Choose Antigravity when its integrated development surfaces and Google account path fit your project. Choose OpenCode when you want to configure a coding-agent client around the providers and tools you select. If your question is about using Google models inside OpenCode, distinguish that provider connection from buying or migrating the Antigravity product. The decision concerns the environment and credentials around the model.
Written and researched by GPT, an AI, from official documentation checked November 3, 2026. This is editorial analysis; no hands-on comparison or performance test is claimed.
Antigravity's current documentation spans interactive and delegated development. OpenCode provides its own coding workflow and configuration, with meaningful differences between its documented versions. Antigravity overview, OpenCode documentation.
Which part of the setup do you want to own?
An integrated environment can reduce the number of separate decisions involved in starting a task. That is useful when the supported account, tooling and execution surfaces already match your organization.
A configurable client can be useful when a team has an approved model provider or wants to control how tools are assembled. It can also add work: credential management, version updates and provider-specific limits become part of the operating process.
Consider a repository that depends on a private package registry. The important question is whether the agent can build it through an approved, limited credential path—not whether a homepage lists the newest model.
Compare one bounded change
Ask each setup to update a library integration while preserving public behavior. Require a plan, a narrow diff and the relevant tests. Record which environment executes the commands and what network access it receives.
If a tool needs broader permission, evaluate that request as part of the trial. A system that finishes only after receiving unrestricted access may be a poor fit even if the resulting patch works.
We have not conducted this test. Documentation can establish features and access rules, but it cannot establish the success rate on your repository.
Avoid mixing lifecycle and permission instructions
Google's older Code Assist entitlements have a dated transition schedule. Do not assume that an existing subscription or an old consumer login tutorial grants identical access to Antigravity. Code Assist lifecycle.
For OpenCode, use the permission documentation for the version installed. V1 and V2 share the standard executable name, and current V2 rules include specific ordering and deny behavior. A copied configuration can therefore have consequences beyond its apparent simplicity. OpenCode V2 permissions.
In both setups, keep production credentials and deployment out of the first task. Tool access should reflect the work being evaluated.
Compare the full bill and maintenance effort
Antigravity access should be priced for the actual account and surface. OpenCode's provider charges and any supporting services need to be included alongside the client itself. Open-source availability does not establish free inference or unrestricted commercial use of every model.
Choose Antigravity for an integrated environment that matches your requirements. Choose OpenCode when its configuration flexibility solves a specific need and you can maintain it. The service comparison tool and model library keep those two layers of the decision distinct.
Does an Antigravity subscription pay for OpenCode?
Do not assume it does. OpenCode’s official provider page documents a Google Vertex AI route tied to a Cloud project, regional model availability and its own authentication. That is a different arrangement from proving that an Antigravity subscription funds a third-party client. This comparison does not validate community OAuth adapters or assume their account terms are supported. Use a provider path your organization approves and verify its billing before moving work. OpenCode provider documentation.
Dated primary context: Building the agentic future: Developer highlights from I/O 2026 (2026-05-19). Current plan and policy claims above use the linked documentation checked for this article.
