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
Together AI
Only Together AI has one
Higher rating
Together AI
4.2 against 4.3
Same job?
Yes
Both are AI Infrastructure & Agent Tooling tools
Side by side
Compared on
Arize
Together AI
Our rating
4.2
4.3Better
Starts at
Not listed
Free
Free plan
No
YesBetter
Category
AI Infrastructure & Agent Tooling
AI Infrastructure & Agent Tooling
Plans
See pricing
Serverless InferencePay-per-token
Dedicated InferenceFrom $5.49/GPU-hr
GPU ClustersFrom $3.99/GPU-hr
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
Platform for training, fine-tuning, and running open-source AI models at scale
Usage-based pricing per token or GPU-hour depending on the service
$1.15B in annual bookings as of mid-2026
$8.3B valuation after an $800M Series C in July 2026
Customers include Cursor, Cognition, and Decagon
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
Strong focus on open-source models reduces dependence on closed providers
Massive, fast-growing customer base including major AI companies
Free tier lowers the barrier to testing before committing to production spend
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
Usage-based pricing requires careful monitoring at production scale
Open-model focus means less access to the newest closed frontier models directly
Best suited to teams with in-house ML engineering capacity to fine-tune models
Company
Arize AI, founded 2020
Together AI, founded 2022
Prices come from each vendor's pricing page, last checked 20260807. Check the vendor before you buy.
FAQ
Questions people ask
Is Arize better than Together AI?
In our reviews Arize scores 4.2 and Together AI scores 4.3. The better pick depends on the job. Arize: Grew from traditional ML monitoring into a $1B+ AI engineering platform for evaluating agents in production. Together AI: Crossed $1.15B in annual bookings, serving Cursor and Cognition among its customers.
Together AI
Arize
