Claude Opus 4.5 — Anthropic | Modeldex

Claude Opus 4.5

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Anthropic Claude Opus 4.5.

Updated 4 days agoStructured data from Modeldex catalog

VisionAgenticLong contextCode

API release

Nov 24, 2025(5 months ago)

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

History

Claude Opus 4.5 became available via the Anthropic API on 2025-11-24.

Training & availability

Anthropic has not released the underlying model weights — access is via their hosted API only.

Capabilities

Context window: 200K tokens.
Max output: 64K tokens.
Input modalities: text, image.

Recommended for: vision, agentic, long-context, code.

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-4-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Explain quantum computing in one sentence."}],
)
print(resp.content[0].text)

Benchmarks

Benchmark	Score	Source
SWE-bench VerifiedCoding	72.5% resolved	Third-party Papers With Code

Integrations & tooling support

Tool calling: Supported
Structured outputs: Supported

Price vs quality

Strong benchmark performance

Top-tier benchmarks. Pricing not publicly available — check the provider.

Quality percentile: 94.4%
Effective price: —
Pricing breakdown: — in
— out

Community ratings

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