Claude Sonnet 4.5, released by Anthropic in September 2025, is the company’s most advanced Sonnet-series model, built for high-performance reasoning, coding, and long-horizon agentic workflows. It is a multimodal system that accepts both text and images, with a 200,000-token context window designed for handling large documents and extended interactions. Anthropic highlights its improvements in reliability, reduced sycophancy, and alignment, making it suitable for sustained enterprise use.
The model delivers strong results in coding and autonomous workflows, achieving 61.4% on the OSWorld benchmark and leading performance on SWE-bench Verified. It introduces infrastructure features such as a memory tool (beta), checkpointing for Claude Code, parallel tool use, and tighter integration with VS Code. Compared to Opus, which targets broader reasoning, Sonnet 4.5 is optimized for structured, long-duration tasks. Positioned against leading offerings from OpenAI and Google, it is aimed at enterprise automation, software engineering, and research-intensive applications.
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Usage
Past 30 Days| Category | Passed | Score |
|---|---|---|
| Document Understanding | 7 / 9 | 77.8% |
| Defect Detection | 11 / 15 | 73.3% |
| Object Understanding | 9 / 14 | 64.3% |
| Spatial Understanding | 12 / 19 | 63.2% |
| Object Counting | 1 / 10 | 10% |
| Category | Passed | Score |
|---|---|---|
| VQA & Extraction | 45 / 60 | 75% |
| Focused Scene OCR | 71 / 99 | 71.7% |
| Text Recognition | 20 / 30 | 66.7% |
| License Plate Recognition | 16 / 30 | 53.3% |
| Handwritten Math | 2 / 10 | 20% |
Scores based on a single evaluation run · Methodology
View all Vision Evals →Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens.
Pricing updated Jul 9, 2026
Estimated cost per task vs. Visual Understanding score, for this model and others ranked near it. Upper-left is the sweet spot (high quality, low cost).
11 of 11 models plotted
| Model | Score | Median tokens | Est. cost / task | Compare |
|---|---|---|---|---|
| Claude Opus 4.7 | 67.2% | 2.6K | $0.015 | Compare |
| Gemma 4 31B | 67.2% | 467 | $0.0001 | Compare |
| Claude Opus 4.6 | 64.2% | 2.3K | $0.014 | Compare |
| GPT-5.4 Nano | 62.7% | 1.8K | $0.0004 | Compare |
| Llama 4 Maverick | 59.7% | 2.4K | $0.0004 | Compare |
| Claude Sonnet 4.5(this model) | 59.7% | 2.3K | $0.0092 | — |
| Claude Opus 4.1 | 59.7% | 2.1K | $0.040 | Compare |
| Claude Haiku 4.5 | 58.2% | 2.3K | $0.0030 | Compare |
| GPT-5 Nano | 58.2% | 2.7K | $0.0003 | Compare |
| Qwen3.5 397B A17B | 58.2% | 1.5K | $0.0006 | Compare |
| Gemini 2.5 Flash | 55.2% | 476 | $0.0005 | Compare |
Other models worth comparing for similar use cases.
Other versions in the same family as Claude Sonnet 4.5.
License terms and commercial-use guidance for Claude Sonnet 4.5.
License information is provided as a guide and is not legal advice.