Arize vs Braintrust (2026): Pricing, Features & Which to Choose

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

Lower starting price
Not comparable
Not comparable: Arize does not list a price
Free plan
Braintrust
Only Braintrust has one
Higher rating
Tie
4.2 against 4.2
Same job?
Yes
Both are AI Infrastructure & Agent Tooling tools

Side by side

Compared on	Arize	Braintrust
Our rating	4.2	4.2
Starts at	Not listed	$249/mo
Free plan	No	YesBetter
Category	AI Infrastructure & Agent Tooling	AI Infrastructure & Agent Tooling
Plans	See pricing	From $249/mo
Key features	Started in traditional ML drift and performance monitoring before expanding to LLMs Open-source Arize Phoenix framework for generative AI observability LLM evaluation and prompt versioning through a Prompt Hub Tracing built for multi-step, conversational agent applications $131M raised, valued at over $1 billion as of its February 2025 Series C	Evaluation-first platform, not just logging and tracing after the fact Lets teams test and score AI product behavior before shipping Tracing priced per GB for production observability $80M Series B led by ICONIQ Capital in February 2026 Backed by Andreessen Horowitz, Greylock, and Elad Gil
Pros	Covers both traditional ML monitoring and generative AI evaluation in one platform Open-source Phoenix framework gives a free, inspectable starting point before adopting the full platform Billion-dollar valuation and $131M raised signal real staying power	Evaluation-first approach catches failures a pure logging tool would only surface after the fact Strong-name investor backing signals real staying power in a crowded observability market Simple two-tier pricing is easier to reason about than usage-based competitors with many tiers
Cons	Enterprise pricing isn't published, so budgeting requires a sales conversation Broad scope spanning classic ML and generative AI can mean more setup than a single-purpose LLM tool Competes directly against well-funded peers like Braintrust and LangSmith in a crowded observability market	Jump from free straight to $249/month with no mid-tier option limits gradual scaling Per-GB tracing costs require monitoring at high production volume Newer entrant competing against more established observability platforms like Arize and LangSmith
Company	Arize AI, founded 2020	Braintrust, founded 2023

Prices come from each vendor's pricing page, last checked 20260808. Check the vendor before you buy.

FAQ

Questions people ask

Is Arize better than Braintrust?

In our reviews Arize scores 4.2 and Braintrust scores 4.2. The better pick depends on the job. Arize: Grew from traditional ML monitoring into a $1B+ AI engineering platform for evaluating agents in production. Braintrust: Raised an ICONIQ-led $80M Series B building the evaluation layer teams use to ship AI products with confidence.

Which is cheaper, Arize or Braintrust?

Arize: see pricing. Braintrust: from $249/mo.

Do Arize and Braintrust have free plans?

Only Braintrust has a free plan.

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