Claude Sonnet 4.5

Claude Sonnet 4.5 by Anthropic excels in the Coding category, where it ranks #10 with a composite score of 69/100. Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across system design, code security, and specification adherence. The model is designed for extended autonomous operation, maintaining task continuity across sessions and providing fact-based progress tracking. Sonnet 4.5 also introduces stronger agentic capabilities, including improved tool orchestration, speculative parallel execution, and more efficient context and memory management. With enhanced context tracking and awareness of token usage across tool calls, it is particularly well-suited for multi-context and long-running workflows. Use cases span software engineering, cybersecurity, financial analysis, research agents, and other domains requiring sustained reasoning and tool use. It is particularly strong in areas highlighted by its top benchmark performance and adoption metrics, making it suitable for both individual developers and enterprise teams looking for a reliable coding solution.

Claude Sonnet 4.5 is priced at $3.00 per million input tokens and $15.00 per million output tokens (USD). Contact the provider for volume discounts and enterprise pricing. Pricing is competitive within the coding category and reflects the model's quality-to-cost ratio.

In the Coding category, Claude Sonnet 4.5 holds rank #10 out of 6 models tracked. Its quality rank is #10 and adoption rank is #10. You can use our comparison tool at /compare to see detailed side-by-side metrics with specific alternatives. Key differentiators include its composite scoring across benchmarks, community sentiment, and real-world adoption rates.

Claude Sonnet 4.5 has been evaluated across 6 different signals. Its strongest areas include Capabilities (86/100), Context Window (95/100), Output Capacity (80/100). These scores are derived from industry-standard benchmarks, community ratings, and real-world performance metrics. The composite score of 69/100 reflects a weighted combination of all tracked signals.

Claude Sonnet 4.5 is a paid model, though some providers may offer trial credits or limited free tiers for evaluation. Check Anthropic's website for current free tier availability and promotional offers.