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Head-to-head · LLM Observability Tools

Arize AX vs Opik

  • Updated Oct 2026
  • Both researched from official sources
  • 8 checks side by side
Higher score Arize AX #1 in LLM Observability Tools 9.4/10 Free plan Free plan✓ 6 of 6 features Visit Arize AX
Opik #4 in LLM Observability Tools 9.1/10 Free plan Free plan✓ 6 of 6 features Visit Opik

Arize AX leads on 0 checks, Opik on 1, and 7 are even. Who comes out ahead on the 8 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreArize AX · 9.4/10
  • Lowest starting priceOpik · $19/mo
  • Free planboth

Arize AX scores higher on our rubric for llm observability tools: 9.4 against 9.1 out of 10; our editors rank them #1 and #4.

Opik is cheaper to start at $19/mo against $50/mo.

Arize AX is the better fit for teams wanting broad, production-ready LLM observability. Opik is the better fit for cost-conscious teams needing full-stack observability.

  • Arize AX fits best

    Teams wanting broad, production-ready LLM observability

  • Opik fits best

    Cost-conscious teams needing full-stack observability

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Arize AX 9.4/10 Visit ↗ Opik 9.1/10 Visit ↗
At a glance
Editor score 9.4 9.1
Ranking #1 in LLM Observability Tools #4 in LLM Observability Tools
Best for Teams wanting broad, production-ready LLM observability Cost-conscious teams needing full-stack observability
Pricing model Free plan + paid Free plan + paid
Starting price $50/mo $19/mo (best)
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Community, Docs Email, Community, Docs
Compliance SOC 2, GDPR, HIPAA, SSO/SAML SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML
Integrations 18 integrations 40+ integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Arize AX 6/6 · Opik 6/6
LLM tracing ✓ ✓
LLM evaluations ✓ ✓
Prompt management ✓ ✓
Agent tracing ✓ ✓
Retrieval tracing ✓ ✓
Token cost tracking ✓ ✓
Specs
Deployment options Both Both
Our review
Pros
  • Covers tracing, evaluations, prompts, agents, RAG, and cost tracking
  • Supports SaaS and self-hosted deployment with Enterprise
  • Connects with major LLM providers and agent frameworks
  • Free self-hosted and cloud options cover core observability needs
  • Traces model calls, tools, retrieval steps, and agent actions
  • Tracks evaluations, prompts, human feedback, tokens, and model costs
Cons
  • Free plan limits usage to 10 Signal issues per month
  • Enterprise pricing is custom
  • Self-hosted deployment is available only on Enterprise
  • Enterprise pricing is custom rather than published
  • Self-hosted deployment requires your own infrastructure
  • Its broad scope may exceed teams needing only basic tracing
Our verdict

Arize AX is an AI engineering platform for teams building AI agents and applications. It captures production traces, evaluates LLM, agent, human, and code quality signals, and supports experiments comparing prompts, models, and agent…

Read the review →

Opik is an open-source LLM observability and evaluation platform from Comet for teams building chatbots, retrieval-augmented generation pipelines, and multi-step agents. It records model calls, tool invocations, retrieval steps, and agent…

Read the review →
  1. Arize AXLLM Observability Tools 9.4Free plan
  2. OpikLLM Observability Tools 9.1Free plan

Strengths and trade-offs

  • Arize AX — where it wins

    • Covers tracing, evaluations, prompts, agents, RAG, and cost tracking
    • Supports SaaS and self-hosted deployment with Enterprise
    • Connects with major LLM providers and agent frameworks

    Where it doesn't

    • Free plan limits usage to 10 Signal issues per month
    • Enterprise pricing is custom
    • Self-hosted deployment is available only on Enterprise

  • Opik — where it wins

    • Free self-hosted and cloud options cover core observability needs
    • Traces model calls, tools, retrieval steps, and agent actions
    • Tracks evaluations, prompts, human feedback, tokens, and model costs

    Where it doesn't

    • Enterprise pricing is custom rather than published
    • Self-hosted deployment requires your own infrastructure
    • Its broad scope may exceed teams needing only basic tracing
  • Arize AX9.4/10 · Free plan

    Broad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.

    Visit Arize AXFull verdict →
  • Opik9.1/10 · Free plan

    A broad, cost-conscious stack for tracing, evaluation, prompts, monitoring, and agent debugging.

    Visit OpikFull verdict →

More comparisons

All LLM observability tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update