TLDR
- Anthropic deployed Claude Opus 4.5 on November 24, 2025, with enhanced coding and enterprise capabilities
- The AI model surpassed all human applicants on Anthropic’s internal performance engineering assessment
- Claude Opus 4.5 leads SWE-bench Verified rankings above competing models from Google and OpenAI
- Desktop integration for Claude Code enables parallel session management for development workflows
- The launch comes after recent investments valued Anthropic at roughly $350 billion
Anthropic introduced Claude Opus 4.5 this week, marking the company’s third major model release since September. The AI startup previously launched Claude Sonnet 4.5 and Claude Haiku 4.5 in recent months.
The company was established in 2021 by researchers who left OpenAI. Microsoft and Nvidia recently committed multi-billion-dollar investments that brought Anthropic’s valuation to around $350 billion.
Claude Opus 4.5 focuses on software engineering, computer automation, and complex business workflows. The model serves developers, financial professionals, and knowledge workers requiring AI tools for technical projects.
Benchmark Results and Human Comparison
Anthropic administered its standard performance engineering exam to Claude Opus 4.5. This assessment evaluates technical skills and problem-solving under time constraints. The model completed the two-hour test with a score exceeding every human candidate the company has interviewed.
The AI achieved top rankings on SWE-bench Verified, a standardized evaluation measuring software development abilities. Claude Opus 4.5 scored higher than Google’s Gemini 3 Pro and OpenAI’s GPT-5.1 on these tests.
Company employees who tested the model before launch reported similar experiences. Users noted the AI handles ambiguous instructions and resolves multi-system technical issues without detailed guidance.
During evaluation, Claude Opus 4.5 demonstrated creative problem-solving on the τ2-bench assessment. In one scenario testing airline service agent capabilities, the model found an approved workaround by upgrading ticket classes before modifying flights. The benchmark initially marked this approach as incorrect because the solution was unexpected.
Platform Updates and Integration
Claude Opus 4.5 includes a new effort parameter through the API. This setting allows developers to optimize for either processing speed or maximum capability. At medium effort levels, the model matches previous performance benchmarks while consuming 76% fewer output tokens.
The company enhanced security features for this release. Claude Opus 4.5 shows increased resistance to prompt injection attacks based on testing by Gray Swan. These attacks use hidden instructions to manipulate AI behavior.
Anthropic released Claude Code for desktop applications alongside the model launch. This tool supports multiple concurrent coding sessions running locally or remotely. The updated Plan Mode feature asks clarifying questions before generating editable execution plans.
Access and Implementation
Claude Opus 4.5 is available through the Claude API, mobile apps, and three major cloud providers. Developers access the model using the string claude-opus-4-5-20251101. Input tokens are priced at $5 per million and output tokens at $25 per million.
The model serves as the default option across Anthropic’s Pro, Max, and Enterprise subscription tiers. The company eliminated usage caps previously applied to Opus-level models for qualifying users.
Claude for Chrome reached all Max subscribers with the latest update. This browser extension executes tasks across multiple active tabs. Claude for Excel expanded to general availability for Max, Team, and Enterprise accounts.
The platform now supports extended conversations without message limits. The system compresses earlier dialogue automatically to maintain context in long-running sessions. Max and Team Premium users received increased overall usage limits to accommodate daily Opus 4.5 workflows.
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