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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Cartesia
S
Fireflies
A
Claude Code
S
Sora
A
TaglineUltra-low-latency voice. Built for realtime agents.Sales-focused meeting AI with CRM integration.Anthropic's CLI agent. Opus-powered, operates on your repo directly.OpenAI's video model. Long clips, cinematic quality.
CategoryVoiceMeetingsCodingVideo
PricingFree tier + usage-based APIFree + $10-$19/user/moPart of Claude Pro/Max/Team plansIncluded with ChatGPT Plus/Pro
Best forDevelopers building voice agents, phone bots, interactive apps.Sales teams, customer success, anyone running many discovery calls.Developers who want an agent, not autocomplete. Large refactors, tests, docs.ChatGPT subscribers experimenting with cinematic shots.
Strengths
  • < 90ms latency — the fastest in the market
  • Sonic model sounds natural
  • Developer-friendly API
  • Good CRM integrations (Salesforce, HubSpot)
  • Talk-time + sentiment analytics
  • Call scoring
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Up to 20-sec clips at 1080p
  • Strong physics + scene composition
  • Storyboard feature for longer narratives
  • Remix existing videos
Weaknesses
  • Fewer voices than ElevenLabs
  • Less consumer-facing brand
  • Bot-joins (intrusive)
  • Gets expensive at team scale
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Stricter content policy than competitors
  • Hit-or-miss on complex motion
  • Text-in-video still struggles
Kai's verdictS-tier for realtime. If latency matters more than voice catalog, start here.A-tier for sales teams. B-tier for solo users.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.A-tier. Amazing when it works, frustrating when it doesn't. Runway still more reliable for pros.
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