Anthropic API vs LangSmith

Side-by-side pricing, features, and free plan comparison — everything you need to choose between Anthropic API and LangSmith.

Feature	Anthropic API	LangSmith
Starting price	Pay-as-you-go	$39/mo
Pricing model	usage	freemium
Free plan	Yes	Yes
Free trial	No	No

Frequently asked questions

Verified May 2026.

What is the difference between Anthropic API and LangSmith?

Anthropic API: API access to Claude 3.5 and Claude 4 models with a 200K context window. LangSmith: Observability, evaluation, and dataset management platform for LLM applications.

Which is cheaper, Anthropic API or LangSmith?

Anthropic API starts from Pay-as-you-go. LangSmith starts from $39/mo.

Does Anthropic API or LangSmith have a free plan?

Anthropic API: Yes, free plan available. LangSmith: Yes, free plan available.

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