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AI · head to head

Anthropic API vs Weka

Anthropic API logo

Anthropic API

AI

Claude API for developers

From
On request
Free plan
No
Full reviewWebsite
Weka logo

Weka

Machine Learning

Collection of machine learning algorithms

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Weka has a free tier, so it costs nothing to try first.
  • Each has a real cost: Anthropic API pricing varies significantly by model tier; Weka the package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
  • They diverge on capability: Anthropic API covers Multiple models, Weka covers Classification.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Anthropic API and Weka actually diverge.

Attributes where Anthropic API and Weka differ
AttributeAnthropic APIWeka
Starting priceOn requestFree
Pricing modelusage-basedopen-source
Free tierNoYes
PlatformsApiLinux, Mac, Windows
CategoryAIMachine Learning
Founded20211993

Identical on both: user rating (Not yet rated).

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 Anthropic API

  • Multiple models
  • 200K context
  • Vision capabilities
  • Function calling
  • REST API
  • SDKs
  • Amazon Bedrock
  • Google Vertex

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.

Anthropic API

  • AI agent developmentnot Weka
  • LLM-powered API integrationnot Weka
  • Batch processing for cost optimizationnot Weka

Weka

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

Where each one falls short

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

Anthropic API

  • Pricing varies significantly by model tier
  • Batch processing and Fast Mode add additional surcharges
  • US-only inference costs 1.1x standard pricing

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

Anthropic API

On request
  • Fable 5$undefined/mo
    • Input: $10/MTok
    • Output: $50/MTok
    • Prompt caching Write: $12.50/MTok
  • Opus 5$undefined/mo
    • Input: $5/MTok
    • Output: $25/MTok
    • Prompt caching Write: $6.25/MTok
  • Sonnet 5$undefined/mo
    • Input: $2/MTok
    • Output: $10/MTok
    • Prompt caching Write: $2.50/MTok
  • Haiku 4.5$undefined/mo
    • Input: $1/MTok
    • Output: $5/MTok
    • Prompt caching Write: $1.25/MTok

Weka

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

Which should you pick?

Choose Anthropic API if

  • You need multiple models.
  • You work on Api.
  • You also want 200k context.
Anthropic API 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 Anthropic API or Weka better?
Neither clearly leads. Anthropic API starts at On request and Weka at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Anthropic API or Weka?
Weka has a free tier; the other does not. Paid plans start at On request for Anthropic API and Free for Weka.
Does Anthropic API or Weka run on more platforms?
Anthropic API runs on Api. Weka runs on Linux, Mac, Windows.
Can I use Weka for free?
Yes. Weka has a free tier, so you can try it without paying. Anthropic API starts at On request.
What is Anthropic API best used for?
Anthropic API is most often used for ai agent development, llm-powered api integration, batch processing for cost optimization. Of those, ai agent development and llm-powered api integration are not what Weka is typically brought in for.
What can Anthropic API do that Weka cannot?
Anthropic API covers Multiple models, 200K context, Vision capabilities, Function calling. Weka covers Classification, Regression, Clustering, Association rules.

Answered from the vendors’ own pages

Anthropic API: How much does the Claude API cost?

Claude API uses pay-as-you-go pricing per million tokens (MTok). Haiku 4.5 costs $1 input/$5 output per MTok; Sonnet 5 costs $2 input/$10 output; Opus 5 costs $5 input/$25 output; Fable 5 costs $10 input/$50 output per MTok.

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
Anthropic API: What discounts does the Claude API offer?

Batch processing saves 50% on API costs. Prompt caching reduces token costs by up to 90% for cached reads (charged at 80% discount compared to standard rates). Fast Mode for Opus 5 costs 2x standard pricing for up to 2.5x faster response speeds.

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
Anthropic API: Does the Claude API have different billing models?

Self-serve access uses usage-based tiers with automatic rate limit increases as volume grows. Enterprise customers receive custom rate limits, monthly invoice billing, and hands-on support at negotiated pricing.

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
Anthropic API: How much extra does US-only inference cost on the Claude API?

US-only inference costs 1.1x pricing for input and output tokens across all model tiers compared to standard multi-region pricing.

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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