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AI · head to head

Arize AI vs OpenRouter

Arize AI logo

Arize AI

AI

AI engineering platform for observability and evaluation of agents and LLM apps

From
Free
Free plan
Yes
Full reviewWebsite
OpenRouter logo

OpenRouter

Machine Learning

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

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Arize AI the free plan caps trace spans at 25,000 per month with only 15 days of retention.; OpenRouter no free tier; all usage incurs cost
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Arize AI and OpenRouter actually diverge.

Attributes where Arize AI and OpenRouter differ
AttributeArize AIOpenRouter
Pricing modelfreemiumusage-based
Platformsweb, apiAPI, Web
CategoryAIMachine Learning

Identical on both: starting price (Free), free tier (Yes), 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 Arize AI

  • End-to-end tracing
  • Evaluation framework
  • Prompt testing and improvement
  • Alyx AI engineering agent
  • Custom dashboards
  • Data warehouse integrations

Only in OpenRouter

Nothing recorded that Arize AI does not also cover.

What people use each for

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

Arize AI

  • Tracing and debugging production AI agentsnot OpenRouter
  • Running large-scale evaluations across traces and sessionsnot OpenRouter
  • Improving prompts before production rolloutnot OpenRouter
  • Storing and querying GenAI traces alongside a data warehousenot OpenRouter

OpenRouter

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

Where each one falls short

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

Arize AI

  • The free plan caps trace spans at 25,000 per month with only 15 days of retention.
  • Self-hosted deployment and Data Fabric integration are restricted to the custom-priced Enterprise tier.
  • Pricing beyond the $50/month Pro plan requires a custom quote, making cost planning less transparent at scale.
  • Advanced compliance features like HIPAA are only available on Enterprise.

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

Pricing, plan by plan

Arize AI

Free
  • AX FreeFree
    • 25k trace spans/month
    • 1 GB storage/month
    • 15-day retention
  • AX Pro$50/month
    • 50k trace spans/month
    • 10 GB storage/month
    • 30-day retention
  • AX Enterprise$undefined/mo
    • Custom trace spans, storage, and retention
    • SaaS or self-hosted deployment
    • Managed agents and Data Fabric

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

Which should you pick?

Choose Arize AI if

  • You need end-to-end tracing.
  • You want to start without paying.
  • You work on web, api.
  • You also want evaluation framework.
Arize AI review

Choose OpenRouter if

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

Questions people ask

Is Arize AI or OpenRouter better?
Neither clearly leads. Arize AI starts at Free and OpenRouter at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Arize AI or OpenRouter?
Arize AI starts at Free and OpenRouter at Free.
Does Arize AI or OpenRouter run on more platforms?
Arize AI runs on web, api. OpenRouter runs on API, Web.
Can I use Arize AI for free?
Both have a free tier, so you can try either at no cost before committing.
What is Arize AI best used for?
Arize AI is most often used for tracing and debugging production ai agents, running large-scale evaluations across traces and sessions, improving prompts before production rollout, storing and querying genai traces alongside a data warehouse. Of those, tracing and debugging production ai agents and running large-scale evaluations across traces and sessions are not what OpenRouter is typically brought in for.
What can Arize AI do that OpenRouter cannot?
Arize AI covers End-to-end tracing, Evaluation framework, Prompt testing and improvement, Alyx AI engineering agent.

Answered from the vendors’ own pages

Arize AI: What does Arize AX cost?

Arize AX offers a free plan, a Pro plan at $50/month, and a custom-priced Enterprise plan, with pricing based on trace spans, storage, and retention needs.

Source
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
Arize AI: Is there a free plan, and what are its limits?

The AX Free plan includes 25,000 trace spans and 1 GB of storage per month with 15-day retention, plus unlimited users, evaluations, and experiments.

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
Arize AI: What deployment options are available?

Free and Pro plans are SaaS-only, while Enterprise customers can choose SaaS or self-hosted deployment with custom SLAs.

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
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