Cost comparison of Codex CLI and Claude Code on the same tasks
10/06/2026 — 10/06, 18:17·1 sources (all)·1 reports (all)
Key takeaways
- A group of developers ran four real-world tasks on a fixed open-source repository, twice per CLI in headless mode, to compare the costs of C…
Background & analysis
On October 6, 2026, a post on DEV Community published a head-to-head cost measurement of Codex CLI and Claude Code running the same tasks. The authors argue that most "Codex vs Claude Code" comparisons either quote vendor benchmarks or recycle a single third-party token figure that gets copied from page to page, and that few of them publish the tasks, the prompts, or the commit, which leaves their numbers impossible to verify.
They describe their own approach as the boring version. Four real tasks were run against one pinned open-source repository. Each CLI ran every task twice, in headless mode, with the exact commands and prompts set out alongside the results.
Pricing came from the official pricing pages on the day of measurement. The post states the measurements were taken on 2026-10-06 using Claude Code 2.1.291 with claude-opus-5-5.
So that others can check or rerun the work, the authors released the prompts, the hidden acceptance tests, the run scripts, and the JSON records of all 16 runs — four tasks, two CLIs, two runs each.
The available excerpt cuts off mid-sentence right after naming the Claude Code version. It does not include the Codex CLI version used, the cost figures for any of the four tasks, or any conclusion about which tool came out cheaper.
AI-generated from 1 reports · updated 1 day ago
Latest turnA team ran four real tasks on one pinned open-source repository, twice per CLI in headless mode, to compare Codex CLI and Claude Code costs. They published the prompts, hidden acceptance tests, run scripts and the full JSON transcripts of all 16 runs so the numbers can be checked or rerun.
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A team ran four real tasks on one pinned open-source repository, twice per CLI in headless mode, to compare Codex CLI and Claude Code costs. They published the prompts, hidden acceptance tests, run scripts and the full JSON transcripts of all 16 runs so the numbers can be checked or rerun.
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