Arize AI vs LangSmith: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Arize AI and LangSmith side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, LangSmith leads on lower entry price. We do not name an overall winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Best for you if:
- • You want a tool that provides a comprehensive, unified platform for the entire AI lifecycle from development to production
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
Best for you if:
- • You want a tool that provides deep visibility into non-deterministic LLM behavior
| At a Glance | Arize AI | LangSmith |
|---|---|---|
Starts at | Free plan, paid from $50/mo, billed monthly AX Pro plan | Free plan, paid from $39/seat/mo, billed monthly Plus plan |
Category | AI Observability AI Agents | AI Agents Developer Tools |
Rating | 4.3/5 G2 4.3 48 reviews | n/a |
Free plan | Yes | Yes |
Watch out for | Self-hosting is an Enterprise add-on | Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor. |
Choose Arize AI or LangSmith?
Choose Arize AI if
- You want a tool that provides a comprehensive, unified platform for the entire AI lifecycle from development to production
- You want a tool that offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI
Choose LangSmith if
- You want a tool that provides deep visibility into non-deterministic LLM behavior
- You want a tool that helps improve application performance and response quality
- Budget matters ($39/seat/mo, billed monthly vs $50/mo, billed monthly)
In-Depth Analysis
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Arize AI offers a generous free tier (AX Free) and an open-source option (Phoenix), making it highly accessible for individual developers and small teams.
Watch out
Self-hosting is an Enterprise add-on
Strengths
- Pro: Provides a comprehensive, unified platform for the entire AI lifecycle from development to production.
- Pro: Offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI.
- Pro: Built on open standards and open-source components, promoting transparency and flexibility.
- Pro: Includes an AI assistant (Alyx) to aid in debugging and accelerate development.
- Pro: Scalable for enterprise use with features like custom data limits, SOC2, and HIPAA compliance.
Weaknesses
- Con: The complexity of features might have a learning curve for new users.
- Con: Pricing for higher tiers is custom, which may require direct engagement with sales.
- Con: Specific limitations on trace spans and ingestion volume for free and lower-paid tiers.
Key features
LangSmith
Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
LangSmith Developer is $0 for one seat and 5,000 base traces/month.
Watch out
Traces over the included 5k/10k are pay-as-you-go. Seats are only the floor.
Strengths
- Pro: Provides deep visibility into non-deterministic LLM behavior
- Pro: Helps improve application performance and response quality
- Pro: Offers comprehensive monitoring and alerting capabilities
- Pro: Identifies systemic issues and user needs automatically
- Pro: Flexible integration with various frameworks and OTel
Weaknesses
- Con: Specific pricing details require visiting a separate page
- Con: Self-hosting is only available on the enterprise plan
- Con: Requires some setup (e.g., environment variables) to get started
Key features
Plans and prices: Arize AI vs LangSmith
| Tool | Plans and prices | Source |
|---|---|---|
| Arize AI |
| arize.com/pricing read Nov 9, 2026 |
| LangSmith |
| langchain.com/pricing read Nov 11, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Arize AI pricing and LangSmith pricing.
Key Takeaways
Arize AI
- Worth considering for AI observability
LangSmith
- Lower entry price: $39/seat/mo, billed monthly vs $50/mo, billed monthly
What the data shows
On the data below, LangSmith leads on lower entry price. We do not name an overall winner for this pair.
- Only Arize AI has a published user rating (4.3/5 from 48 reviews); LangSmith has none we can show.
- LangSmith has the lower entry price: $39/seat/mo, billed monthly (Plus) against $50/mo, billed monthly (AX Pro) for Arize AI.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Arize AI and LangSmith compare in 2026?
On the data below, LangSmith leads on lower entry price. We do not name an overall winner for this pair. Only Arize AI has a published user rating (4.3/5 from 48 reviews); LangSmith has none we can show. LangSmith has the lower entry price: $39/seat/mo, billed monthly (Plus) against $50/mo, billed monthly (AX Pro) for Arize AI. Both have a free plan.
What are Arize AI and LangSmith used for?
Arize AI: The AI & Agent Engineering Platform for LLM observability, evaluation, and development. LangSmith: Debug, monitor, and optimize your LLM applications and AI agents with comprehensive observability.
What does Arize AI cost vs LangSmith?
Arize AI's cheapest paid plan is AX Pro at $50/mo, billed monthly; it also has a free plan. LangSmith's cheapest paid plan is Plus at $39/seat/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Nov 11, 2026.
What's the main difference between Arize AI and LangSmith?
Arize AI's main strength: provides a comprehensive, unified platform for the entire AI lifecycle from development to production. LangSmith's main strength: provides deep visibility into non-deterministic LLM behavior.
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