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Anthropic: Claude Sonnet 4.5

Claude Sonnet 4.5 Overview

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.

Claude Sonnet 4.5 Interactive Demo

Claude Sonnet 4.5 Details & Performance

Details

Resources

Vision Tasks

Vision LanguageObject DetectionClassificationOCRVisual Question AnsweringCaptioning

Features

Foundation VisionLLMs with Vision CapabilitiesMultimodal Vision

Usage

Past 30 Days

Performance

Avg. Latency

Arena Rankings

Claude Sonnet 4.5 Vision Evals

Visual Understanding

74 models · 67 tasks
HighestLowest
This model#43 of 7459.7% pass rate · better than 36%
Score59.7%pass rate across 67 tasks
Speed5.67savg response per task
Cost$0.0092 / task$3.00 in · $15.00 out / 1M
Tokens2.3K / task2.2K in · 182 out
Score key:≥75%40–74%<40%
CategoryPassedScore
Document Understanding7 / 9
77.8%
Defect Detection11 / 15
73.3%
Object Understanding9 / 14
64.3%
Spatial Understanding12 / 19
63.2%
Object Counting1 / 10
10%
HighestLowest
This model#40 of 5567.25% pass rate · better than 27%
Score67.25%pass rate across 229 tasks
Speed3.93savg response per task
Cost$0.0039 / task$3.00 in · $15.00 out / 1M
Tokens866 / task735 in · 115 out
Score key:≥75%40–74%<40%
CategoryPassedScore
VQA & Extraction45 / 60
75%
Focused Scene OCR71 / 99
71.7%
Text Recognition20 / 30
66.7%
License Plate Recognition16 / 30
53.3%
Handwritten Math2 / 10
20%

Scores based on a single evaluation run · Methodology

View all Vision Evals →

Claude Sonnet 4.5 Pricing

Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens.

Input$3.00 / 1M tokens
Output$15.00 / 1M tokens
Cached input$0.300 / 1M tokens

Pricing updated Jul 9, 2026

Price vs. performance

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

ModelScoreMedian tokensEst. cost / taskCompare
AnthropicClaude Opus 4.767.2%2.6K$0.015Compare
GoogleGemma 4 31B67.2%467$0.0001Compare
AnthropicClaude Opus 4.6 64.2%2.3K$0.014Compare
OpenAIGPT-5.4 Nano62.7%1.8K$0.0004Compare
MetaLlama 4 Maverick59.7%2.4K$0.0004Compare
AnthropicClaude Sonnet 4.5(this model)59.7%2.3K$0.0092
AnthropicClaude Opus 4.159.7%2.1K$0.040Compare
AnthropicClaude Haiku 4.558.2%2.3K$0.0030Compare
OpenAIGPT-5 Nano58.2%2.7K$0.0003Compare
QwenQwen3.5 397B A17B58.2%1.5K$0.0006Compare
GoogleGemini 2.5 Flash55.2%476$0.0005Compare

Alternatives to Claude Sonnet 4.5

Other models worth comparing for similar use cases.

OpenAI
GPT-5 Mini
GPT-5 Mini, released by OpenAI on August 7, 2025, is a mid-tier variant of the GPT-5 family that balances cost, speed, and capability. It is multimodal, supporting both text and image inputs, and offers a substantial input context window of ~400,000 tokens with output lengths up to ~128,000 tokens. While less powerful than the full GPT-5, it inherits its safety tuning, instruction-following improvements, and multimodal reasoning, making it a practical choice for developers who need large context handling without the expense of premium models.GPT-5 Mini is optimized for affordability while retaining strong reasoning performance. Benchmarks show it outperforming earlier models such as GPT-4o on many multimodal and medical VQA tasks, though it lags behind GPT-5 on the most complex problems. Ideal use cases include prototyping, scalable content generation, document analysis, and mid-range reasoning tasks where efficiency and context capacity matter more than top-tier accuracy.
Google
Gemini 2.5 Flash
Gemini 2.5 Flash, released on June 17, 2025, is Google DeepMind’s production-ready, efficiency-focused model in the Gemini 2.5 family. It is multimodal, accepting text, images, video, and audio as inputs, with text as the primary output format. The model supports 1 million input tokens and up to 65K output tokens, enabling it to process very large contexts such as books, long video transcripts, or extensive datasets. Its training knowledge extends to January 2025.Designed as a price-performance leader, Gemini 2.5 Flash balances speed and reasoning power, making it suitable for everyday enterprise and developer use cases without the higher latency and cost of Pro models. It supports advanced workflows like function calling, code execution, search grounding, URL context ingestion, and structured outputs. While efficient and scalable, output length is still limited compared to its input capacity, and multimodal outputs (e.g. image or audio generation) remain restricted to specialized or preview variants.
Google
Gemini 3.5 Flash
Gemini 3.5 Flash is a multimodal language model developed by Google DeepMind and released at Google I/O 2026. It is built on the Gemini 3 Flash reasoning foundation and introduces configurable thinking levels (minimal, low, medium, and high) that allow developers to tune the depth of internal reasoning before a response is generated. The model accepts text, image, video, audio, and PDF inputs and produces text output, with a 1 million token context window and up to 65,000 output tokens per request. It is natively multimodal, processing visual inputs alongside text to support tasks such as image captioning, classification, optical character recognition, object detection, and visual grounding, where the model references specific regions within an image or video frame.Its vision capabilities extend to interpreting UI screenshots, diagrams, charts, and real-world scenes, as well as understanding video and live frame sequences for activity and scene recognition. The model supports combined tool use, including Google Search, URL context, code execution, and custom functions, within a single request, and it uses reasoning context from previous turns when thought signatures are present in the conversation history, enabling persistent multi-turn reasoning chains. Gemini 3.5 Flash carries a knowledge cutoff of January 2026 and is available via the Gemini API, Google AI Studio, Google Antigravity, and the Gemini Enterprise Agent Platform.
Qwen
Qwen3.6 35B A3B
Qwen3.6-35B-A3B is a sparse Mixture-of-Experts (MoE) multimodal language model developed by the Qwen team at Alibaba Group. It carries 35 billion total parameters but activates only approximately 3 billion per forward pass via a learned routing mechanism, giving it the representational capacity of a large dense model at a fraction of the inference compute. The model is natively multimodal, processing images, documents, and video alongside text as a core architectural capability rather than an add-on. It supports a native context window of 262,144 tokens, extensible up to 1,010,000 tokens via YaRN. A key design feature is the unified thinking/non-thinking mode framework: users can switch between deliberate chain-of-thought reasoning and fast direct responses within a single model, and a "thinking preservation" option retains reasoning context across multi-turn agentic workflows to reduce redundant computation.The model is specifically optimized for agentic coding tasks, including repository-level reasoning, frontend workflow generation, multi-step tool use, and MCP (Model Context Protocol) integration. On SWE-bench Verified it scores 73.4%, on Terminal-Bench 2.0 it scores 51.5%, and on MCPMark it scores 37.0%. For vision-language tasks it achieves 92.0 on RefCOCO, 89.9 on OmniDocBench 1.5, and 83.7 on VideoMMMU. The model also supports Multi-Token Prediction (MTP) for speculative decoding. All Qwen3.6 open-weight models are released under the Apache 2.0 license.

Other Anthropic Sonnet models

Other versions in the same family as Claude Sonnet 4.5.

Claude Sonnet 4.5 License

Proprietary

License terms and commercial-use guidance for Claude Sonnet 4.5.

License information is provided as a guide and is not legal advice.