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AI / Google Antigravity Gemini Fundamentals Interview Questions

What is the Interactions API and how does it differ from generateContent?

The Interactions API is Google's new recommended interface for building with Gemini models and agents, generally available as of June 2026. The original generateContent API remains fully supported but is now considered legacy for new projects.

Interactions API vs generateContent
FeaturegenerateContentInteractions API
StatusLegacy (still fully supported)Recommended for all new projects
State managementManual - send full history every turnOptional server-side via previous_interaction_id
Execution visibilitySingle response objectObservable execution steps for debugging/UI
Background tasksNot supportedbackground=true for long-running tasks
Caching efficiencyStandardHigher cache hit rates via server-side state
Agent supportLimitedBuilt for managed agents and agentic workflows
Thinking stepsHiddenExposed as observable steps
from google import genai
client = genai.Client()

# Interactions API - new recommended approach
interaction = client.interactions.create(
    model="gemini-3.5-flash",
    input="I have 2 dogs in my house.",
)
print(interaction.output_text)

# Chain turns with previous_interaction_id (server manages state)
follow_up = client.interactions.create(
    model="gemini-3.5-flash",
    input="How many paws are in my house?",
    previous_interaction_id=interaction.id,
)
print(follow_up.output_text)  # Gemini knows context from turn 1

# Legacy generateContent (still works, not deprecated)
response = client.models.generate_content(
    model="gemini-3.5-flash",
    contents="I have 2 dogs in my house.",
)

What parameter in the Interactions API enables server-side conversation state management?
What key new capability does background=true in the Interactions API enable?

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More Related questions...

What is the Gemini API and what does it give developers access to? What is the Interactions API and how does it differ from generateContent? What are the current Gemini model families and which should you use for different tasks? What is Gemini 3.5 Flash and what makes it the current flagship model? What are model version types in the Gemini API and which should you use in production? What is the Antigravity agent and what can it do? What are Managed Agents in the Gemini API and how do they differ from building agents yourself? What is Search Grounding and why is it important for Gemini applications? What are the Gemini API's multimodal input capabilities? What is the Gemini context window and how do you manage long contexts? How does thinking/reasoning work in Gemini models and what is thinking_level? What is structured output (JSON mode) in the Gemini API and how do you implement it? How does function calling (tool use) work in the Gemini API? What is the Gemini Files API and when do you need it? What is the Gemini Live API and what real-time capabilities does it enable? What are the Nano Banana image generation models and how do they replace Imagen? What is Veo and what video generation capabilities does the Gemini API offer? What are the Gemini API rate limits and how do they differ between free and paid tiers? What is the Gemini Batch API and when should you use it? How do you use Python and JavaScript SDKs with the Gemini API? What is context caching in the Gemini API and how does it reduce costs? What is the Gemini API pricing model and how do you estimate costs? What is Google AI Studio and how does it differ from Vertex AI for Gemini access? What are Gemma models and how do they relate to the Gemini API? How do you implement streaming responses in the Gemini API? What is the Python `import antigravity` Easter egg and what does it demonstrate? What is the Gemini API's approach to safety and content moderation? What is Gemini Deep Research and how does it work as a managed agent? What is Firebase AI Logic and how does it simplify Gemini integration in mobile and web apps? How do you implement multi-turn conversations in the Gemini API? What is the Gemini API's text-to-speech capability and how do you use it? What are Gemini API embeddings and what models support them? What is the Gemini API's system instruction and how does it differ from a user prompt? What is the observable execution steps feature in the Gemini Interactions API? How do you handle Gemini API errors and implement robust error handling? What is Gemini's native audio understanding capability and how do you use it? What is the Gemini API's grounded generation with Google Search and how does attribution work? What are the key deprecated and shut-down Gemini models developers should know about? How do you build a Retrieval-Augmented Generation (RAG) pipeline with the Gemini API? What are best practices for building production-grade Gemini API applications?
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