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Claude Code vs OpenAI Codex

Two terminal agent options for AI coding assistants. When each fits, what it costs, who moves from one to the other, and what makers who chose it say.

Claude CodeTerminal agentllms.txt
OpenAI CodexTerminal agentllms.txt
Ask your AI about this, with this page as the source:ChatGPT ↗Claude ↗Perplexity ↗

Which fits you

Choose Claude Code if
  • You're comfortable in a terminal and want to hand off whole tasks

Use it whenYou're comfortable in a terminal and want the agent to do the work while you review.

Trade-offUses Anthropic models only, and needs a Claude subscription or API credits.

Choose OpenAI Codex if
  • You're comfortable in a terminal and want to hand off whole tasks

Use it whenYou already pay for ChatGPT, or want an open-source CLI backed by OpenAI models.

Trade-offBuilt around OpenAI models, and usage limits depend on your ChatGPT plan.

At a glance

Claude CodeOpenAI Codex
Used by738 makers' products · 88 open-source projects136 makers' products
Cost at default usagedevelopers 1 seat$20/mo Pro$8.00/mo ChatGPT Go
Moved to it on GitHubpull requests since Oct 202445+ from OpenAI Codex34+ from Claude Code
Downloads18.9M/wk★ 126.3k
PricingIncluded in Claude Pro/Max subscriptions or billed via Anthropic API token usage. · paid from $20/moIncluded with ChatGPT plans (limited on Free; Go $8/month; Plus $20/month; Pro from $100/month; Business $20/user/month; Enterprise custom), extendable with credits; the CLI can also use an API key. · paid from $8/mo
Free tierNoYes
Open sourceNoYes
Incidents, 90 daysfrom its status page50+ (21 major)25+ (4 major)

Who moves from one to the other

Public pull requests on GitHub since Oct 2024 whose title says "Claude Code to OpenAI Codex" or the reverse — real code changes, by developers in general rather than makers only.

OpenAI Codex → Claude Code45+ PRs
All matching pull requests on GitHub ↗
Claude Code → OpenAI Codex34+ PRs
All matching pull requests on GitHub ↗

What makers say

Makers on using it for AI coding assistants, from Product Hunt and Starter Story interviews, each linked to the source. Products with a page of their own and fuller notes first.

On Claude Code
We build HarnessRouter with Claude Code, and HarnessRouter runs Claude Code as a product backend for other teams. It is both our daily driver and one of the harnesses we route to.
HarnessRouter, the makerSep 2026 ↗
We use Claude Code as our AI agent that addresses and responds to PR review comments. The headless mode made it incredibly easy to run an agent with repository context in a sandbox.
Merge, the makerSep 2026 ↗
Claude Code in VS Code is the closest thing to pair programming with a senior engineer. It reads my codebase, runs commands, and ships PRs right inside the editor I already live in.
Weavable, the makerSep 2026 ↗
530 more on the Claude Code page →
On OpenAI Codex
Codex is one of the three harnesses HarnessRouter routes to, and we use it in our own build loop. Its structured output made it one of the cleanest harnesses to normalize against.
HarnessRouter, the makerSep 2026 ↗
Helps us move faster from idea to implementation. Useful for prototyping, debugging, and shipping production-ready changes. A fast, reliable coding partner during development.
GetThis, the makerSep 2026 ↗
Helps us move faster from idea to implementation. Useful for prototyping, debugging, and shipping production-ready changes. A fast, reliable coding partner during development.
GetThis, the makerMay 2026 ↗
101 more on the OpenAI Codex page →

Loved and watch-outs

Themes that recur in makers' words and Hacker News comments, each linked to what it summarises.

Claude Code
Most loved
  • Holds deep context across large multi-module codebases, so one change can span UI, backend, docs and infrastructure. PHPH 2PH 3PH 4
  • Carries complex multi-step tasks through end to end, such as waiting on CI, reading logs and iterating until green. PHHNHN 2PH 2
  • Hooks, skills, subagents, plugins and MCP make it a host that teams extend and build products on. PHPH 2HNPH 3
Watch-outs
  • Quality can shift between releases because of harness changes, such as a quietly lowered default reasoning effort. HNHN 2HN 3HN 4
  • Subagents are opaque and hard to steer, and the default setup feels heavy, so power users strip tools and prompts. HNHN 2HN 3HN 4
  • The subscription only works inside Claude Code, not in other harnesses people prefer. HNHN 2HN 3
On Product Hunt: 5.0★, 736 reviews · mentioned most: code generation, complex software tasks, massive context window
OpenAI Codex
Most loved
  • Takes complete repo-wide tasks, from implementation through tests, debugging and release prep, and verifies them in the same environment. PHPH 2PH 3PH 4
  • Particularly strong at backend architecture and tracking down bugs from vague descriptions. PHHN
  • Usage limits are generous compared with Claude Code and Cursor. PHPH 2
On Product Hunt: 5.0★, 96 reviews

Who uses each

Claude Code738 makers' products
Accordio AIAdventoryAgent 37 Cloudagent-managerAgent-SinAgentcardAgentCenter for OpenClawAgentConnectAgenticCalling AIAgreeGuardAI Context FlowAI Shadowing+726 more
OpenAI Codex136 makers' products
agent-managerAgent-SinAgentRailAlmanacAmamiAmnesiaAmy by JellyfishAskCodiBuildermarkChertChronockClick+124 more
Used by both — often one replacing the other, or each for a different part of the product
agent-managerAgent-SinBuildermarkChertChronockColibotAIConstellation Gate AICosyraCronloop AIDeep Work PlanDMV by Agent CommunityEdgee

What makers pair each with

With Claude Code
Hosting
Database
Transactional Email
Frontend Framework
With OpenAI Codex
Hosting
Frontend Framework
Transactional Email
LLM API

Neither quite right?

See the whole AI coding assistants decision →
CursorAI-first editorA VS Code-style editor with AI completions, chat and agents built in, keeping your VS Code extensions.vs Claude Code →vs OpenAI Codex →
Devin Desktop (formerly Windsurf)AI-first editorA VS Code-style editor with unlimited Tab completions, an in-editor agent, and one place to manage local and cloud Devin agents.vs Claude Code →vs OpenAI Codex →
OpenCodeTerminal agentAn open-source coding agent that works with almost any model provider, local models, or an existing Copilot or ChatGPT subscription.vs Claude Code →vs OpenAI Codex →
GitHub CopilotEditor pluginAdding AI completions, chat and agents to the editor you already use, including VS Code and JetBrains IDEs, plus pull request reviews on GitHub.vs Claude Code →vs OpenAI Codex →