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Machine Learning · head to head

OpenRouter vs Weka

OpenRouter logo

OpenRouter

Machine Learning

Unified API gateway routing requests across 500+ models from 80+ providers

From
Free
Rated
-
Full reviewWebsite
Weka logo

Weka

Machine Learning

Collection of machine learning algorithms

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: OpenRouter no free tier; all usage incurs cost; Weka the package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which OpenRouter and Weka actually diverge.

Attributes where OpenRouter and Weka differ
AttributeOpenRouterWeka
Pricing modelusage-basedopen-source
PlatformsAPI, WebLinux, Mac, Windows
FoundedUnknown1993

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Machine Learning).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in OpenRouter

Nothing recorded that Weka does not also cover.

Only in Weka

  • Classification
  • Regression
  • Clustering
  • Association rules
  • Feature selection
  • Java
  • R
  • Python

What people use each for

The jobs each tool is most often brought in to do.

OpenRouter

  • Multi-model applications optimising for cost or performancenot Weka
  • Provider-agnostic deployments avoiding vendor lock-innot Weka
  • Enterprise applications with custom data policies and provider requirementsnot Weka
  • Development workflows testing multiple models without code changesnot Weka

Weka

  • Teaching and exploring classic machine learning algorithms through a GUInot OpenRouter
  • Running data mining experiments and preprocessing without writing codenot OpenRouter

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

OpenRouter

  • No free tier; all usage incurs cost
  • Pricing varies by model; specific rates not published on main site without account access
  • Adds latency through additional routing layer compared to direct provider APIs
  • Dependent on upstream provider uptime and API compatibility

Weka

  • The package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
  • Weka is split into a stable 3.8 branch that receives only bug fixes and compatibility-safe upgrades and a 3.9 development branch that may receive features that break compatibility
  • Weka requires a 64-bit Java VM; the bundled installers ship Bellsoft OpenJDK 25 per platform and architecture

Pricing, plan by plan

OpenRouter

Free
  • FreeFree
    • 50 requests per day
    • Access to 25+ free models across 4 providers
    • Community support
  • Pay-as-you-go$null/variable
    • 5.5% platform fee on inference costs
    • Access to 500+ models across 80+ providers
    • Email support
  • Enterprise$null/custom
    • Negotiable platform fees
    • 200,000 USD of list price inference per month with no fees, then 5% fee after
    • SSO/SAML support

Weka

Free
  • Open SourceFree
    • All ML algorithms
    • GUI and CLI
    • Java API

Which should you pick?

Choose OpenRouter if

  • You want to start without paying.
  • You work on API, Web.
OpenRouter review

Choose Weka if

  • You need classification.
  • You want to start without paying.
  • You work on Linux, Mac, Windows.
  • You also want regression.
Weka review

Questions people ask

Is OpenRouter or Weka better?
Neither clearly leads. OpenRouter starts at Free and Weka at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OpenRouter or Weka?
OpenRouter starts at Free and Weka at Free.
Does OpenRouter or Weka run on more platforms?
OpenRouter runs on API, Web. Weka runs on Linux, Mac, Windows.
Can I use OpenRouter for free?
Both have a free tier, so you can try either at no cost before committing.
What is OpenRouter best used for?
OpenRouter is most often used for multi-model applications optimising for cost or performance, provider-agnostic deployments avoiding vendor lock-in, enterprise applications with custom data policies and provider requirements, development workflows testing multiple models without code changes. Of those, multi-model applications optimising for cost or performance and provider-agnostic deployments avoiding vendor lock-in are not what Weka is typically brought in for.
What can OpenRouter do that Weka cannot?
Weka covers Classification, Regression, Clustering, Association rules.

Answered from the vendors’ own pages

OpenRouter: How much does OpenRouter charge?

OpenRouter charges a 5.5% platform fee on top of the actual inference costs from selected models. Customers purchase credits on a pay-as-you-go basis with no subscriptions or minimum spend requirements.

Source
Weka: What is the cost of Weka software?

Weka is provided at no cost as open-source software released under the GNU General Public License, making it freely available for download and use.

Source
OpenRouter: Is there a free tier?

Yes. OpenRouter offers a free tier with 50 requests per day and access to 25+ free models across 4 providers. The free tier provides community support only.

Source
Weka: Are there commercial licensing options available?

Yes, the project offers information about commercial licenses for organizations requiring non-GPL terms, which can be found in their commercial applications documentation.

Source
OpenRouter: What does the Enterprise plan include?

The Enterprise plan includes 200,000 USD of list price inference per month at no cost, with a 5% platform fee applied to usage above that threshold. It also includes SSO/SAML support, contractual SLAs, and dedicated support with a shared Slack channel.

Source
Weka: What support resources are available to users?

Multiple support avenues exist including comprehensive documentation, frequently asked questions, dedicated help resources, and access to courses for learning the platform.

Source
Weka: Is source code access provided?

Yes, developers have full access to source code through the Git repository, along with development documentation and code credits for contributors.

Source
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