Three clear trade-offs decide the best agentic IDE in 2026: autonomy, model access, and security. Google Antigravity runs up to five autonomous agents in parallel and is available as a free public preview with Gemini model access. Cursor is the conservative, VS Code, native option, with a mature Pro tier around $20 per month and SOC 2 Type II evidence. Windsurf undercuts on price and experiments with features such as Arena Mode and Cascade agent plans, with Pro tiers reported between $15 and $20 per month.

Pick the wrong agent and you will pay for it in time, noise, or broken builds. Here is the verdict up front: if you need parallel, team‑style agent orchestration and generous Gemini access for exploration, include Google Antigravity on your shortlist. If you need stability, auditability and a VS Code native flow that you can run on production code, start with Cursor. If you want low cost plus rapid model experimentation, try Windsurf.

1. Define the work profile you intend to hand to an agent

Right now, your single organising question is this: do you want assistants that suggest, agents that execute, or an agentic IDE that treats AI as a teammate? The brief classifies tasks into three buckets. Small edits, single‑file refactors and autocompletions map to assistant‑style tools. Multi‑file refactors, cross‑cutting changes and work that requires running tests and shell commands map to agentic IDEs. If your needs are parallel execution of distinct tasks, Antigravity’s Manager view is relevant because it spawns multiple agents concurrently. If you need auditable edits inside a familiar VS Code environment, Cursor is the conservative choice. But if you want to compare model outputs cheaply and run experiments, add Windsurf because Arena Mode and Cascade plans are designed for that purpose.

Worked example: you have a feature that touches backend validation, a shared library and the front end. An assistant will give you snippets. An agentic IDE will orchestrate edits across those modules, run tests and propose a commit. If you want those edits done in parallel by different agents, Antigravity is the one flagged by multiple sources for parallelism.

2. Budget and pricing realities

Money is part of the decision. Several reviewers place Cursor Pro around $20 per month, reported in local currency as roughly £16 to £18. Cursor also publishes higher enterprise tiers that some sources describe as reaching up to $200 per month. Windsurf is reported inconsistently across sources: some writeups list Pro at about $15 per month, others at $20. The range matters for teams buying in at scale. Google Antigravity is currently distributed as a free public preview and includes Gemini family access; however, that free tier comes with the usual caveat that it may change once the product exits preview, and Google adjusted paid AI tiers at I/O in May 2026.

Practical advice: treat any published monthly price you find in commentary as provisional until you check vendor billing pages. Confirm currency conversion for UK procurement and ask vendors to commit written pricing for negotiated enterprise contracts.

3. Run controlled trials on representative tasks

Vendors differ on features but not on the one truth that matters to engineers: how the tool performs on your code. The brief lays out a simple trial matrix. First, replicate a new feature spanning backend and frontend. Second, run a multi‑module refactor. Third, do a test‑first bugfix.

Use concrete metrics: time to first working build, number of manual corrections required, and CI pass rate.

Use each product’s unique affordances during the trial. In Windsurf, use Arena Mode to run the same workflow across two models and record which output needs fewer edits. In Cursor, use background agents in Composer mode to see whether agent activity interrupts the developer flow or genuinely saves time. And in Antigravity, use the Manager view to spawn parallel agents but do this only on an isolated repository clone and ephemeral workspaces. Record performance consistently and prioritise reproducible tasks over synthetic microbenchmarks.

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4. Validate security and data handling

Security separates the cautious from the adventurous. The brief highlights at least one testing write‑up that found multiple critical vulnerabilities in Antigravity within hours of launch and another field report of a destructive D: drive wipe while using the preview. Those incidents prompted advisories to run Antigravity only on isolated or non‑sensitive projects during public preview.

Cursor is repeatedly cited with SOC 2 Type II evidence. Some reports describe Windsurf as claiming FedRAMP coverage at certain tiers. For production use, demand written security documentation: SOC 2 reports, a FedRAMP designation where applicable, an up‑to‑date penetration test summary, and a vendor security questionnaire completed against your template. For preview products, insist on disposable VMs, throwaway repositories and zero access to credentials or private datasets.

Worked example: for a regulated team, create an isolated CI runner with a read‑only mirror of your repo and no credentials. Grant the agent access only to that mirror. Capture agent artifacts such as implementation plans and screenshots and require those to be stored in your audit trail.

Model access determines what your agents can do and how costly they're to run. Antigravity provides deep integration with the Gemini family and Google Cloud tooling, and Google upgraded Antigravity at I/O in May 2026 with a CLI, an SDK and new Gemini model variants. Sources disagree on precisely which Gemini model was bundled at which time; one report cites Gemini 3.1 Pro in April 2026 while later coverage of I/O references Gemini 3.5 Flash. That illustrates how fast model lineups change.

Cursor advertises multi‑model choice and typically supports Anthropic Claude variants and OpenAI GPT models. Windsurf emphasises multi‑model experimentation, Arena Mode for side‑by‑side voting, and options for fast local context. If you need private model hosting or to route queries through internal keys, verify support for custom endpoints, on‑premise agents or proxying, and obtain written confirmation from the vendor.

Agents can make sweeping edits. The brief recommends process controls you should insist on. Require visual diff review, atomic commits or patch application, and pre‑merge CI gates. Use Git worktrees, ephemeral branches or feature flags to keep agent changes reversible. Several sources note that Antigravity agents produce artifacts like implementation plans and screenshots; require those artifacts to be saved as part of any automated workflow.

Also plan for backups and incident response. One field report links an agent interaction to severe local data loss. Maintain regular offsite backups, a rollback-priority list for critical repositories, and an incident playbook that names the on‑call people and escalation steps.

For single developers and small teams the Pro tiers in the market will usually suffice. For regulated teams or central IT, negotiate enterprise agreements and request SLA and incident response commitments in writing. Sources differ on Windsurf pricing and on whether Antigravity will remain free after preview. One reviewer flagged a June 1, 2026 billing transition for an alternative coding product, which is a reminder: confirm billing cutover dates and flex‑billing changes on vendor pages before migrating repositories or changing teams.

Worked example: if you plan to roll out an agentic IDE to 20 engineers, model the monthly and annual cost under different Pro and enterprise tiers and include projected cloud compute costs from model runs. Then ask each vendor for a written volume discount and an entry level enterprise SLA.

After a 30‑day trial, measure delivery velocity, defect rate from agent edits, developer satisfaction and cloud compute spend tied to agent runs. If you adopted Antigravity in preview, escalate to a security review before moving to core production repositories. Track both quantitative outcomes and qualitative feedback, because the latter will often decide whether agents reduce cognitive load or introduce new friction.

Finally, keep the list of supported models and the vendor billing page in procurement bookmarks. Sources disagree on feature bundles and prices across April and May 2026, so treat any external writeup as a starting point, not final authority.

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Confirm vendor billing pages and security evidence before you commit. The clearest calendar item is a reported June 1, 2026 flex‑billing transition for an alternative coding product; verify that date and any other vendor cutovers before you move repositories or switch tools.

This article was created with AI assistance.