One of the first questions developers run into with Antigravity IDE is: which model should I use, and when? Gemini 2.5 Pro is powerful, but burning Pro credits on every autocomplete suggestion or simple question quickly drains your budget. Gemini 2.5 Flash, on the other hand, can handle the majority of your daily development tasks at remarkable speed and significantly lower cost — if you know how to use it well.
In this guide, I'll share the Flash-first workflow I've refined across several app development projects, along with a clear framework for deciding when to reach for Pro instead.
Why Gemini 2.5 Flash Works Well for Antigravity Development
Google designed Gemini 2.5 Flash around a specific goal: high speed, low cost, and "good enough" accuracy for most real-world tasks. Inside Antigravity IDE, Flash shines in the following scenarios:
- Code explanations and comment generation: Flash handles large context reads and summarization quickly
- Bug identification and fix suggestions: Fast responses to error messages and stack traces
- Boilerplate generation: CRUD scaffolding, type definitions, repeated patterns
- Refactoring suggestions: Reading existing code and proposing improvements
- Unit test scaffolding: Writing test stubs and basic test cases
The key difference from Gemini 2.5 Pro is reasoning depth. Pro excels at complex architectural decisions and multi-file refactors spanning hundreds of lines. But roughly 80% of daily coding tasks don't need that depth — and Flash delivers those results faster than Pro.
How to Switch Models in Antigravity
Switching models in Antigravity is straightforward: use the model selector dropdown in the top-right corner of the chat panel. You can change models at any point in a session, which makes it easy to adapt as tasks shift in complexity.
# Basic model switching steps
1. Open the Antigravity chat panel
2. Click the model selector in the top-right
3. Select "Gemini 2.5 Flash"
4. Proceed with your prompts as usual
# Setting a default model in AGENTS.md
# Add to .antigravity/AGENTS.md in your project root:
model: gemini-2.5-flash # Use Flash as the project default
Practical tip: Get into the habit of checking the model selector when you open Antigravity. Setting Flash as your starting point before a session prevents accidental Pro consumption on routine tasks. I now switch to Flash before writing my first prompt — it's a small habit with a noticeable impact on monthly credit usage.
Flash vs Pro: A Clear Decision Framework
Rather than guessing, here's how I decide which model to reach for:
Use Gemini 2.5 Flash for:
- Adding JSDoc or inline comments to functions
- Understanding what an error message means
- Renaming variables or extracting a function
- Adding TypeScript types to existing code
- Writing a single test case
- Parsing logs and stack traces
- Generating standard CRUD operations
Switch to Gemini 2.5 Pro for:
- Designing the architecture of a new feature from scratch
- Multi-file refactors with complex dependencies
- Technical decision-making and stack selection discussions
- Bugs where root cause identification is genuinely unclear
- Full codebase reviews requiring holistic understanding
Following this framework, I've reduced Pro consumption by 30–40% per week compared to using Pro by default for everything — without any noticeable drop in output quality for the tasks that matter.
A High-Velocity Iteration Workflow with Flash
Flash's speed advantage really shows when you structure your workflow around small, focused exchanges rather than large, complex prompts. I call this the "one prompt, one improvement" approach.
// Example: Incrementally improving a SwiftUI component with Flash
// Step 1: Ask for the basic implementation
// Prompt: "Create a SwiftUI list view that displays a list of products"
struct ProductListView: View {
let products: [Product]
var body: some View {
List(products) { product in
ProductRow(product: product)
}
}
}
// Step 2: Immediately follow up with the next improvement
// Prompt: "Add pull-to-refresh support"
// → Flash quickly adds the refreshable modifier
// Step 3: Continue the cycle
// Prompt: "Show an EmptyView when the list is empty"
// → Flash adds the conditional branch without needing re-explanationThis back-and-forth rhythm feels much more like pair programming than the traditional "write a big prompt and wait" pattern. With Flash, responses arrive quickly enough that you naturally start thinking in small increments rather than trying to front-load everything into one prompt.
Practical Tips for Reducing Credit Consumption
Beyond model selection, how you write prompts significantly affects credit consumption.
1. Minimize context: Only @mention the files directly relevant to your question. Avoid loading entire directories when a single function is what you actually need reviewed.
2. Write complete, self-contained prompts: "Do X, then Y, then Z" compound instructions can force multiple reasoning passes. Breaking them into separate prompts often works faster and uses credits more efficiently.
3. Check your model regularly: During long sessions, it's easy to drift onto Pro without noticing. A quick glance at the model selector every 20–30 minutes keeps things on track.
4. Start agents on Flash: When triggering an agent workflow, start with Flash and evaluate the result before escalating to Pro. Most agent tasks involving well-defined patterns — test generation, documentation, API scaffolding — succeed with Flash.
Where Flash Has Limitations (and What to Do About It)
Being honest about where Flash falls short helps set realistic expectations.
Multi-file changes with tight coupling: When a refactor touches 4 or more files with complex interdependencies, Flash can lose consistency between changes. This is a clear signal to switch to Pro.
Long session context drift: After roughly 15–20 conversation turns, Flash becomes less reliable at tracking earlier context. When this happens, starting a fresh session and re-introducing necessary context via @mention usually fixes the issue.
Architecture-level judgment calls: Questions like "should this be a microservice or stay in the monolith?" tend to produce surface-level answers from Flash. For decisions with significant long-term consequences, Pro is worth the extra cost.
Start with Flash-First Today
If you want to get more out of Antigravity without spending more, adopting a Flash-first habit is one of the highest-leverage changes you can make. The rule is simple: always try Flash first, and escalate to Pro only when Flash clearly isn't enough.
A practical starting point: open Antigravity right now, switch to Flash, and complete the next five tasks using only Flash. Notice which ones felt limited — those are your Pro use cases. The rest can run on Flash permanently.
For more on using Antigravity in iOS and Android app development, see Antigravity × iOS 26 & Android 17 App Development Workflow. For CI/CD automation, Antigravity × Xcode Cloud: iOS CI/CD Automation Guide has the details.