Claude Opus 4.1 API

Run anthropic/claude-opus-4.1 through FastInfra's OpenAI-compatible API. Pay per token, no subscription, routed to the cheapest available provider.

Read the docs
Pricing

Claude Opus 4.1 pricing

Billed per token used. Prices sync automatically from wholesale providers.

Direction Price per 1M tokens
Input$7.88
Output$39.38
Availability

Served by 2 providers

Requests route to OpenRouter by default (cheapest). Pin a specific provider with the :provider suffix.

Provider Upstream model ID
openrouter anthropic/claude-opus-4.1
openrouter anthropic/claude-opus-4.1:batch
Quickstart

Call Claude Opus 4.1 in 30 seconds

Works with any OpenAI SDK — change the base URL and API key only.

Python

from openai import OpenAI

client = OpenAI(api_key="YOUR_API_KEY", base_url="https://api.fastinfra.ai/v1")

response = client.chat.completions.create(
    model="anthropic/claude-opus-4.1",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

curl

curl https://api.fastinfra.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-opus-4.1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
FAQ

Claude Opus 4.1 — common questions

How much does the anthropic/claude-opus-4.1 API cost?

On FastInfra, anthropic/claude-opus-4.1 costs $7.875/1M input, $39.375/1M output tokens. Billing is per token used, with no subscription.

Is anthropic/claude-opus-4.1 compatible with the OpenAI SDK?

Yes. FastInfra exposes anthropic/claude-opus-4.1 through an OpenAI-compatible endpoint at https://api.fastinfra.ai/v1 — point any OpenAI SDK at that base URL with a FastInfra API key and keep your existing code.

Which providers serve anthropic/claude-opus-4.1?

anthropic/claude-opus-4.1 is available from 2 provider(s): openrouter, openrouter. Requests route to OpenRouter by default (cheapest); append ":provider" to the model ID to pin one.

Alternatives

Related models

Compare side by side: Claude Opus 4.1 vs Claude 3 Haiku · Claude Opus 4.1 vs Claude Haiku 4 5 · Claude Opus 4.1 vs Claude Sonnet 5

Claude 3 Haiku anthropic/claude-3-haiku $0.26 input · $1.31 output / 1M tokens Claude Haiku 4 5 anthropic/claude-haiku-4-5 $0.53 input · $2.63 output / 1M tokens Claude Sonnet 5 anthropic/claude-sonnet-5 $1.05 input · $5.25 output / 1M tokens Claude Haiku Latest ~anthropic/claude-haiku-latest $1.05 input · $5.25 output / 1M tokens Claude Sonnet 4 6 anthropic/claude-sonnet-4-6 $1.58 input · $7.88 output / 1M tokens Claude Sonnet 4.5 anthropic/claude-sonnet-4.5 $1.58 input · $7.88 output / 1M tokens