Weights & Biases vs Fiddler AI
Side-by-side from the Top 11 ranking of Galileo vs LangSmith vs Arize AI: 11 Best LLM Evaluation Platforms 2026. Last verified May 31, 2026.
The short answer
Weights & Biases ranks higher on Top 11 (#4 vs #7) for ML engineers and AI product teams measuring model quality. Extends best-in-class experiment tracking to LLM evaluation, perfect for systematic prompt engineering and development.
At a glance
| Weights & Biases | Fiddler AI | |
|---|---|---|
| Top 11 rank | #4 / Galileo vs LangSmith vs Arize AI: 11 Best LLM Evaluation Platforms 2026 | #7 / Galileo vs LangSmith vs Arize AI: 11 Best LLM Evaluation Platforms 2026 |
| Score (out of 9.4) | 8.7 | 8 |
| Best for | Experiment-centric evaluation | Enterprise model management |
| Pricing | $$$ ($500 to $5,000/mo) | $$$$ (Custom Enterprise Pricing) |
| HQ | San Francisco, USA | Palo Alto, USA |
| Founded | 2017 | 2018 |
Weights & Biases
Extends best-in-class experiment tracking to LLM evaluation, perfect for systematic prompt engineering and development.
wandb.ai/See full entry in Galileo vs LangSmith vs Arize AI: 11 Best LLM Evaluation Platforms 2026
Fiddler AI
A mature, comprehensive platform for managing both LLM and classical ML models in the enterprise.
www.fiddler.ai/See full entry in Galileo vs LangSmith vs Arize AI: 11 Best LLM Evaluation Platforms 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.