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Models / Anthropic

Claude Sonnet 4.5

$3/Mtok in

Frontier-quality text and reasoning through one OpenAI-compatible endpoint.

Playground

Try it in the browser

PlaygroundClaude$3 in / $15 out per 1M tokens

Facts

At a glance

Availability

Live

Pricing

$3 / M input · $15 / M output

Endpoint

Chat Completions

/v1/chat/completions

Context window

200k tokens

API

Call it from code

import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://api.companyfabric.com/v1",
  apiKey: process.env.COMPANYFABRIC_API_KEY,
})

const res = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-4-5",
  max_tokens: 1024,
  temperature: 0.7,
  messages: [{ role: "user", content: "Say hello from the fabric." }],
})

console.log(res.choices[0].message.content)

Prompt library

Example runs

Summarize the three biggest risks in this launch plan, then rewrite the executive summary in half the words.

This exact run cost $0.014

Review this pull request for correctness bugs. Explain each finding with the failing input.

This exact run cost $0.019

Turn these 12 support tickets into a prioritized product backlog with effort estimates.

This exact run cost $0.012

FAQ

Frequently asked questions

How much does Claude Sonnet 4.5 cost?

$3 / M input · $15 / M output. The exact cost of each call is shown before you run it and metered to your prepaid balance, no subscription required.

Why use Claude Sonnet 4.5 on CompanyFabric instead of going direct?

One key and one balance across every model in the library, at pricing at parity with or below the direct API. Switching models is a one-line change.

Is Claude Sonnet 4.5 available through the OpenAI SDK?

Yes, point any OpenAI SDK at api.companyfabric.com/v1 and set model to "anthropic/claude-sonnet-4-5".

Variants

Same family

Claude Haiku 4.5

$1/Mtok in

Anthropic

Fast, cheap frontier-family model for high-volume tasks.

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Claude Opus 4.6

$5/Mtok in

Anthropic

The frontier tier for the hardest reasoning and agentic work.

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Claude Fable 5

$10/Mtok in

Anthropic

Anthropic's first Mythos-class model, the new flagship tier above Opus, tuned for the hardest reasoning and agentic work.

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Claude Opus 5

$5/Mtok in

Anthropic

The Claude 5 generation's deep-work model, maximum-capability reasoning for research, architecture, and hard agentic tasks.

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Explore

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The previous stable Flash, still current for most work.

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Google's stable Pro tier, the non-preview reasoning model.

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Long-context workhorse on the stable 2.5 line.

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Gemini 3.1 Pro (preview)

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Google's newest Pro tier, shipped as a preview.

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One key. Every model. Exact prices.

Run Claude Sonnet 4.5 with free starter credits. Free starter credits included, no subscription required.

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