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Understanding which models you can access and how they’re billed.

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Model Categories

Electron Hub has three main model categories:

Free Models

  • Models that end with :free (e.g., gpt-3.5-turbo:free)
  • Use Neutrinos instead of credits
  • No subscription required
  • Best for: Testing, light usage, learning
Uptime: We don’t guarantee 100% uptime at peak times (we host these ourselves and need to ensure fair usage)

Freemium Models

  • Models that don’t require a subscription
  • Do deduct credits from your balance
  • Available to all users (Free tier and above)
  • Better uptime than free models
  • Best for: Regular usage without subscription commitment

Premium Models

  • Models that require a subscription (Starter plan or higher) OR permanent credits
  • Free tier users with permanent credits can access premium models
  • Also deduct credits from your balance
  • Better uptime than free/freemium models

Ultimate Models

  • Models that require a Pro tier or higher subscription
  • Also deduct credits from your balance
  • Best for: Production applications, critical workloads

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Premium Model Examples

Popular Premium Models

  • gpt-4
  • o1, o1-low, o1-high
  • o3-pro, o3-pro-low, o3-pro-high
  • o3-deep-research
  • claude-sonnet-4-5-20250929
  • gemini-3-pro-preview

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Model Access by Tier

Free Tier

  • Free models (with Neutrinos)
  • Freemium models (with credits)

Free + Permanent Credits

  • Free models
  • Freemium models
  • Premium models (credits required)

Starter/Plus/Core

  • All freemium models
  • Premium models

Pro/Business/Enterprise

  • All models including
  • Premium models
  • Ultimate models
Note: Free tier users who have purchased permanent credits can access premium models (but not ultimate models). Ultimate models still require a Pro tier or higher subscription. Check the model list in the dashboard or API documentation to see which models require which tier.

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Why don’t free models guarantee 100% uptime?

Free models are hosted by Electron Hub directly, and during peak usage times, we need to ensure fair distribution of resources among all users.
For guaranteed uptime and better performance, we recommend:
  • Using freemium models (deduct credits but better uptime)
  • Subscribing to a premium tier to access premium models (routed to multiple providers)

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Model Status

Check Status

Check the Status Page for real-time uptime status of popular models.