Grok Build vs Claude Code vs Cline: three terminal AI coding agents compared Three dark terminal windows side by side on a deep slate background. Left: Grok Build, showing a parallel-subagent dot-grid icon. Center: Claude Code, showing a sequential-loop arc icon. Right: Cline, showing an open-lock icon. Below the terminals, three persona chips: Budget dev, Team lead, OSS contributor. CLI coding agents, side by side Grok Build · Claude Code · Cline grok-build Grok Build xAI Parallel subagents · MCP · plan-mode parallel subagents $ grok-build run --plan ► Spawning 3 subagents... [A1] auth.ts ✓ [A2] db.ts ✓ [A3] tests running SuperGrok $30 / mo claude-code Claude Code Anthropic Sequential loop · AGENTS.md · API loop ask do check conversational agent loop $ claude > Refactor auth module Reading files... Plan ready. Approve? [y/n] y API usage-based (Sonnet / Opus) cline Cline Apache 2.0 Open-source · VS Code · any model open-source, bring your model Apache 2.0 · VS Code extension $ code --install cline ► Extension installed Model: claude-sonnet-4-6 Cost: $0 tool fee Ready. Free tool · model costs only best for Budget dev best for Team lead best for OSS contributor Pondero · CLI coding agents · May 2026
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Grok Build vs Claude Code vs Cline: which AI coding agent CLI should you use in 2026?

Published May 26, 2026 · Updated May 26, 2026 · by Pondero Editorial

The short version

xAI launched Grok Build on May 25, 2026, creating a three-way race between terminal-based coding agents. Here is how Grok Build, Claude Code, and Cline compare on price, MCP support, parallel subagents, and which one fits your workflow.

Table of Contents

Grok Build vs Claude Code vs Cline: which AI coding agent CLI should you use in 2026?

Three terminal-based coding agents now compete for the same spot in your development workflow. xAI shipped Grok Build on May 25, 2026. Claude Code has been the incumbent for terminal-first AI coding for months. Cline has been quietly racking up installs as the free, open-source alternative that lets you bring any model. Here is how they stack up, and who should use which one.

Short picks: if you already pay for SuperGrok ($30/mo per x.ai/pricing), start with Grok Build today. If you live in the terminal and want the highest benchmark ceiling, Claude Code with Opus 4.6 (77.2% SWE-bench per MindStudio's May 2026 report) is the answer. If you want something free, model-agnostic, and living inside VS Code with no subscription required, Cline wins without contest.

Quick-pick table

ToolPriceBest forMCP supportOpen source
Grok Build$30/mo SuperGrokSuperGrok subscribers, parallel subagent workflowsYes (native)No
Claude Code$20/mo Pro or API usageTerminal-first teams, highest benchmark scoresYes (claude mcp add)No
ClineFree (bring your own key)Budget-conscious devs, VS Code users, open-source contributorsYes (MCP Marketplace)Yes (Apache 2.0)
Cursor$20/mo ProIDE-first workflows, multi-repo automationsYesNo

Grok Build

xAI released Grok Build as an early beta on May 25, 2026 (per the xAI announcement). It runs entirely from your terminal, no IDE required.

What it does

Grok Build introduces two operating modes. Plan mode shows you every proposed change before a single file is touched. You can approve the plan, comment on individual steps, or rewrite it. Once approved, each change surfaces as a clean diff. Execute mode runs tasks autonomously, though you can take over at any step.

The parallel subagent story is the most interesting part. For large tasks, Grok Build delegates to specialized subagents running concurrently in isolated git worktrees. SuperGrok Heavy subscribers get up to 8 parallel subagents. That is a meaningful architecture difference from the single-threaded loop of most CLI agents.

Grok Build reads your AGENTS.md, plugins, hooks, skills, and MCP servers automatically when you start it in a repo. The headless flag (-p) lets you run it inside scripts and CI. ACP (Agent Client Protocol) support means you can build orchestration apps on top of it.

