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Software · head to head

AI21 Labs vs LangSmith

AI21 Labs logo

AI21 Labs

Software

Enterprise language AI solutions

From
Free
Rated
-
Full reviewWebsite
L

LangSmith

Software

Know what your agents are really doing

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only AI21 Labs has a free tier, so it costs nothing to try first.
  • Each has a real cost: AI21 Labs the free allowance is $10 of credit lasting 7 days rather than an ongoing free tier; LangSmith usage beyond the included trace allotment is billed in LangChain Compute Units at $1.50 per LCU and Storage Units at $1.00 per LSU, an unfamiliar metering unit compared to flat per-seat pricing, as of August 2026.

Where they differ

Only the attributes on which AI21 Labs and LangSmith actually diverge.

Attributes where AI21 Labs and LangSmith differ
AttributeAI21 LabsLangSmith
Starting priceFreeOn request
Pricing modelusage-basedsubscription
Free tierYesNo
PlatformsApi, CloudWeb
Founded2017Unknown

Identical on both: user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in AI21 Labs

  • Jamba models
  • Long context
  • RAG engine
  • Writing tools
  • REST API
  • Amazon Bedrock
  • Cloud platforms
  • Api support

Only in LangSmith

Nothing recorded that AI21 Labs does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

AI21 Labs

  • Running long-context tasks on the Jamba model familynot LangSmith
  • Building and optimising production AI agents with Maestronot LangSmith
  • Routing between models to control cost and accuracynot LangSmith
  • Long-horizon agentic tasks needing stateful workspacesnot LangSmith

LangSmith

No use cases recorded yet. See the LangSmith review.

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

AI21 Labs

  • The free allowance is $10 of credit lasting 7 days rather than an ongoing free tier
  • Jamba Large is $2 per million input tokens and $8 per million output, so output-heavy work costs four times as much as input
  • Volume discounts, private cloud hosting and higher rate limits require a custom plan
  • Standard rate limits are not published

LangSmith

  • Usage beyond the included trace allotment is billed in LangChain Compute Units at $1.50 per LCU and Storage Units at $1.00 per LSU, an unfamiliar metering unit compared to flat per-seat pricing, as of August 2026.

Pricing, plan by plan

AI21 Labs

Free
  • Free TrialFree
    • Limited usage
    • API access
  • Jamba$0.2/per-million-input-tokens
    • 256K context
    • Hybrid architecture

LangSmith

On request

No published plan breakdown. See the LangSmith review.

Which should you pick?

Choose AI21 Labs if

  • You need jamba models.
  • You want to start without paying.
  • You work on Api, Cloud.
  • You also want long context.
AI21 Labs review

Choose LangSmith if

Nothing in the data separates LangSmith from AI21 Labs on the points above - pick on price and on how each one feels to use.

LangSmith review

Questions people ask

Is AI21 Labs or LangSmith better?
Neither clearly leads. AI21 Labs starts at Free and LangSmith at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, AI21 Labs or LangSmith?
AI21 Labs has a free tier; the other does not. Paid plans start at Free for AI21 Labs and On request for LangSmith.
Does AI21 Labs or LangSmith run on more platforms?
AI21 Labs runs on Api, Cloud. LangSmith runs on Web.
Can I use AI21 Labs for free?
Yes. AI21 Labs has a free tier, so you can try it without paying. LangSmith starts at On request.
What is AI21 Labs best used for?
AI21 Labs is most often used for running long-context tasks on the jamba model family, building and optimising production ai agents with maestro, routing between models to control cost and accuracy, long-horizon agentic tasks needing stateful workspaces. Of those, running long-context tasks on the jamba model family and building and optimising production ai agents with maestro are not what LangSmith is typically brought in for.
What can AI21 Labs do that LangSmith cannot?
AI21 Labs covers Jamba models, Long context, RAG engine, Writing tools.
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