LangSmith
Observability & Evals · Free + paid
Platform for debugging and evaluating LLM apps
What is LangSmith?
A platform for debugging and evaluating LLM apps. A tool in the 'LLM evaluation and benchmarking' field, available as open source + a paid cloud-managed plan.
- LLM call logging and tracing
- Quality evaluation and error analysis
- Prompt / model performance monitoring dashboard
Pricing
Open source + paid cloud-managed plans
Open-source edition is free, SaaS managed edition is a paid subscription based on usage/seats
Estimate based on AI knowledge - please verify on the official site
Combos that work well with LangSmith
Verifying AI answers and SEO drafts
ChatGPT evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith tracks them. Responses below the threshold are not published automatically; the prompts, search, and data are fixed instead.
Cost: API pay-as-you-go + subscription (ChatGPT) / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Claude evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith tracks them. Responses below the standard are not published automatically, and the prompts, retrieval, and data are fixed.
Cost: Freemium (free + paid subscription) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Gemini evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces them. Responses that fall below the standard are not published automatically; prompts, retrieval, and data are revised instead.
Cost: Freemium (free + paid subscription) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
DeepSeek evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces them. Responses that fall below the standard are not published automatically; prompts, retrieval, and data are revised instead.
Cost: Open source (free) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Perplexity evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces them. Responses that fall below the standard are not published automatically; the prompts, retrieval, and data are fixed.
Cost: Freemium (free + paid subscription) / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Grok-2 evaluates response quality against a question set and ground-truth evidence. The LangSmith + Ragas + DeepEval combo has Ragas and DeepEval score hallucination, groundedness, and consistency, while LangSmith handles tracing. Responses below the standard are not published automatically; the prompts, retrieval, and data are fixed instead.
Cost: Subscription (including X subscription) + API pay-as-you-go / open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Llama evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces the results. Responses below the threshold are not published automatically; the prompts, retrieval, and data are fixed instead.
Cost: Open source (free, license conditions apply) / Open source + paid managed cloud plan
Verifying AI answers and SEO drafts
Mistral evaluates response quality against a question set and ground-truth evidence. In the LangSmith + Ragas + DeepEval combo, Ragas and DeepEval score hallucination, groundedness, and consistency, and LangSmith traces the results. Responses below the threshold are not published automatically; the prompts, retrieval, and data are fixed instead.
Cost: Open source (free) + API pay-as-you-go / open source + paid managed cloud plan
AI tools similar to LangSmith (alternatives)
LangSmith vs. alternatives at a glance
| AI | Pricing | Combos on the map | Connected tools | Free | Cheapest monthly | Korean |
|---|---|---|---|---|---|---|
| LangSmith | Free + paid | 10 | 5 | — | — | — |
| Braintrust | Free + paid | 0 | 7 | Yes | $249/mo | No |
| DeepEval | Free + paid | 10 | 7 | — | — | No |
| EleutherAI LM Evaluation Harness | Free + paid | 0 | 7 | — | — | — |
| HumanEval | Free + paid | 0 | 7 | — | — | — |
1 of these 5 tools have a free plan. Cheapest paid plan: Braintrust ($249/mo).
Combo and connection counts are based on the relationships recorded on AI Galaxy Map (2026-10-26); they are not a quality ranking.
LangSmith on AI Galaxy Map
- One of 27 AI tools in the Observability & Evals field.
- Connected to 5 other tools — #6 in its field.
- Part of 10 work combos recorded on the map.
Frequently asked questions
Can I use LangSmith for free?
Open source + paid cloud-managed plans. Prices can change, so check the official site before paying.
What works well with LangSmith?
Based on the combos on the map, there is a workflow such as "Verifying AI answers and SEO drafts" that uses it together with GPT, Ragas, DeepEval.
What AI can I use instead of LangSmith?
Tools that do the same job, such as Braintrust, DeepEval, EleutherAI LM Evaluation Harness, HumanEval, are connected to it on the map.