LangSmith vs Weights & Biases:Which is more popular?
In September 2026, LangSmith had more branded searches than Weights & Biases among LLM observability platforms worldwide. LangSmith had about 74,000 branded searches, while Weights & Biases had 51,300. LangSmith made up 28.4% of all LLM observability platform searches we track, and Weights & Biases accounted for 19.7%. When we asked ChatGPT and Google AI Overviews about LLM observability platforms, LangSmith appeared in all five answers and Weights & Biases in one. LangSmith was mentioned before Weights & Biases in every answer.
Who do people search for more?
LangSmith, about 44% more searches than Weights & Biases
Who does AI mention more?
LangSmith, mentioned in every answer we collected
Who does AI recommend more?
LangSmith, named ahead of Weights & Biases in every answer
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Top LLM observability platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, LangSmith appeared in all five answers. Weights & Biases was mentioned in one out of five: in one of the three ChatGPT answers, but not in either of the two Google AI Overviews. LangSmith was listed before Weights & Biases in every answer.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Langfuse1st- LangSmith2nd
Arize Phoenix3rd
Braintrust4th
Datadog LLM Observability5th
Helicone6th
Lunary7th
Weights & Biases8th
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Langfuse5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- LangSmith5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Arize Phoenix5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Datadog LLM Observability5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Braintrust3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Helicone2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Lunary2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Weights & Biases1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about LLM observability platforms
5 answers
Asked ChatGPT
“Which LLM observability platform should I use?”
Asked ChatGPT
“What are the best LLM observability platforms?”
Asked ChatGPT
“What's the best LLM observability platform for a machine learning team?”
Searched Google, AI Overview
“llm observability platforms”
Searched Google, AI Overview
“llm monitoring tools”
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Is LangSmith or Weights & Biases more popular in search?
This chart shows how often people search Google for LangSmith and Weights & Biases by name. Each line represents a brand's share of searches for all eight LLM observability platforms we track, month by month, from English-language searches worldwide.
Share of searches by month for LangSmith, Weights & Biases. The figures are in the table below the chart.
View monthly share of searches table
| Month | Langfuse | LangSmith | Weights & Biases | Arize Phoenix | Helicone | Lunary | Braintrust | Datadog LLM Observability |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 29.3% | 29.3% | 31.5% | 4.4% | 2.1% | 1.7% | 0.63% | 0.95% |
| Nov 2025 | 29.4% | 29.4% | 31.8% | 4.4% | 2.1% | 1.4% | 0.64% | 0.76% |
| Dec 2025 | 29.8% | 29.8% | 30.7% | 4% | 2.7% | 1.5% | 0.77% | 0.77% |
| Jan 2026 | 33.3% | 27.2% | 28% | 4.8% | 3% | 2% | 1.1% | 0.7% |
| Feb 2026 | 34.9% | 28.5% | 25.1% | 5.1% | 3.1% | 1.4% | 0.93% | 0.93% |
| Mar 2026 | 34.9% | 28.7% | 25.2% | 5.1% | 3.1% | 1.4% | 0.6% | 0.92% |
| Apr 2026 | 33.6% | 27.6% | 28.4% | 4.9% | 3% | 1.1% | 0.73% | 0.58% |
| May 2026 | 35.7% | 29.4% | 24.7% | 4.8% | 2.6% | 1.2% | 0.78% | 0.78% |
| Jun 2026 | 37.1% | 30.5% | 21.9% | 5.5% | 2.2% | 1.2% | 0.81% | 0.81% |
| Jul 2026 | 39.3% | 32.4% | 19.1% | 4.7% | 1.9% | 1.3% | 0.86% | 0.46% |
| Aug 2026 | 41.2% | 27.7% | 19.2% | 7% | 2% | 1.3% | 1.1% | 0.37% |
| Sep 2026 | 42.3% | 28.4% | 19.7% | 5.1% | 1.7% | 1.4% | 1.1% | 0.34% |
How has the LangSmith and Weights & Biases comparison changed over the last 12 months?
3 findings
- The lead changed hands 3 times in the 12 months ending September 2026: LangSmith took it in February 2026, Weights & Biases took it in April 2026, LangSmith took it in May 2026.
- Across the 12 months ending September 2026, LangSmith’s share of searches among LLM observability platforms worldwide moved from 29.3% to 28.4%, and its estimated monthly branded searches held steady at 74K.
- Across the 12 months ending September 2026, Weights & Biases’ share of searches among LLM observability platforms worldwide moved from 31.5% to 19.7%, and its estimated monthly branded searches moved from 79.6K to 51.3K.
How did search popularity change for LLM observability platforms worldwide in September 2026?
2 changes
In September 2026, LangSmith gained share of searches among LLM observability platforms worldwide, from 27.7% to 28.4%.
In September 2026, Weights & Biases gained share of searches among LLM observability platforms worldwide, from 19.2% to 19.7%.
How are branded searches counted?
4 search terms
Brandwave collects information about searches that people make online using LangSmith’s and Weights & Biases’ names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
LangSmith
1 branded search term
- langsmith
Weights & Biases
3 branded search terms
- wandb
- weights and biases
- weights biases
Other head-to-heads among LLM observability platforms
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