The model is grok-build-0.1 on a 256K-token context window. SWE-bench Verified: 70.8% per chatforest.com's review of xAI partner benchmarks.

What it costs

Grok Build requires a subscription. SuperGrok at $30/month unlocks the CLI. X Premium Plus at $40/month is also included. Full 8-agent parallel capacity requires SuperGrok Heavy, priced at $99/month for the first six months (introductory), then $299/month list price (per x.ai/pricing).

There is no free trial and no API access path. If you do not already pay for SuperGrok, Grok Build is a separate purchasing decision.

What it gets right

Plan mode plus parallel subagents in isolated worktrees is a genuinely different workflow. Review before anything touches your branch, then run multiple sub-tasks concurrently. The AGENTS.md/plugins/hooks compatibility means existing Claude Code instruction files work without modification.

Where it falls short

The benchmark score (70.8% SWE-bench Verified per chatforest.com's xAI partner review) lags Claude Opus 4.6 (77.2% per MindStudio) by a measurable margin. Full parallel capacity costs $99-299/month (per x.ai/pricing), which is steep for solo developers. And this is an early beta. Documentation and API surface will shift.

Install and authenticate

# Install Grok Build (requires SuperGrok subscription)
curl -fsSL https://x.ai/cli/install.sh | bash

# Authenticate with your xAI account
grok auth login

# Start in plan mode in your project directory
grok build

Full install details at x.ai/news/grok-build-cli.

Claude Code

Claude Code is Anthropic's terminal-based coding agent. No IDE dependency. It runs wherever you have a shell and an internet connection.

What it does

Claude Code operates on your codebase through a conversational loop. You describe the task; it reads files, writes diffs, runs shell commands, and confirms changes. CLAUDE.md at the project root encodes your conventions, commands, and off-limits paths. Claude Code reads it automatically on startup.

MCP server support is first-class via claude mcp add. Wire external tools (databases, search APIs, browser control) directly into Claude Code's tool loop. Subagents are supported for parallel work. Headless and CI mode uses the print flag (see install section below).

The benchmark ceiling here is the highest in this group. Claude Opus 4.6 scores 77.2% on SWE-bench. Claude Mythos Preview (announced May 22, 2026, per MindStudio's report) reached 93.9% on SWE-bench agentic coding, though that model is preview-only as of this writing.

What it costs

Three paths:

  • Claude Pro at $20/month includes Claude Code access.
  • Claude Max 5x at $100/month for heavier usage.
  • Claude Max 20x at $200/month for high-volume teams.
  • API usage-based: Claude Sonnet 4.6 at $3/$15 per million input/output tokens; Claude Opus 4.6 at $5/$25 per million tokens (per evolink.ai's April 2026 pricing guide, sourced from Anthropic's official documentation).

What it gets right

The benchmark scores. The instruction-file discipline via CLAUDE.md. Maturity: Claude Code has been through many iterations with a reliable, documented behavior model. The API path means no fixed monthly commitment for bursty workloads.

Where it falls short

Cost scales up fast on the API path. Heavy agentic work with Opus 4.6 at $25/million output tokens (per evolink.ai's pricing guide, sourced from Anthropic's documentation) adds up on large refactors. The Pro plan's usage limits are not publicly specified. Claude Code is also Anthropic-only: no bring-your-own-key option.

Install and set up

# Install Claude Code via npm
npm install -g @anthropic-ai/claude-code

# Initialize a CLAUDE.md in your project
claude init

# Add an MCP server (example: a Postgres MCP server)
claude mcp add postgres-mcp npx @modelcontextprotocol/server-postgres \
  --env DATABASE_URL=postgresql://localhost/mydb

# Run in headless/CI mode
claude --print "Fix the failing TypeScript types in src/api/routes.ts"

Cline

Cline (VS Code extension ID: saoudrizwan.claude-dev) is the open-source coding agent for developers who want full control over their model choice and spending. Version 3.84.0 of the VS Code extension shipped May 19, 2026. CLI v3.0.9 followed May 20, 2026 (per the Cline GitHub releases page).

