt NEW: Explicit Temperature Provided
        Provider->>Provider: Map temperature from options
    else NEW: Temperature is Undefined
        Note over Provider: CHANGED: No longer defaults to 0.7<br/>Allows Provider API to use its own default
        Provider->>Provider: temperature = undefined
    end

    Provider->>API: POST /chat/completions (JSON Payload)
    Note right of API: Payload includes temperature ONLY if provided

    API-->>Provider: ChatCompletion Response
    Provider-->>Inf: Structured Data / Action
    Inf-->>User: Final Result

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