Claude Sonnet 4.5

Claude Sonnet 4.5 is engineered as a highly capable model focused on complex agentic tasks, autonomous software development, and advanced reasoning. It is designed to operate independently over extended periods, allowing it to orchestrate multiple tools and coordinate agentic workflows to solve intricate, multi-step problems. By prioritizing deep domain knowledge in areas such as coding, finance, research, and cybersecurity, the architecture supports long-horizon planning and execution, making it a robust choice for users who need to automate sophisticated processes that span hours or even days.

The model demonstrates significant advancements in reasoning and mathematical proficiency, building on a lineage that emphasizes practical utility in real-world environments. Its design enables it to handle complex context management and tool integration, which facilitates proactive defense in cybersecurity or continuous monitoring in financial compliance. By supporting autonomous file creation and long-running task execution, the model is well-positioned for professional research and development workflows where it can deliver actionable insights and ready-to-use deliverables, effectively shifting from reactive assistance to proactive, autonomous problem-solving.

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Quick Info

Provider: Venice AI
Model key: claude-sonnet-4-5
Release date: Jan 15, 2025
Last updated: Jun 11, 2026
Knowledge cutoff: 2025-07-31
Input modalities
Output modalities
Capabilities

Cost

Input token cost: $3.75
Output token cost: $18.75

Limits

Output tokens: 64,000 tokens
Context window: 198,000 tokens

Transparent token rates

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Rates are shown per one million tokens. Combined means one million input plus one million output tokens.

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Latest news about Claude Sonnet 4.5

Venice AI

Coverage

MiMo V2 Pro outperforms DeepSeek and Claude Sonnet, available free via MiMo Chat and the autonomous MiMo Claw agent., “Xiaomi has launched a flagship AI model

Venice AI

Coverage

Claude Sonnet 4.6 brings improved coding performance, expanded developer tools, enhanced API capabilities, and updated safety evaluations.

Venice AI

CoverageBenchmark

CodeRabbit's benchmark evaluation compared Claude Sonnet 4.5 against Sonnet 4 and Opus 4.1 across 25 difficult real-world pull requests with known critical bugs. Sonnet 4.5 achieved 41.5% "Important" comments versus 35.3% for Sonnet 4, demonstrating measurable progress in catching bugs and surfacing critical issues inc The evaluation found Sonnet 4.5 approaches Opus 4.1's coverage and precision at a fraction of the price, making it a pragmatic sweet spot for code review at scale. However, the model showed more hedging and self-questioning behavior, sometimes sounding like "a thoughtful colleague rather than a decisive reviewer." This

Venice AI

CoverageBenchmark

Cirra AI's technical analysis confirms Claude Sonnet 4.5 was released September 29, 2025, with a 200,000-token context window and up to 64K output tokens. The model uses a hybrid reasoning architecture with an "extended thinking" mode for multi-step tasks, enabling more sophisticated agentic workflows. Anthropic positi New API-side tools shipped alongside Sonnet 4.5 include context editing, memory, checkpoints, and VS Code integration to support long-running agentic workflows. The model demonstrated autonomous operation spanning 30+ hours on complex tasks. These capabilities reflect Anthropic's focus on making Sonnet 4.5 suitable for