Claude Sonnet 4.5

Claude Sonnet 4.5 is an Anthropic model available in Quad Chat, with up to 1M tokens of context, image input, tool calling and step-by-step reasoning.

Claude Sonnet 4.5 at a glance

LabAnthropic
Available onPro plan and up
Context window1M tokens
Max output64K tokens
Image inputYes
Tool callingYes
ReasoningYes
Privacy lanePrivate (Zero Data Retention)

How to use Claude Sonnet 4.5 in Quad Chat

  1. Create a free account or sign in.
  2. Open the model picker and choose Claude Sonnet 4.5.
  3. Ask, attach files, or compare the answer with another model.

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Frequently asked questions

Can I use Claude Sonnet 4.5 for free?

Claude Sonnet 4.5 needs the Pro plan ($15/month) or higher. The Free plan needs no credit card and includes other chat models, so you can try Quad Chat first and upgrade when you need Claude Sonnet 4.5. Yearly billing is 15% less than paying monthly.

What is the context window of Claude Sonnet 4.5?

Claude Sonnet 4.5 accepts up to 1M tokens of context and can write up to 64K tokens in one reply, according to the model catalog Quad Chat routes through. Files, pasted text and earlier messages all count toward that window.

Does Claude Sonnet 4.5 support images, tools and reasoning?

Claude Sonnet 4.5 accepts images as input, so you can attach screenshots, photos and scanned pages. It supports tool calling. It can reason step by step before it answers. You can switch to another model in the same conversation at any time.

Is Claude Sonnet 4.5 private in Quad Chat?

Claude Sonnet 4.5 runs on the Quad Chat Private Lane, routed to providers under Zero Data Retention terms. Quad Chat does not train models on your conversations, encrypts chats in transit and at rest, and lets you export or delete them at any time.

How much does Claude Sonnet 4.5 cost in Quad Chat?

Quad Chat plans have a flat monthly price and draw usage from shared credits, not a per-token bill. The model picker shows an estimate before you send. For reference, the provider's API list price is $3.00 per million input tokens and $15.00 per million output tokens.

Can I compare Claude Sonnet 4.5 with other models?

Yes. Send one prompt to Claude Sonnet 4.5 and one or two other models, such as Claude Opus 5.5, Claude Opus 5 and Claude Opus 4.8, and compare the answers side by side in the same thread. You can also switch models mid-conversation without losing your files or context.

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