OpenAI Codex CLI vs OpenCode vs Knowledge Plane vs JetBrains AI Assistant

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
Knowledge Plane
Competitor 3
JetBrains AI Assistant
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.
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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 Knowledge Plane
knowledgeplane.io
Engineering teams watch their AI tools hallucinate outdated project details
Make main Remove
Competitor JetBrains AI Assistant
jetbrains.com
JetBrains AI Assistant brings AI chat, coding agents and code completion directly into JetBrains IDEs.
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
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6-month growth
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Bounce rate lower is better
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Pages / visit
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Pricing
Model
Paid
Free
Freemium
Freemium
Starting price
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Free
$19per month · free tier available
€8.33per month · free tier available
Free tier
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Free trial
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API access
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Plans
GPT-6-Astra $10GPT-6.1-Sol $2GPT-6-Luna $0.10GPT-Live-1 $0.05/minute+1 more
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AI Free FreeAI Pro (individual) €100/yrAI Pro (organization) €200/yr
Capabilities input → output
Input
CodeImagesText
CodeText
CodeDocumentsText
CodeText
Output
Code
Code
Text
Code
Skill level
Advanced
Advanced
Intermediate
Intermediate
Categories
Development & CodeAI Coding Assistant
Development & CodeAI Coding Assistant
Education & LearningAI Knowledge Management
Development & CodeAI Coding Assistant
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
4
6
12
5
Developer tools
Coding
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Agents
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Code autocompletion
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Knowledge bases
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Knowledge graphs
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Agent memory
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Knowledge
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Knowledge maps
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Knowledge sourcing
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Code documentation
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Codebase q a
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Development
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Digital information management
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Knowledge exchange
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Local AI
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MCP
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Self hosted
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Slack
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Terminal
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Community on aitoolstime
Rating
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Upvotes
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Saves
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Reviews
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Prompts
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Verified listing
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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.