Quick answer
- Claude Code (Anthropic)
- Terminal-first agent. Models: Claude Fable 5, Claude Opus 4.8, Claude Sonnet 5, Claude Haiku 4.5
- Codex (OpenAI)
- CLI, IDE extension, cloud, desktop app. Models: GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna, GPT-5.5
- Community consensus
- Codex for usage headroom, Claude Code for planning + ecosystem, both for real work
- Model data verified
- July 18, 2026
The Two Tools, in Plain Terms
Claude Code is Anthropic's terminal-first coding agent. It runs the current Claude lineup, Claude Fable 5, Claude Opus 4.8, Claude Sonnet 5, Claude Haiku 4.5, and its identity is depth of workflow: MCP servers, subagents, hooks, skills, plan mode, and CLAUDE.md context files, plus experimental Agent Teams for multi-session orchestration and official --worktree support for running agents on isolated branches. It started as a pure CLI; a desktop app now exists too.
Codex is OpenAI's coding agent, and its identity is breadth of surface: a CLI, an IDE extension, a cloud offering, and a desktop app, shipped for macOS in February 2026 and Windows in March 2026, that OpenAI positions as a "command center" for agent work. It runs the GPT-5.6 family, GPT-5.6 Sol, GPT-5.6 Terra, and GPT-5.6 Luna, alongside the previous GPT-5.5 generation, and reads AGENTS.md context files. Since April 2026, its subscription usage is metered in credits.
This page compares the tools. If you want the model-family comparison, Claude vs GPT tier-by-tier with verified prices and benchmarks, that lives at Claude vs GPT for coding.
Head-to-Head: What Actually Differs
Across the dimensions that matter when you run agents on production code, here is how the two compare. No highlight column, because on this table neither tool is ours and neither one sweeps.
| Dimension | Claude Code | Codex |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Models | Claude Fable 5, Claude Opus 4.8, Claude Sonnet 5, Claude Haiku 4.5 | GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna, GPT-5.5 (older 5.x still selectable) |
| Context files | CLAUDE.md | AGENTS.md |
| Extensibility | MCP servers, subagents, hooks, skills, plugins | MCP support; smaller extension surface today |
| Surfaces | Terminal-first CLI; desktop app now available | CLI, IDE extension, cloud, desktop app (macOS Feb 2026, Windows Mar 2026) |
| Usage-limit reputation | Tighter at the $20 tier, per community reports | More generous at the $20 tier, per community reports; credit-based since April 2026 |
| Orchestration features | Plan mode, subagents, experimental Agent Teams, official --worktree | Ultra mode parallel subagents (Sol only), cloud task execution |
The extensibility row is where daily use diverges most. Claude Code's ecosystem, covered in our guide to MCP servers for AI coding and Claude Code orchestration, means complex workflows tend to be built around it. Codex's surface breadth means it meets you in more places, especially if your team lives in an IDE or wants cloud execution.
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Models and Benchmarks
The tools are only as good as the models behind them. Data below verified July 18, 2026; the full breakdown lives in the models hub, with tier pickers for the best Claude model and the best Codex model.
| Model | Tier | Price (per MTok) | Headline benchmark |
|---|---|---|---|
| Claude Fable 5 | frontier | $10 in / $50 out | SWE-bench Verified: 95.0% |
| Claude Opus 4.8 | flagship | $5 in / $25 out | SWE-bench Verified: 88.6% |
| Claude Sonnet 5 | workhorse | $3 in / $15 out | No score in our verified set |
| Claude Haiku 4.5 | fast | $1 in / $5 out | No score in our verified set |
| GPT-5.6 Sol | frontier | $5 in / $30 out | Terminal-Bench 2.1: 88.8% |
| GPT-5.6 Terra | workhorse | $2.5 in / $15 out | Terminal-Bench 2.1: 87.4% |
| GPT-5.6 Luna | fast | $1 in / $6 out | Terminal-Bench 2.1: 84.7% |
| GPT-5.5 | flagship | $5 in / $30 out | SWE-bench Verified: 88.7% |
Usage Limits, Billing, and What People Actually Say
The loudest recurring theme in dev communities and Hacker News threads is not capability, it is headroom. Since Codex moved to credit-based billing in April 2026, the widely reported sentiment is that Codex subscriptions feel more generous at the $20 tier: engineers describe running longer agent sessions before hitting a wall. Claude Code's limits are a frequent complaint at the same price point, we cover the mechanics in Claude Code usage limits and Codex usage limits & credits.
The counterweight, in the same threads: Claude Code keeps getting praised for planning and architecture depth, for holding a coherent plan across a long multi-file change, and for the ecosystem around it. Neither reputation is a lab measurement, both are community sentiment, but they are consistent enough across sources that we treat them as real signal.
The Real Answer Is Both
After months of running both daily, our conclusion matches what many engineers report: this is not a versus. We route planning-heavy, architecture-shaped stories to Claude Code and burn Codex credits on volume work, and the split pays for itself. The vendors seem to agree the tools coexist, OpenAI ships an official Codex plugin for Claude Code.
Two agents, one board
Route by task shape
Same gate for both
The full dual-tool playbook, which tasks go where and how the context files coexist, is in Claude Code and Codex together.