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Claude Code moved Code Review out of preview, Codex added worktree tools, Gemini 4 Argon became generally available, and Copilot made local sandboxing generally available.
Review checks finished work, while sandboxes and rule checkers limit what an agent can reach.
Costs now depend on usage, so official pricing pages are worth checking before any purchase.
A coding agent can finish a task in minutes. Checking that work can take hours. That gap shapes much of the AI coding news from October 2026. Claude Code, OpenAI Codex, Google, and GitHub Copilot all shipped updates. Many of them address one question: How far can an agent's output be trusted?
AI coding assistants have moved past suggesting single lines of code. Modern agents read project files, change code across a codebase, and return a proposed solution for review. That shifts the developer's work from writing code to setting tasks, defining permissions, and checking results. October's releases show how tool makers are responding.
The table lists the main releases. Each one targets a different part of the workflow.
Anthropic says most reviews now finish in six to ten minutes, down from about twenty during the preview. Admins pick a quick, standard, or deep level for each repository. Code Review posts findings as comments. It does not approve or reject merges. Organizations with zero data retention cannot use it. Auto mode lets a built-in check approve routine actions instead of asking each time.
Worktrees let an agent experiment in a separate copy of the project. Changes made there are easier to inspect before joining the main project. The feature must be switched on first.
Gemini's shared window lets a model consider a large codebase in one request. More memory does not guarantee better answers. GitHub describes Claude Haiku 5.5 as a fast model for quick edits, terminal tasks, and helper agents. Computer use lets the AI operate desktop apps.
Many editors now let developers inspect AI changes before accepting them. The controls differ by product. Review and safety are still separate jobs. Review inspects a finished change. Safety limits what an agent can reach while it works. An agent can write a good feature and still open a private file.
Copilot's local sandbox covers the second job. It restricts files, network connections, and Git credentials for commands the agent runs. It starts switched off in the command-line tool. GitHub's documentation says that with the sandbox off, agent commands can reach the same files, networks, and credentials as the user's own account.
Bitdefender's AI Guardian takes a different route. Announced on September 30, the macOS beta is free during testing. It checks a supported agent's actions against user-set rules before they take effect.
Claude Code and OpenClaw are supported at specific versions at first. The sandbox limits what commands can reach. AI Guardian watches what the agent attempts. Neither replaces code review.
Official pages list current prices. Copilot plans include a monthly allowance of credits. Past that point, extra usage costs one cent per credit if a budget is set. Without a budget, usage stops until the next cycle. Details vary by plan. Basic code completions sit outside the allowance. Copilot code review also uses GitHub Actions minutes.
Gemini's API bills by use, based on how much text the model reads and writes. OpenCode, an open-source terminal tool, is free software. The model behind it still has a price. Some free models may change.
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Verification is likely to decide the next stage of competition. Speed is easy to demonstrate. Reliability takes longer to prove. Buyers are likely to ask vendors new questions. How are changes previewed? What can the agent reach by default? Who sees the record of its actions?
OpenAI introduced Dots on September 29, an always-on agent that works across apps. Other fields may face the same questions soon.
Teams that settle these questions early can adopt new tools with less friction. Teams that skip them may spend the saved time on cleanup.
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The most useful skill in this field may be choosing what to hand to an agent in the first place. Some tasks reward speed. Others reward a person who understands why the code exists. Tools will keep improving, but the choice of task will stay with people.
1. Who can use Claude Code’s Code Review?
Code Review is available to Claude Team and Enterprise organisations. It works on GitHub-hosted code, and an admin must switch it on. Findings appear as comments. The tool does not approve or reject merges. Organisations with zero data retention cannot use it.
2. What is a Git worktree, and why does Codex use it?
A worktree is a separate working copy of a project. An agent can try changes there while the main copy stays untouched. Codex added tools for managed worktrees on October 8. The feature is opt-in, so it must be enabled first.
3. Does Gemini 4 Argon’s one-million-token window guarantee better answers?
No. The window sets how much information the model can consider in one request. It says nothing about how well that information is used. Input and output share the same window. Introductory API prices are USD 2 for input and USD 10 for output per million tokens until November 30. After that, the rates are USD 4 and USD 20. These are per-use API rates, not subscription fees.
4. What is the difference between code review and a sandbox?
Code review inspects a finished change. A sandbox limits what an agent can reach while it works. Copilot’s local sandbox restricts files, network connections and Git credentials for commands the agent runs. It is included with Copilot at no extra charge. It starts switched off in the command-line tool. With it off, agent commands have the same access as the user’s own account.
5. How does GitHub Copilot pricing work now?
Copilot plans include a monthly allowance of credits. Past that point, extra usage costs one cent per credit if a budget is set. Without one, usage stops until the next cycle. Details vary by plan. Basic code completions sit outside the allowance. Copilot code review also uses GitHub Actions minutes. Official pricing pages list current terms.
