Vapi vs OpenCode vs OpenAI Codex CLI vs Retell AI

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

Your tool
Vapi
vs
Competitor 1
OpenCode
Competitor 2
OpenAI Codex CLI
Competitor 3
Retell AI
Compare
4 tools · best value per row highlighted
Your tool Vapi
vapi.ai
Vapi is a developer platform for building, testing and deploying voice AI agents that talk to customers on the phone.
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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.
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Competitor 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 Retell AI
retellai.com
Retell AI is a voice agent platform for automating phone calls.
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Traffic estimated monthly website traffic
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Bounce rate lower is better
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Pages / visit
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Pricing
Model
Freemium
Free
Paid
Paid
Starting price
$29per month
Free
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Free tier
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Free trial
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API access
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Plans
No Success Package FreeCore $29/moPro $999/moPremier Custom
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GPT-6-Astra $10GPT-6.1-Sol $2GPT-6-Luna $0.10GPT-Live-1 $0.05/minute+1 more
Pay as you go CustomEnterprise Custom
Capabilities input → output
Input
AudioText
CodeText
CodeImagesText
AudioText
Output
AppsAudio
Code
Code
AppsAudio
Skill level
Advanced
Advanced
Advanced
Intermediate
Categories
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Development & CodeAI Coding Assistant
Development & CodeAI Coding Assistant
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
11
6
4
10
Developer tools
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Coding
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Voice agents
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Call center automation
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Agent creation
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Agents
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Call agents
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Call answering
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Calls
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Customer calls
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Customer support
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APIs
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Agent testing
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Customer support automation
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Development
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Local AI
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SMS marketing
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Self hosted
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Terminal
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Community on aitoolstime
Rating
no ratings yet
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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.