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Codex vs Grok Build — OpenAI Multi-Surface Agent or xAI Terminal CLI?

Codex and Grok Build both help developers ship code with agents, but they start from different desks. Codex is OpenAI’s coding agent across app, editor, terminal, and cloud-style task surfaces, usually bought through ChatGPT plans or API-key CLI/SDK paths. Grok Build is xAI’s terminal-first coding agent with TUI/CLI controls, subagents, worktrees, and headless runs on SuperGrok / X Premium+ or xAI API metering. Use Codex when you want an OpenAI multi-surface coding loop. Use Grok Build when you want an xAI-native terminal agent. Existing aicoolies Scores: Codex overall 80, speed 72, privacy 68, developer experience 79 (Score date 2026-03-25); Grok Build overall 82, speed 84, privacy 72, developer experience 80 (Score date 2026-05-28). On those published totals Grok Build leads — still choose on product shape and ecosystem fit first; the scoreboard is secondary review evidence with those dates.

analyzed by Raşit Akyol September 17, 2026 updated September 28, 2026

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CodexwinnerGrok Build

Codex reviewGrok Build review

Verdict

Prefer Codex when you want OpenAI’s multi-surface coding-agent path and current CLI surface momentum (worktrees, Astra, Windows daemon). Prefer Grok Build when you want an xAI terminal agent with subagents, worktrees, and Memory. Score references stay as published: Codex overall 80 (Score date 2026-03-25); Grok Build overall 82 (Score date 2026-05-28) — Grok Build leads that scoreboard as secondary evidence. Product shape decides; neither Score alone settles today’s ships. Our pick: Codex.

Quick Comparison

Codexwinner

Pricing
Codex is included in ChatGPT plans: Free ($0) and Go ($8/month) with GPT-6 Luna in the desktop app (subject to rollout), Plus at $20/month (web, CLI, IDE extension, iOS and cloud integrations), Pro at $100, $200 or $500/month, Business at $20/user/month billed annually for 2+ users ($25 billed monthly), and Enterprise & Edu. API-key usage covers the CLI, SDK and IDE extension at API pricing, without cloud features such as GitHub code review and Slack. OpenAI says that starting in December 2026, the usage allowance of Plus, Pro and Business plans will be shared between ChatGPT and Codex and measured in tokens, with more advanced models and complex tasks using more of it; when it runs out you can wait for the reset, upgrade or buy credits.
Pricing Model
Paid
Platforms
Codex app, web/cloud tasks, CLI, IDE extension, SDK, GitHub review, Slack/Linear integrations, iOS, macOS, Windows, Linux.
Open Source
No
Telemetry
Concerns
Status
Active
Editorial Pick
✓ Recommended
Last Verified
Oct 14, 2026
Description
Codex is OpenAI's coding agent for software development across the Codex app, editor, terminal, and cloud tasks. It helps write, review, debug, refactor, and automate code, with ChatGPT plan access for managed surfaces and API-key usage for CLI, SDK, and IDE workflows. The open-source CLI and SDK support local repository work, while cloud features add GitHub review, Slack/Linear integrations, worktrees, skills, MCP, and automations.

Grok Build

Pricing
Commercial AI coding agent by xAI. Interactive terminal CLI access is included with SuperGrok ($30/mo) or X Premium+ ($40/mo) subscriptions. Headless and programmatic access is available via metered pay-as-you-go xAI API token billing.
Pricing Model
Paid
Platforms
CLI for macOS, Linux, and Windows via bash/WSL-style install; supports interactive TUI and headless single-prompt runs.
Open Source
No
Telemetry
Clean
Status
Active
Editorial Pick
—
Last Verified
Aug 26, 2026
Description
Grok Build is xAI’s terminal-first coding agent for planning, editing, testing, and reviewing code from a local CLI. It exposes subagent controls, worktree mode, headless JSON output, best-of-N parallel attempts, sandbox profiles, and cross-session Memory (/memory, /dream) for durable project conventions and facts. It fits developers comparing Claude Code, Codex, and Gemini CLI for local agentic workflows with deeper parallel execution.

What each product actually is

Codex is the OpenAI coding-agent stack: managed app/cloud/review-style surfaces plus CLI/SDK/IDE paths. The buyer job is often “delegate or pair across OpenAI’s tools,” not only a single terminal multiplexer.

Grok Build is an xAI shell-native agent: plan, edit, test, and review from the CLI/TUI with subagents and worktree-aware automation. The buyer job is terminal-first daily driving on the xAI stack.

Current surfaces (vendor-documented)

Codex (since the 2026-03-25 score date; spotlight Sep 2026): Ongoing CLI release train through 0.154 (Sep 2026) — GPT-6 Astra in the model picker / Bedrock catalogs; experimental worktree sessions (--worktree / /worktree); Windows shared background server / daemon lifecycle; agents dashboard, task queuing, and richer TUI/Vim/MCP tooling. Sources: https://github.com/openai/codex/releases (e.g. rust-v0.154.0 and nearby 0.15x tags).

Grok Build (since the 2026-05-28 score date; spotlight Sep 2026): Memory — background durable notes across sessions with /memory and /dream (xAI news, mid-Sep 2026); continued CLI UX — /workflow pause/stop, fuller bash output, headless timeouts, hooks/dashboard/MCP hardening. Sources: https://x.ai/news/grok-build-memory ; https://x.ai/build/changelog

Scoreboard (from existing reviews)

Codex (Score dated 2026-03-25): overall 80, speed 72, privacy 68, developer experience 79.

Grok Build (Score dated 2026-05-28): overall 82, speed 84, privacy 72, developer experience 80.

These figures come from the existing aicoolies reviews for each tool. On those published totals Grok Build leads across overall, speed, privacy, and developer experience. Prefer fit and current product surfaces (OpenAI multi-surface / worktrees / Astra vs xAI shell + Memory); use the table as supporting Score references with the dates above — not as today’s sole product proof.

Workflow — multi-surface OpenAI vs terminal xAI

Choose Codex for app/editor/terminal/cloud-style OpenAI workflows, ChatGPT-plan managed surfaces, and the newer CLI worktree/daemon direction. Choose Grok Build for shell-native xAI sessions with subagents, worktrees, and now cross-session Memory.

Billing and ecosystem posture

Codex: ChatGPT subscription plans for managed surfaces; API-key pay-as-you-go for CLI/SDK/IDE. Grok Build: SuperGrok / X Premium+ for interactive CLI; metered xAI API for headless. Cite catalog + vendor pricing pages; do not invent new plan math.