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Codex

OpenAI terminal-based coding agent. Fast Rust-based CLI.

AgentRanks Score: 58/100Proprietary CLIUpdated June 2026

Architecture

Overview

Codex CLI is OpenAI terminal-based coding agent. Built in Rust for speed with 240+ tok/s throughput. SWE-bench Verified 77.3% with GPT-5.3. Ideal for CI pipelines and high-volume edits.

Pros and Cons

Strengths

Rust-based speed
SWE-bench 77.3%
multi-model support
headless CI mode

Weaknesses

OpenAI-only
no plan mode
fewer dev tools than Claude Code

Best For

OpenAI terminal agent. Rust-based, 240+ tok/s, SWE-bench 77.3%.

Back to leaderboard

Verdict: Codex scores 58/100. For comparisons see the comparison hub.