Claude Sonnet 4.5
About this model
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.
Performance Tier
Claude Sonnet 4.5 is a balanced model from Claude : strong performance at a reasonable price.
Strong cost-performance ratio. Reliable for most professional use cases without premium pricing.
Pricing
This model is included in Elosia plans| Type | per 1M tokens |
|---|---|
| Input (prompt) | $3.00 |
| Output (completion) | $15.00 |
| Cache read | $0.300 |
| Cache write | $3.75 |
Capabilities
Benchmarks
Recommended Use Cases
Strengths
- Best balance of speed and intelligence in the Claude family
- Extended thinking mode for complex reasoning tasks
- Strong code generation with SWE-bench 70.3%
- Excellent creative writing and nuanced communication
Limitations
- Extended thinking adds latency for complex queries
- Less capable than Opus on graduate-level science reasoning
Resources
This model may use your data for training