Anthropic: Claude Sonnet 4.5
Analysis Summary
Anthropic: Claude Sonnet 4.5 sits in the Professional tier on our leaderboard, ranked #36 of 525 published models on overall intelligence. At $3.00 input and $15.00 output per 1M tokens, it is among the most expensive on the market. It offers an exceptionally large context window suited to long-document workflows and supports tool use, function calling, vision, and reasoning.
Editorial notes
Claude Sonnet 4.5 from Anthropic delivers strong instruction following, vision support, tool use, and a 1M token context window, making it well-suited for client-facing content and agentic workflows at a mid-range price point.
Assessed April 26, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
Claude Sonnet 4.5 is Anthropicās 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..
Capabilities
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does Anthropic: Claude Sonnet 4.5 stack up?
Compare side-by-side with other professional models.
Model Information
| OpenRouter ID |
anthropic/claude-sonnet-4.5
|
| Provider | anthropic |
| Release Date | September 29, 2025 |
| Context Length | 1,000,000 tokens |
| Max Completion | 64,000 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $3.00 | $0.003000 |
| Output | $15.00 | $0.015000 |
Live Performance
Live endpoint metrics ā refreshed every 30 minutes.
