Claude Opus 4.1 — Anthropic | Modeldex

Claude Opus 4.1

Active

Most capable Claude Opus model.

Updated 3 days agoStructured data from Modeldex catalog

VisionAgentic

Knowledge cutoff

Jan 31, 2025(1.2 years ago)

API release

Aug 5, 2025(9 months ago)

Not enough benchmark coverage yet for an Intelligence Index — needs at least 3 results across 2 categories.

History

Claude Opus 4.1 became available via the Anthropic API on 2025-08-05.

Training & availability

Training data has a knowledge cutoff of 2025-01-31 — information about events after that date is unlikely to appear in the model's responses. Anthropic has not released the underlying model weights — access is via their hosted API only.

Capabilities

Input modalities: text, image.

Recommended for: vision, agentic.

Limitations

The knowledge cutoff is 14 months old — this model will not know about recent events, releases, or API changes.

Quick start

Minimal example using the anthropic API. Copy, paste, replace the key.

from anthropic import Anthropic

client = Anthropic(api_key="sk-ant-...")
resp = client.messages.create(
    model="claude-opus-4-1",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Explain quantum computing in one sentence."}],
)
print(resp.content[0].text)

Cost calculator

Estimate your monthly bill. Presets are typical workload sizes.

Input tokens / month5.0M

@ $15/1M

Output tokens / month2.0M

@ $75/1M

Input cost

$75

5.0M × $15/1M

Output cost

$150

2.0M × $75/1M

Total / month

$225

$2700 / year

Integrations & tooling support

Tool calling: Supported
Structured outputs: Supported

Price vs quality

Premium pricing

Priced like a frontier model. Quality tier pending more benchmark coverage.

Quality percentile: —
Effective price: $60/1M
Pricing breakdown: $15/1M in
$75/1M out

Community ratings

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