Arize AX

What is Arize AX?

Arize AX is an AI engineering platform for watching and improving AI agents and LLM applications. You instrument your app, using OpenTelemetry-compatible tracing and pre-built integrations for more than 30 providers and frameworks, and Arize records inputs, outputs, tools, tokens, latency and cost. A feature called Signal periodically scans your traces, clusters repeat failures into a ranked list of issues, and attaches the pattern, the affected traces and a suggested fix to each. You then measure quality with online and offline evals, LLM judges, agent judges or code-based evaluators, and test changes in playgrounds and experiments before shipping. Human annotations, labeling queues, prompt versioning and trace replay are included. Plans are AX Free at $0 with 25k trace spans a month, AX Pro at $50 per month with 50k spans, and AX Enterprise with custom limits, self-hosting, SSO and audit logs. All plans have unlimited users and evals. Arize also offers Phoenix, an open-source, local-first tracing and evaluation tool.

Use cases

• Trace LLM agent runs in production
• Detect recurring agent failures automatically
• Evaluate agents with LLM-as-a-judge
• Compare prompt and model changes in experiments
• Track token, latency and cost per run
• Collect human annotations on traces
• Evaluate multi-turn conversations

Who it's for

• AI engineers
• ML platform teams
• Agent developers
• AI-native startups

Why use Arize AX

• Signal surfaces recurring problems from your traces, so you do not have to read them by hand.
• Unlimited users and evals on every plan mean the team can grow without per-seat or per-eval charges.
• Experiments let you check that a prompt, model or agent change actually improves results before release.
• OpenTelemetry compatibility fits into existing instrumentation.
• The open-source Phoenix tool offers a local-first path before you move to AX.

Arize AX features

• OpenTelemetry-compliant tracing with session support
• Signal issue detection that groups failures from traces
• Online and offline evals with unlimited volume
• Trace evals for agent trajectories and session evals for conversations
• Agent-as-a-judge and LLM-as-a-judge evaluators
• Playgrounds, datasets and experiments
• Prompt serving, versioning and Prompt Learning optimization
• Multi-modal tracing and evaluation for image, voice and PDF
• Custom dashboards, metrics and monitors
• Human annotations and labeling queues
• Self-hosted deployment, SSO and audit logs on Enterprise

Arize AX integrations

• OpenTelemetry
• Anthropic
• GitHub
• Claude Code

How to get started with Arize AX

1. Sign up for AX Free and instrument your agent with auto-instrumentation or OpenTelemetry to capture traces.
2. Enable Signal on a tracing project so it reviews new traces every 6 hours and files recurring issues.
3. Open an issue to see the pattern, evidence traces and proposed fix, then create an evaluator from it.
4. Run online and offline evals, annotate traces, and test fixes in playgrounds and experiments.
5. Upgrade to Pro or Enterprise as span volume, retention or security needs grow.

Arize AX limitations

• Free allows 25k spans a month with 15-day retention and 1 GB of ingestion
• Pro allows 50k spans a month with 30-day retention and 10 GB of ingestion
• Signal is limited to 10 issues a month on Free and 25 on Pro
• Managed agents, self-hosting, SSO and audit logs are Enterprise only

Arize AX pricing

Yes, Arize AX has a free plan. Paid plans start at $50 per month, according to the official pricing page on 24 Oct 2026.

Arize AX plans

• AX Free

  Free

  no credit card required

  • 25k trace spans per month
  • 1 GB ingestion per month
  • 15-day retention
  • 10 Signal issues per month
  • Unlimited users and evals

• AX Pro

  $50 per month

  • 50k trace spans per month
  • 10 GB ingestion per month
  • 30-day retention
  • 25 Signal issues per month
  • SOC 2 Type II and GDPR

• AX Enterprise

  Custom

  • Custom spans, ingestion and retention
  • SaaS or self-hosted deployment
  • Unlimited Signal issues
  • SSO, audit logs and HIPAA
  • Managed agents and custom SLAs

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Arize AX alternatives

The main Arize AX alternatives listed on Debuly are Langfuse, Braintrust, Helicone, Opik, OpenLIT and Confident AI. The table compares pricing and platforms; order is A–Z.

1. 

   Braintrust

   AI observability and evaluation platform for tracing LLM apps and agents, scoring outputs and catching regressions before release.

   Developer platformsCoding
   FreemiumVisit Braintrust (official site)
2. 

   Confident AI

   Evaluation and observability platform for LLM apps, built on the DeepEval framework, with tracing, datasets and regression tests.

   Developer platformsProductivity
   FreemiumVisit Confident AI (official site)
3. 

   Helicone

   Open-source LLM observability and AI gateway that logs requests, tracks cost and latency, and routes to 100+ models through one API.

   Developer platformsCoding
   FreemiumVisit Helicone (official site)
4. 

   Langfuse

   Open-source LLM observability and evaluation platform for tracing agents, managing prompts and scoring outputs.

   Developer platformsAutomation and agentsCoding
   FreemiumVisit Langfuse (official site)
5. 

   OpenLIT

   Open-source, OpenTelemetry-native platform for tracing, evaluating and guarding AI agents, with cost and GPU monitoring

   Developer platformsCodingAutomation and agents
   Open sourceVisit OpenLIT (official site)
6. 

   Opik

   Comet's open-source platform for tracing, evaluating and monitoring LLM applications and agents, self-hosted or in the cloud.

   Developer platformsAutomation and agentsCoding
   FreemiumVisit Opik (official site)

Arize AX FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from arize.com · fetched 23 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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