AI Tool Comparison

OpenAI Codex vs Gemini

An objective side-by-side comparison based on global rankings, AI scores, and monthly user data.

Higher Ranked
OpenAI Codex logo

OpenAI Codex

Coding

OpenAI's AI system specialized in translating language to code.

AI Score78.2 / 100

#90

Global Rank

–

Monthly Users

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VS
Gemini logo

Gemini

Writing & Chat

Google's multimodal AI assistant for text, images, code, and data analysis.

AI Score70.9 / 100

#167

Global Rank

350M+

Monthly Users

Visit GeminiFull Profile

Side-by-Side Comparison

OpenAI CodexGemini
CategoryCodingWriting & Chat
Global Rank#90#167
AI Score78.2/10070.9/100
Monthly Users–350M+
PricingFreemiumFreemium
Websiteopenai.comgemini.google.com

Pros & Cons

OpenAI Codex

  • Integrated directly into the widely-used ChatGPT interface rather than a separate tool
  • Token-based billing (since April 2026) more accurately reflects actual usage intensity
  • Business tier at $20/user/month annual provides an accessible team entry point
  • Pro 20x tier ($200/month) is currently paused for new sign-ups and upgrades as of September 2026
  • Average real-world cost ($100-200/developer/month) can exceed the advertised Plus tier price significantly
  • Cost varies significantly by model, concurrent instances, and fast mode usage, making budgeting less predictable

Gemini

  • Deeply integrated across Google’s broader ecosystem (Search, Workspace, Android)
  • Ultra tier pricing was reduced from its original $250/month, improving accessibility
  • API pricing offers genuinely low-cost options (Flash-Lite at $0.10/million tokens) for cost-sensitive applications
  • Full Workspace integration requires at least Business Standard ($14/user/month), not available on cheaper Workspace tiers
  • Credit-based system layered on top of tier usage limits adds complexity to understanding real usage capacity
  • Ultra tier’s $99.99-$199.99/month range represents significant cost for maximum usage limits and Deep Think access