OpenAI Codex CLI vs OpenCode vs GitBook vs Google Antigravity

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
OpenAI Codex CLI
vs
Competitor 1
OpenCode
Competitor 2
GitBook
Competitor 3
Google Antigravity
Compare
4 tools · best value per row highlighted
Your tool OpenAI Codex CLI
developers.openai.com
OpenAI Codex CLI brings the Codex coding agent to the terminal and to scripts.
Remove
Competitor OpenCode
opencode.ai
OpenCode is an open-source AI coding agent that helps developers write code in the terminal, an IDE or a desktop app.
Make main Remove
Competitor GitBook
gitbook.com
GitBook is a documentation and knowledge platform for publishing product docs that work for both people and AI.
Make main Remove
Competitor Google Antigravity
antigravity.google
Google Antigravity assumes you already think in agent-driven workflows
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
—
—
—
14Mvisits/mo
MoM change
—
—
—
▼ 3.1%
6-month growth
—
—
—
-31.9%
Global rank web
—
—
—
—
Avg. last 3 months
—
—
—
15.4M
Bounce rate lower is better
—
—
—
48%
Pages / visit
—
—
—
2.2
Visit duration
—
—
—
3m 35s
Traffic sources
—
—
—
● Direct 58% · ● Referral 42%
OpenAI Codex CLIOpenCodeGitBookGoogle Antigravity
05.4M10.8M16.2M21.6MGoogle Antigravity · 12.1MGoogle Antigravity · 15.1MGoogle Antigravity · 15.9MGoogle Antigravity · 21.6MGoogle Antigravity · 20.5MGoogle Antigravity · 16.4MGoogle Antigravity · 21.5MGoogle Antigravity · 17.9MGoogle Antigravity · 14.4MGoogle Antigravity · 14M10M100MGoogle Antigravity · 12.1MGoogle Antigravity · 15.1MGoogle Antigravity · 15.9MGoogle Antigravity · 21.6MGoogle Antigravity · 20.5MGoogle Antigravity · 16.4MGoogle Antigravity · 21.5MGoogle Antigravity · 17.9MGoogle Antigravity · 14.4MGoogle Antigravity · 14MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Paid
Free
Freemium
Free
Starting price
—
Free
$65per month · free tier available
Free
Free tier
–
Free trial
–
–
–
API access
–
–
–
Plans
GPT-6-Astra $10GPT-6.1-Sol $2GPT-6-Luna $0.10GPT-Live-1 $0.05/minute+1 more
—
Free FreeEssential $65/moUltimate $249/moEnterprise Custom
—
Capabilities input → output
Input
CodeImagesText
CodeText
CodeText
CodeText
Output
Code
Code
DocumentsText
AppsCode
Skill level
Advanced
Advanced
Beginner-friendly
Advanced
Categories
Development & CodeAI Coding Assistant
Development & CodeAI Coding Assistant
Development & CodeEducation & LearningAI Developer ToolsAI Knowledge Management
Development & CodeProductivity & OfficeAI AgentAI Coding Assistant
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
4
6
8
9
Developer tools
Coding
–
Agents
–
Development
–
–
Terminal
–
–
Knowledge bases
–
–
–
Agent creation
–
–
–
Agent management
–
–
–
Code autocompletion
–
–
–
Code documentation
–
–
–
Knowledge
–
–
–
API docs
–
–
–
Customer support chatbot
–
–
–
Digital information management
–
–
–
Document creation
–
–
–
Frontend development
–
–
–
Local AI
–
–
–
Self hosted
–
–
–
Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 0
▲ 1
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
–
–
–
–

Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.