Claude Opus 4.5
✓ VerifiedAnthropic's most powerful AI model with state-of-the-art coding and agentic capabilities
About
Claude Opus 4.5 is Anthropic's flagship AI model, released November 24, 2025. It delivers state-of-the-art performance on coding benchmarks, leading SWE-bench Verified and outperforming all frontier models. With the new effort parameter, developers can customize the balance between speed and capability. The model features context compaction for longer-running agentic sessions, using up to 65% fewer tokens for long-horizon coding tasks. Opus 4.5 is the most robustly aligned model to date, with industry-leading resistance to prompt injection attacks.
Key Features
- ✓SWE-bench Verified leader - best coding benchmark
- ✓10.6% improvement over Sonnet 4.5 on Aider Polyglot
- ✓Effort parameter for speed vs capability tradeoff
- ✓Context compaction for long-running agents
- ✓65% fewer tokens for long-horizon coding tasks
- ✓30-minute autonomous coding sessions
- ✓29% higher performance than Sonnet 4.5 on Vending-Bench
- ✓Industry-leading prompt injection resistance
- ✓Most robustly aligned model to date
- ✓50-75% reduction in tool-calling errors
Use Cases
- →Complex multi-file refactoring
- →Long-running autonomous coding sessions
- →Deep debugging and code analysis
- →Agentic workflows and automation
- →Enterprise AI applications
- →Multi-step reasoning and planning
- →Code review and optimization
Technical Details
Languages
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Integrations
Frequently Asked Questions
What is Claude Opus 4.5?
Claude Opus 4.5 is Anthropic's flagship AI model, released November 24, 2025. It delivers state-of-the-art performance on coding benchmarks, leading SWE-bench Verified and outperforming all frontier models. With the new effort parameter, developers can customize the balance between speed and capability. The model features context compaction for longer-running agentic sessions, using up to 65% fewer tokens for long-horizon coding tasks. Opus 4.5 is the most robustly aligned model to date, with industry-leading resistance to prompt injection attacks.
How much does Claude Opus 4.5 cost?
Claude Opus 4.5 offers pay-per-use pricing. Plans include: API Access: Pay per token.
What programming languages does Claude Opus 4.5 support?
Claude Opus 4.5 supports 10+ programming languages including Python, TypeScript, JavaScript, Java, C++, Go, Rust, Ruby, PHP, All major languages.
What AI models does Claude Opus 4.5 use?
Claude Opus 4.5 is powered by Claude Opus 4.5.
What platforms does Claude Opus 4.5 support?
Claude Opus 4.5 is available on Web, All platforms via API.
What can Claude Opus 4.5 do?
Claude Opus 4.5 provides code completion, code generation, debugging, AI chat, agentic/autonomous mode. Key features include: SWE-bench Verified leader - best coding benchmark, 10.6% improvement over Sonnet 4.5 on Aider Polyglot, Effort parameter for speed vs capability tradeoff.
Related Articles
How to Use Claude Opus 4.5: Complete Developer Guide
A practical guide to using Claude Opus 4.5 for coding. Learn about the effort parameter, context compaction, API setup, and best practices for getting the most out of Anthropic's flagship model.
Claude Opus 4.5 vs GPT-5.1-Codex-Max vs Gemini 3 Pro: 2025 AI Coding Showdown
An in-depth comparison of the three most powerful AI coding models of November 2025: Claude Opus 4.5, GPT-5.1-Codex-Max, and Gemini 3 Pro. Benchmarks, pricing, features, and recommendations.
Claude Opus 4.5 Released: Anthropic's Most Powerful Coding AI Yet
Anthropic releases Claude Opus 4.5, their flagship AI model with state-of-the-art coding performance. Learn about the effort parameter, context compaction, benchmark results, and pricing.
Pricing
API Access
Pay per token- •State-of-the-art coding performance
- •200K+ context window
- •Effort parameter (speed vs capability)
- •Context compaction for agents
- •Vision capabilities
- •Tool use and function calling
Company
- Name
- Anthropic
- Founded
- 2021
- Location
- San Francisco, CA
- Users
- Millions of API calls daily
Links
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