Claude Opus 4.5

Anthropic · Released November 2025

Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.

It belongs to Anthropic's Claude family: Opus is the deep-capability tier and Claude Opus 5.5 leads it, Sonnet balances quality and speed, Fable is the most recently introduced line, and Haiku is the light tier.

Facts and pricing

Provider

Anthropic

Context window

200K tokens

Input price

60.0 credits / 1M tokens ($5.00 raw)

Output price

300 credits / 1M tokens ($25.00 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin. Raw prices shown per 1M tokens.

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What Claude Opus 4.5 is best for

• Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
• Long documents: the 200K-token window holds lengthy reports, contracts or papers whole
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

Example prompts

Prompts that suit a frontier model like Claude Opus 4.5:

• Review this business plan and give me the three hardest questions an investor would ask
• Rewrite this announcement so it lands with both engineers and executives
• I am choosing between two job offers, help me think through the tradeoffs
• Draft a technical design doc for a rate limiter, including failure modes

Anthropic family

All 18 Anthropic models

Model comparisons

• Claude Opus 5.5 vs Claude Opus 5
• Claude Opus 5.5 vs GPT-6 Astra
• Claude Opus 5.5 vs GPT-6 Sol
• Claude Opus 5.5 vs Claude Sonnet 5

Frequently asked questions

What is Claude Opus 4.5?

Claude Opus 4.5 is an AI model by Anthropic. Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.

How much does Claude Opus 4.5 cost on Zeplik?

Input tokens cost 60.0 credits per million and output tokens 300 credits per million (1 credit = $0.10; the raw provider rates are $5.00 and $25.00 per million). New accounts start with free credits.

How long can a conversation with Claude Opus 4.5 be?

Claude Opus 4.5 has a 200K-token context window (200,000 tokens), which covers the conversation plus any documents you attach.

Does Claude Opus 4.5 support images and tools?

Claude Opus 4.5 accepts image input and supports tool calling.

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