75% of developers I surveyed prefer Claude Code – here’s why they choose it over Codex

A survey of 138 developers found that three out of four (75%) use Claude Code, giving it about twice the user base of OpenAI Codex. Developers cited specific technical advantages driving their choice, with a primary theme being its ability to hold a large codebase in context for coherent multi-file changes. Respondents also noted it plans and reasons through edits, leading to fewer corrections during complex refactors.

Key takeaways

• 75% of surveyed developers (138 total) prefer Claude Code, roughly double the adoption of OpenAI Codex.
• A key advantage is handling context across large codebases for coherent, multi-file changes.
• It plans and reasons through changes before editing, reducing corrections in complex refactors.
• Users report it produces better raw code quality and reasoning compared to Codex on the same tasks.
• It operates agentically in the terminal against real repositories, not just as an editor autocomplete.

Survey Results and Dominant Preference for Claude Code

A survey of 138 developers found that three out of four (75%) use Claude Code. This data shows Claude Code has about twice as many users as OpenAI Codex. Approximately a third of the respondents use Codex, with 22% using both Claude Code and Codex.

Key Reasons for Preference

Developers cited specific technical advantages driving their choice. A primary theme was that Claude Code holds a large codebase in context, allowing changes spanning many files to stay coherent. Respondents also noted it plans and reasons through changes before making edits, requiring fewer corrections during complex refactors.

Other frequently mentioned reasons include the perception that Claude Code produces better raw code quality and reasoning on the same tasks compared to Codex. Users also value its agentic operation in the terminal against the real repository and infrastructure, rather than functioning as an autocomplete inside an editor.

Key Technical Advantages Driving Claude Code Adoption

Developers cite several technical strengths that lead them to choose Claude Code. A key advantage, highlighted by 14% of respondents, is its ability to handle context across large, involved codebases, ensuring changes spanning many files stay coherent.

Reasoning Before Editing

9% of developers noted that Claude Code plans and reasons through changes before making edits, which reduces the need for corrections during complex refactors. As one user explained, it reads the entire repository before editing instead of guessing.

Superior Code Quality

Another 9% reported that Claude Code produces better raw code quality and reasoning on the same tasks compared to Codex. This perceived improvement in output is a direct factor in its preference.

Agentic Terminal Operation

7% of respondents emphasized Claude Code’s agentic operation in the terminal against real repositories and infrastructure. It moves through codebases, runs commands, and iterates toward a result, functioning as more than just an autocomplete tool inside an editor.

Workflow Integration, Trust, and Additional Perceived Benefits

Claude Code benefited from being first to market, leading to established skills, integrations, and workflows; switching incurs real costs, a point cited by 5% of surveyed developers.

Advanced Tooling and Trust Factors

Its agent tooling supports advanced multi-agent setups that Codex is still replicating, a factor for 4% of respondents. Separately, some developers expressed trust in Anthropic and active distrust of OpenAI as a company, also noted by 4%.

Additional user-cited benefits include Claude Code better explaining its reasoning as it works and having more tutorials and community material to learn from. Single-user responses highlighted specific perceived advantages: Claude Code asks permission before taking destructive actions, providing auditability and human oversight, and it can run on infrastructure like GitHub Actions, allowing it to keep working while the developer is away from their desk.