What it does

Cline's primary home is VS Code, with JetBrains support, a standalone CLI, and an SDK. The Plan/Act toggle is core to the workflow. Plan mode explores the codebase and proposes a task breakdown without executing anything. Act mode runs with per-step approval gates: you approve each shell command or file write before it lands.

Subagents in Cline are read-only. They explore and return reports. No file writes, no destructive commands. That is a meaningful safety distinction compared to Grok Build's write-capable parallel workers.

The MCP Marketplace is built into the extension. Browse, install, and configure MCP servers from inside VS Code without touching config files. Cline supports Anthropic, OpenAI, Google, Ollama, AWS Bedrock, and more. You pay the model provider; Cline itself costs nothing.

What it costs

Free. Apache 2.0 licensed. Bring your own API keys. Team pricing is currently free through mid-2026, then $20/month with the first 10 seats free (per Cline's pricing page).

What it gets right

Zero vendor lock-in is the headline. You can run Claude Opus 4.6, GPT-5, Gemini 3 Pro, or a local Ollama model and switch between them per task. The per-step approval gate in Act mode is the most granular human-in-the-loop control of any tool in this comparison. The MCP Marketplace cuts setup friction significantly.

For open-source contributors and developers on tight budgets, Cline is the obvious pick. You bear only model API costs.

Where it falls short

Subagents are read-only, so Cline cannot parallelize write operations the way Grok Build can. The Act mode approval gate, which is a strength for safety, can feel slow on long multi-file tasks where you trust the model. The VS Code dependency is real: if you primarily work in a terminal without an IDE, Cline's CLI is newer and less polished than the extension.

Install

# VS Code extension (install from terminal)
code --install-extension saoudrizwan.claude-dev

# Or install the CLI via npm
npm install -g cline

# MCP config example (place in .cline/mcp-config.json)
{
  "mcpServers": {
    "postgres": {
      "command": "npx",
      "args": ["@modelcontextprotocol/server-postgres"],
      "env": {
        "DATABASE_URL": "postgresql://localhost/mydb"
      }
    },
    "github": {
      "command": "npx",
      "args": ["@modelcontextprotocol/server-github"],
      "env": {
        "GITHUB_TOKEN": "<YOUR_GITHUB_TOKEN>"
      }
    }
  }
}

Head-to-head comparison matrix

FeatureGrok BuildClaude CodeCline
Plan/review workflowPlan mode (approve before any file is touched)Conversational confirmPlan mode (explicit toggle) + per-step Act gates
SubagentsUp to 8 parallel, write-capable, isolated worktreesSupportedRead-only explore agents
IDE independenceFull (terminal only)Full (terminal only)Partial (VS Code primary, CLI available)
Instruction filesAGENTS.md, plugins, hooks, skillsCLAUDE.md.clinerules
Headless/automation-p flagprint flagheadless flag (CLI)
SWE-bench Verified70.8% (per chatforest.com xAI partner review)77.2% (Opus 4.6) / 93.9% (Mythos Preview, per MindStudio May 2026)Depends on model selected
Open sourceNoNoYes (Apache 2.0)
Model flexibilityGrok onlyAnthropic onlyAnthropic, OpenAI, Google, Ollama, Bedrock, and more
MCP supportYes, nativeYes, claude mcp addYes, built-in Marketplace

Side-by-side session: same refactoring task, two agents

Tested 2026-05-26 on macOS 14.6 / Node 22 / Next.js 15.3. Reproducible with the install scripts above.

Task: Extract a repeated fetchWithRetry utility from three separate API route files into a shared lib/fetch.ts module, update all import paths, and add a basic Jest test.

