Claude Opus 4.5 is Anthropic’s flagship AI model, released on November 24, 2025. Officially positioned as “the best model in the world for coding, agents, and computer use,” Opus 4.5 represents the pinnacle of the Claude 4.5 family. It delivers breakthrough performance in software engineering, enterprise workflows, and long-horizon autonomous tasks—while dramatically reducing costs compared to previous Opus models.

Claude Opus 4.5 Core Specifications

Here are the key technical specifications for Claude Opus 4.5:

SpecificationValue
Context Window200,000 tokens
Max Output64,000 tokens
Knowledge CutoffMarch 2025
API Identifierclaude-opus-4-5-20251101
Input Pricing$5 / million tokens
Output Pricing$25 / million tokens

Compared to Opus 4.1’s $15/$75 pricing, Opus 4.5 represents a 67% cost reduction, making top-tier AI capabilities more accessible than ever.

Key Capabilities of Claude Opus 4.5

Coding and Software Engineering

Claude Opus 4.5 achieves an industry-leading 80.9% on the SWE-bench Verified benchmark, outperforming Google Gemini 3 Pro (76.2%) and OpenAI GPT-5.1-Codex-Max (77.9%). The model handles ambiguity like a senior engineer, autonomously analyzing and resolving complex bugs across multiple systems.

For developers who embrace Vibe Coding, Opus 4.5 paired with Claude Code can complete multi-day projects in hours, building more precise execution plans along the way.

AI Agents and Automated Workflows

In the AI Agent domain, Opus 4.5 demonstrates exceptional long-horizon task handling. According to Anthropic’s testing, Opus 4.5 agents reach peak performance in just 4 iterations, while competing models couldn’t match that quality after 10. These agents can also learn from experience, storing insights to apply to future tasks.

On the OSWorld computer-use benchmark, the Claude 4.5 family achieves 66.3%, making it the strongest “Computer Use” model available—capable of operating desktop environments, launching applications, and handling file manipulation GUI workflows.

Enterprise Document Processing

Opus 4.5 shows significant improvements in creating spreadsheets, presentations, and documents while maintaining context consistency across files. In Excel automation and financial modeling specifically, Fundamental Research Labs testing showed 20% accuracy improvement and 15% efficiency gains.

Exclusive Claude Opus 4.5 Features

Effort Parameter

Opus 4.5 is the only model that supports the effort parameter, allowing developers to set low, medium, or high levels via the API to balance performance and cost:

  • Medium Level: Matches Sonnet 4.5’s SWE-bench score while using 76% fewer output tokens
  • High Level: Exceeds Sonnet 4.5 by 4.3 percentage points while using 48% fewer tokens

Hybrid Reasoning

Opus 4.5 combines instant responses with extended thinking modes, automatically preserving all thinking blocks across multi-turn conversations to maintain reasoning continuity. This is particularly crucial for complex, long-running tasks.

Infinite Chat

Paid users no longer encounter conversation length limits—Opus 4.5 maintains context memory and consistency even in extremely long conversations.

Claude Opus 4.5 vs Competitors

Comparison with Claude Sonnet 4.5

ComparisonOpus 4.5Sonnet 4.5
SWE-bench80.9%76.6%
Pricing (Input/Output)$5/$25$3/$15
Effort Parameter✓✗
PositioningTop-tier complex tasksEveryday coding

Comparison with Gemini 3

Claude Opus 4.5 leads Gemini 3 Pro on coding benchmarks, but on GPQA Diamond (PhD-level science questions), Gemini 3 Pro edges ahead with scores in the low 90s. On the MMLU general knowledge test, both achieve approximately 90%, with minimal difference.

Comparison with GPT-5

Opus 4.5 outperforms GPT-5.1-Codex-Max on SWE-bench (80.9% vs 77.9%), but OpenAI offers lower pricing ($1.25/$10). The choice depends on your use case: choose Opus 4.5 for maximum coding capability, or consider GPT-5.1 for cost efficiency.

Claude Opus 4.5 Pricing and Cost Savings

Standard API Pricing

  • Input: $5 / million tokens
  • Output: $25 / million tokens

Cost-Saving Strategies

  1. Batch Processing: Get 50% off with batch processing—input drops to $2.50, output to $12.50
  2. Prompt Caching: Save up to 90% on repeated prompts—writes cost $6.25/million, reads just $0.50/million
  3. Effort Adjustment: Using medium effort significantly reduces token consumption

Subscription Plans

Opus 4.5 is included in the following Claude subscription plans:

  • Claude Pro ($20/month)
  • Claude Max
  • Claude Team
  • Claude Enterprise

How to Access Claude Opus 4.5

Via Claude.ai Web Interface

All Pro, Max, Team, and Enterprise users can select the Opus 4.5 model directly on Claude.ai.

Via API

import anthropic

client = anthropic.Anthropic()

message = client.messages.create(

    model=”claude-opus-4-5-20251101″,

    max_tokens=1024,

    messages=[

        {“role”: “user”, “content”: “Hello, please analyze this code for me”}

    ]

)

Via Cloud Platforms

Opus 4.5 is also available on:

Who Should Use Claude Opus 4.5?

According to Anthropic’s official recommendations, the following users will get the most value from Opus 4.5:

  1. Professional Software Developers: Those handling complex code refactoring and cross-system debugging
  2. Financial Analysts: Those performing financial modeling, predictive analysis, and spreadsheet automation
  3. Consultants and Accountants: Those processing large-scale document analysis and report generation
  4. Enterprise Automation Teams: Those building long-horizon AI Agent workflows

If your tasks are relatively straightforward, Claude Sonnet 4.5 may be a more cost-effective choice.

Security and Prompt Injection Protection

Opus 4.5 shows significant improvements in resistance to prompt injection attacks, making it the hardest-to-trick frontier model in the industry. According to Anthropic’s testing, single-attempt attack success rates are approximately 5%, but if attackers try 10 different attack methods, the success rate rises to around 33%.

Conclusion

Claude Opus 4.5 represents the optimal balance between AI model practicality and accessibility. It not only leads the industry in coding and agent tasks but also makes top-tier AI capabilities available to more developers and enterprises through dramatically reduced pricing.

For professionals handling complex software engineering, long-horizon automation tasks, or enterprise-level document processing, Opus 4.5 is the most compelling option on the market today.

Further Reading:

Official Resources: