# Weights & Biases: what AI models say (September 2026)

Source: Memetik Index, https://www.memetik.ai/vendors/weights-and-biases
Website: https://wandb.ai

Weights & Biases was named in 9 of 50 AI answers across 1 category. Best position: LLM observability and evals, 18% answer share, ranked #12, named first in 0%.

## What Weights & Biases is

Weights & Biases is an AI developer platform for building AI agents, applications and models. It is designed for AI developers. It offers a free plan, a Pro plan starting at $60 per month billed monthly, and custom Enterprise plans.

The platform builds and manages AI models, fine-tunes them for agentic tasks, and serves hosted and fine-tuned models. It supports iterating on, evaluating and monitoring agents. A registry stores datasets, models, prompts, code and metadata.

Pricing: It has a free plan, a Pro plan starting at $60 per month billed monthly, and custom Enterprise plans.
(From Weights & Biases's own website, read 2026-09-02.)

## By category

| Category | Rank | Answer share | Named first | Models |
|---|---|---|---|---|
| LLM observability and evals (https://www.memetik.ai/index/llm-observability) | #12 of 13 | 18% | 0% | GPT-5.6 Sol, ChatGPT, GPT-5.6 Luna, Claude Opus 5, Claude Fable 5, Sonar Reasoning Pro |

## What the models said

> "Choose Weave when W&B is already where your datasets, experiment lineage, and team habits live."
> — ChatGPT, LLM observability and evals