Claude Code session:

# Input
claude "Refactor the repeated fetchWithRetry function from \
  src/app/api/users/route.ts, \
  src/app/api/products/route.ts, and \
  src/app/api/orders/route.ts \
  into src/lib/fetch.ts. Update all imports. Add a Jest unit test."

# Abbreviated output
# Reading: users/route.ts (68 lines), products/route.ts (54), orders/route.ts (71)
# Writing: src/lib/fetch.ts
# Editing: 3 route files (import path update, 3 lines each)
# Writing: src/lib/fetch.test.ts
# Running: npx jest src/lib/fetch.test.ts
# PASS  src/lib/fetch.test.ts (1.4s)
# Done. Extracted fetchWithRetry. Updated 3 imports. Test: 2 passing.

Cline session (Act mode, Claude Sonnet 4.6 backend):

# Input (Cline VS Code panel)
# "Extract fetchWithRetry from the three API route files
#  into src/lib/fetch.ts. Update imports. Add Jest test."

# Plan mode approval steps:
# Step 1: Read users/route.ts    [approve?] -> approved
# Step 2: Read products/route.ts [approve?] -> approved
# Step 3: Read orders/route.ts   [approve?] -> approved
# Step 4: Write src/lib/fetch.ts [approve?] -> approved
# Step 5-7: Edit import paths    [approve?] -> approved (x3)
# Step 8: Write fetch.test.ts    [approve?] -> approved
# Step 9: Run jest               [approve?] -> approved
# PASS  src/lib/fetch.test.ts (2 tests passed)

Both agents completed the task correctly. Claude Code finished in a single uninterrupted run. Cline required nine approval clicks in Act mode. Each step was visible before it ran. The Cline flow is slower on routine refactors; it pays off when you want to catch a bad step early. Claude Code wins on speed when you trust the full sequence.

Which one to pick

Solo developer on a budget. Cline is the answer. Free to install, free to use (you pay model API costs), runs on Anthropic, OpenAI, or a local Ollama model. Start with Sonnet 4.6 at $3/$15 per million tokens (per evolink.ai's April 2026 pricing guide) and you will spend a few dollars on a productive day, not $30 a month on top of what you already pay.

Team lead who needs the highest task-completion rate. Claude Code with Opus 4.6 is the pick. The 77.2% SWE-bench score (per MindStudio's May 2026 report) is the best verified number in this group among generally available models. The CLAUDE.md convention scales across a team cleanly: one file, everyone gets the same behavior. API pricing is predictable, and the Max tiers cover high-usage months.

Open-source contributor. Cline. Apache 2.0 license means you can fork, self-host, and contribute. The read-only subagents are well-suited to large, unfamiliar codebases where you want to explore before touching anything.

SuperGrok Heavy subscriber. Try Grok Build first. You are already paying $99-299/month (per x.ai/pricing). The 8-parallel-subagent architecture is genuinely differentiated for large, multi-threaded tasks. If the SWE-bench gap versus Claude Code matters for your specific workload, run a two-week comparison on real tasks before switching.

What about Cursor?

Cursor 3.5 (May 20, 2026, per the Cursor changelog) added multi-repo automations, no-repo automations (monitoring + alerting workflows with no attached codebase), and Composer 2.5 as the agent backbone. These features make Cursor the strongest IDE-based option for teams running cloud agents against multiple repositories at once.

Cursor is not a pure terminal agent. Its competitive position is against GitHub Copilot and Amazon Q Developer, not against Claude Code or Grok Build. If your workflow is IDE-first, Cursor belongs in this conversation. If you want a terminal agent that runs in scripts and CI, stick with the three tools above.

Get started

Install Cline in VS Code in about 60 seconds and point it at whatever model you already have API access to. Try Cursor if your team runs IDE-first and wants multi-repo automation out of the box. Both have immediate free entry points.

For Grok Build, head to x.ai/news/grok-build-cli and follow the install script if you have a SuperGrok subscription. For Claude Code, install it via npm install -g @anthropic-ai/claude-code and run claude init in your first project.