Claude Opus 4.5
✓Anthropic's most powerful AI model with state-of-the-art coding and agentic capabilities
AI Model
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.
Pay-per-use
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
WebAll platforms via API
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