Is Claude Opus 4.5 free?

No, Opus 4.5 is a premium model available to Claude Pro and Team subscribers ($17/month) or via the API. Free users typically access the smaller Haiku or Sonnet models.

How much does Claude Opus 4.5 cost for developers?

The API pricing is $5 per million input tokens and $25 per million output tokens, which is a 67% reduction compared to the previous Claude 3 Opus.

Is Claude Opus 4.5 better than GPT-5.1?

In coding and agentic benchmarks, Anthropic claims Opus 4.5 outperforms GPT-5.1, particularly in maintaining context over long tasks and correctly executing complex software engineering fixes.

What is the "Effort" parameter?

This is a unique feature that allows you to tell Claude how hard to "think." You can set it to "High" for complex analysis or "Low" to save money and get faster answers for simple tasks.

Claude Opus 4.5

One of the best model in the world for coding, agents, and computer use.

From Anthropic

Founder: Dario Amodei, Daniela Amodei, Jared Kaplan, Jack Clark, Ben Mann

Text Generator

24 Nov 2025

30 Million+

Paid

Pricing Model

Paid

Starting Price

$17/Month

About This AI

Claude Opus 4.5 is Anthropic’s flagship frontier model, released in late 2025 to set a new standard for AI reasoning and engineering.

Unlike its predecessors, which were often criticized for high costs, Opus 4.5 launched with a massive price reduction (67% cheaper) while delivering state-of-the-art performance in software development, complex agentic workflows, and “computer use”.

It is specifically designed to handle long-horizon tasks such as refactoring entire codebases or conducting deep research without losing context or hitting dead ends.

Chatbot Coding Conversation LLM

Pricing

Pricing Model

Paid

Starting Price

$17/Month

Key Features

Outperforms all competitor models on SWE-bench and other coding benchmarks, capable of managing multi-day development projects in hours.
Built to power autonomous agents that can execute complex, multi-step actions like "research and write a report" with high reliability.
Features advanced "computer use" capabilities, including a new zoom tool that allows the model to inspect specific screen regions for better UI navigation.
The only model that lets users control the "thinking" budget (Low, Medium, High) to balance thoroughness with speed and cost.
Supports a 200,000-token context window (approx. 500 pages) with "thinking block preservation" to maintain reasoning chains over long conversations.
Available directly within GitHub Copilot, Microsoft Foundry, and Vertex AI for seamless professional use.

Pros

Industry-leading performance for coding and software architecture.
Significantly cheaper ($5/$25 per million tokens) than previous Opus models.
"Effort" parameter gives users control over cost and depth.
Extremely resistant to "dead ends" in complex problem-solving.
Deep integration with major cloud and dev platforms.

Cons

Slower than the "Sonnet" and "Haiku" distinct models.
Still susceptible to prompt injection attacks (roughly 5% success rate).
Not optimized for creative multimodal tasks or high-frame-rate video.

Best for Software engineers, data scientists, and enterprise teams needing a reliable “senior engineer” AI for complex coding, refactoring, and deep research tasks.

FAQs

Is Claude Opus 4.5 free?
No, Opus 4.5 is a premium model available to Claude Pro and Team subscribers ($17/month) or via the API. Free users typically access the smaller Haiku or Sonnet models.
How much does Claude Opus 4.5 cost for developers?
The API pricing is $5 per million input tokens and $25 per million output tokens, which is a 67% reduction compared to the previous Claude 3 Opus.
Is Claude Opus 4.5 better than GPT-5.1?
In coding and agentic benchmarks, Anthropic claims Opus 4.5 outperforms GPT-5.1, particularly in maintaining context over long tasks and correctly executing complex software engineering fixes.
What is the “Effort” parameter?
This is a unique feature that allows you to tell Claude how hard to “think.” You can set it to “High” for complex analysis or “Low” to save money and get faster answers for simple tasks.