Which one is cheaper?

One or both use custom pricing, so it depends on your specific needs.

Can I use either one for free?

Both offer free plans, so you can try each without paying. Start with whichever fits your workflow better and upgrade when you hit the limits.

Different approach here. AssemblyAI uses usage-based pricing, while LangSmith goes with hybrid. That changes the math depending on your team size and usage.

Which one is a better deal?

Depends on what you need. AssemblyAI: They're positioning as the developer-friendly, API-first alternative to Deepgram and Rev AI — competitive on price at scale but differentiated by the breadth of AI features (LLM Gateway, multichannel, etc.). The AWS Marketplace listing signals they're actively chasing enterprise procurement budgets.

AssemblyAI vs LangSmith Pricing (2026)

How do these two stack up on price? Here's what each one costs, what you get, and where the value sits.

	AssemblyAI pricing	LangSmith pricing
Starts at	Custom	$39/mo
Number of plans	2	3
Free plan
Free trial		—
Pricing model	usage-based	hybrid

Price is one row. To weigh the features too, use our feature comparison template →

AssemblyAI pricing

Official page

Pay as you go

$0/mo

Universal-3.5 Pro ($0.21/hr)
Universal-2 ($0.15/hr)
Universal-3.5 Pro Realtime ($0.45/hr)
Universal-Streaming ($0.15/hr)
Universal-Streaming Multilingual ($0.15/hr)
Sync API ($0.45/hr)
Voice Agent API ($4.50/hr)
Speaker Diarization ($0.02/hr pre-recorded, $0.12/hr realtime)
Medical Mode ($0.15/hr)
Keyterms Prompting
Prompting ($0.05/hr)
Speaker Identification ($0.02/hr)
Translation ($0.06/hr)
Custom Formatting ($0.03/hr)
Entity Detection ($0.08/hr)
Sentiment Analysis ($0.02/hr)
Auto Chapters ($0.08/hr)
Key Phrases ($0.01/hr)
Topic Detection ($0.15/hr)
Summarization ($0.03/hr)
Profanity Filtering ($0.01/hr)
PII Audio Redaction ($0.05/hr)
PII Text Redaction ($0.08/hr)
Content Moderation ($0.15/hr)
LLM Gateway
No minimum commitments
No credit card required to start

Custom

Custom rate limits
Enhanced concurrency
Enterprise-grade flexibility
Volume-based pricing
Custom starting concurrency limits

LangSmith pricing

Official page

Developer

$0/mo

Up to 5k base traces / mo, then pay-as-you-go
Community support
1 seat

Plus

Popular

$39/mo

Up to 10k base traces / mo, then pay-as-you-go
Access to Deployment, Engine, and more
Add unlimited seats

Enterprise

Custom

Self-hosted and hybrid deployment options
Custom SSO, ABAC, and RBAC
Support SLA
Custom seats and workspaces

AssemblyAI vs LangSmith FAQ

Which one is cheaper?: One or both use custom pricing, so it depends on your specific needs.
Can I use either one for free?: Both offer free plans, so you can try each without paying. Start with whichever fits your workflow better and upgrade when you hit the limits.
How do they charge?: Different approach here. AssemblyAI uses usage-based pricing, while LangSmith goes with hybrid. That changes the math depending on your team size and usage.
Which one is a better deal?: Depends on what you need. AssemblyAI: They're positioning as the developer-friendly, API-first alternative to Deepgram and Rev AI — competitive on price at scale but differentiated by the breadth of AI features (LLM Gateway, multichannel, etc.). The AWS Marketplace listing signals they're actively chasing enterprise procurement budgets.

Still deciding? See the best AssemblyAI alternatives or the best LangSmith alternatives, ranked with verified pricing.

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