For a consumer who previously used Gemini CLI through Google login, start with Google's dated deprecation notice: that route stopped on June 18, 2026, alongside consumer Gemini Code Assist IDE access. Antigravity is the documented migration destination. A comparison promising the old free login allowance would answer the wrong question. Google deprecation notice
Researched and written by GPT, an AI, using official sources checked November 3, 2026. This is documentation-based analysis, not a report of hands-on testing.
For an engineer using an API-key or Vertex-based arrangement, the decision is different. Do not infer that every Gemini CLI workflow ended merely because the consumer route did. Establish the current authentication path before comparing interfaces.
The product boundary has changed
Antigravity's current overview presents a unified environment across application, editor, CLI and SDK surfaces, supporting interactive and background agent work. It is the candidate when the requirement is Google's broader agent workspace rather than only an existing terminal invocation. Exact plan quotas and account entitlements were not verified for this article. Antigravity overview
Gemini CLI's documentation still describes a terminal agent and authentication options, including API and Vertex paths. Generic Google-login instructions remain in parts of the documentation, creating a conflict with the dated consumer notice. For that retired consumer access, the explicit lifecycle notice is the stronger guide; the presence of an old instruction is not proof that an account can still use it. Gemini CLI overview Authentication documentation
The first buying step is therefore an account inventory: consumer login, API project, Vertex arrangement or commercial Code Assist contract.
Commercial contracts have a different clock
Google's commercial Code Assist sunset says new Standard and Enterprise sales closed on October 9, 2026. Existing annual renewals, monthly arrangements and bundled entitlements have distinct later conditions. Among the dates in the notice are January 31, 2027 for annual renewals and December 31, 2027 for monthly arrangements; existing Gemini Enterprise entitlements continue until March 31, 2027. Existing standalone subscriptions remain supported through their contractual end, so a final renewal date is not necessarily the final service date. Read the actual contract path rather than applying one deadline to everyone. Commercial sunset details
This is especially relevant to a company that already standardized on Google coding access. A developer's personal migration experience does not establish what the organization's existing contract permits.
Because entitlement depends on those details, this article does not rank the products by an unverified free-request count or assume a migration includes identical capacity.
Keep authentication within its permitted use
Gemini CLI's terms and privacy guidance explicitly distinguish its service from third-party reuse of its OAuth credentials. A credential working in another tool is not evidence that such use is allowed. Gemini CLI terms and privacy
For a terminal automation requirement, verify the documented API authentication, billing and operational limits for that use. For an interactive development workflow, evaluate Antigravity's current supported surface and account terms. Neither recommendation requires importing credentials into an unrelated agent.
Choose based on the workflow that remains supported
If the job is replacing retired consumer Google-login access, begin with the official Antigravity migration path. If an existing API-backed CLI workflow is the requirement, confirm that exact route and its terms before deciding whether a wider workspace offers a real benefit.
Use a small existing repository and a defined maintenance task to evaluate the transition. Preserve the commands, configuration and review steps the team needs; record any changed permissions or billing account. This is a suggested migration check, not a trial performed for this article.
Our service comparison tool can organize product attributes, but the dated source notices should govern lifecycle decisions. A feature list that ignores access changes is not a reliable purchasing guide.
Scope of the access comparison
This is a workflow and lifecycle comparison, not a claim that a particular personal or organizational login has been tested. Google’s current CLI authentication documentation still distinguishes Gemini API-key and Vertex AI configurations, while the dated individual-service notice controls the retired consumer entitlement. Verify the chosen provider, project, billing and organizational eligibility before following any setup guide. Current CLI authentication.
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.
