Claude 4 Sonnet

Claude 4 Sonnet is a model you reach through an API — too large to self-host, so this page covers what it does, how to access it, and what to run locally instead.

PARAMETERS

n/a

FORMAT

API

RUNS LOCALLY

BEST FOR

Coding, Quality

You don't run Claude 4 Sonnet locally

Access is through the hosted API.

Cloud/API only Claude 4 Sonnet with enhanced reasoning capabilities. Parameter count undisclosed (cloud API).

Strong local alternatives

Qwen3 235B A22B

235B — runs on one machine

Qwen3.5 122B-A10B Instruct

122B — runs on one machine

DeepSeek-R1 671B

671B — runs on one machine

More Claude models

Claude 3.5 Sonnet Claude 3.7 Sonnet Claude 3 Opus Claude 4 Opus Claude Opus 4.7 Claude Opus 4.8 Claude Fable 5

Frequently asked questions

Can I run Claude 4 Sonnet locally?

Not realistically. Claude 4 Sonnet is a vendor-undisclosed-size model; a Q4-class build would need far beyond any consumer machine. The hosted API or a smaller open model is the practical path.

How do I access Claude 4 Sonnet?

Through the vendor-hosted API. See the official source linked on this page.

What is the best local alternative to Claude 4 Sonnet?

Qwen3 235B A22B is the strongest local model we track (235B). It runs on a single high-memory Mac or GPU; see its page for exact hardware.

Cite this page

ModelFit: Claude 4 Sonnet — specs, memory math and hardware verdicts.
https://modelfit.io/models/claude-4-sonnet/ (dataset updated 2026-09-03, CC BY 4.0).