Together AI vs Weights & Biases

Together AI — Infrastructure · Private · $8.3B valuation · 4 of 4 figures sourced  |  Weights & Biases — Infrastructure · Acquired · 1 of 1 figure sourced

Relationship

Together Dedicated Container Inference and W&B Serverless Inference do comparable work on model hosting; both also serve buyers who need to serve a model in production; Weights & Biases is acquired, with no independent scale.

Assembled from the recorded fields for this pair, not hand-checked. The comparison below is read from each company’s own profile.

4 of 4 capabilitiesShared product type

4 of 4 capabilities — Shares GPU cloud, model hosting, model inference and 1 more.

Ludbee capability tags · from the product records

Shared product type — Both ship API service and developer tool.

Ludbee product records

Aligned comparison

FieldTogether AIWeights & Biases
Size$8.3B valuationnot disclosed
Employees350—
Founded20222017 5 yrs earlier
StatusPrivateAcquired
CategoryInfrastructureInfrastructure match
Stack layerAPI service, Developer tool, Infrastructure service, Model APIAPI service, Developer tool, Platform
HeadquartersSan Francisco, USASan Francisco, USA match

Capability overlap

Shared · 4

GPU cloudModel hostingModel inferenceModel training

Not verified for Together AI · 1

Evaluation and observability

Recorded for Weights & Biases. Together AI’s product records say nothing either way — a missing record is not a missing capability.

Together AI has no capability Weights & Biases lacks, among the 4 recorded here.

Products, side by side

Algorithmic pairing — assembled from recorded fields, not hand-checked

Together AI

API service

Together Batch InferenceAPI service

Asynchronous bulk inference for workloads that do not need a real-time response, priced below Together's serverless rate.

Together Fine-TuningAPI service

A managed service for fine-tuning open-source models on a customer's own data and serving the result on Together's infrastructure.

Developer tool

Together Custom TrainingDeveloper tool

Custom model training service covering supervised fine-tuning and direct preference optimization, billed per token.

Weights & Biases

API service

W&B Serverless InferenceAPI service

Hosted inference service for open-source and commercial LLMs (OpenAI, Qwen, Llama, Kimi, Phi, DeepSeek, Z.AI) without managing infrastructure.

Developer tool

W&B WeaveDeveloper tool

Tracing, evaluation and production monitoring for LLM and agent applications, capturing each call so prompts and outputs can be scored over time.

No counterpart

Together AI sells these in a stack layer with no product recorded for Weights & Biases yet — nothing on the other side to compare them against.

Infrastructure service

Together Dedicated Container InferenceInfrastructure service

Dedicated, reserved GPU containers for model inference with guaranteed performance, billed per GPU-hour.

Together GPU ClustersInfrastructure service

Reserved NVIDIA GPU clusters for training and large-scale inference.

Model API

Together InferenceModel API

Hosted API serving open-weight text, image and audio models, billed per token.

Weights & Biases sells these in a stack layer with no product recorded for Together AI yet — nothing on the other side to compare them against.

Platform

W&B ModelsPlatform

Experiment tracking for model training runs, recording hyperparameters, metrics and artifacts so runs can be compared, swept and reproduced.

W&B RegistryPlatform

Curated central repository providing versioning, aliases, lineage tracking and governance for models and datasets across the ML lifecycle.

W&B Serverless RLPlatform

Managed reinforcement-learning fine-tuning service for LLMs on CoreWeave's managed GPU cluster, billed per-token for rollouts with automatic scale-to-zero.

W&B Serverless SFTPlatform

Serverless supervised fine-tuning for LLMs on CoreWeave's managed GPU cluster, run alongside Serverless RL in a unified workflow via the Agent Reinforcement Trainer (ART) API.