Codex CLI vs Gemini CLI

Side-by-side default footprint for the latest captured versions of both agents: request tokens, tool definitions, bundled skills, and sub-agent declarations.

Tokenizer

Benchmark data last updated June 24, 2026 UTC

Token footprint summary

1.02× spread

Gemini CLI loads 283 more default tokens than Codex CLI.

Default tokens

claude-opus-4-8 · total-only

13,506

13,789

-283

1.02×

Tools

11

8

+3

1.38×

Skills

5

2

+3

2.50×

Sub-agents

0

3

-3

Comparisons use each agent's latest captured hibench run. See methodology for capture details.