Vercel AI Gateway
Coverage
Claude Sonnet 4.6 brings improved coding performance, expanded developer tools, enhanced API capabilities, and updated safety evaluations.
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Model details
Claude Sonnet 4.5
Claude Sonnet 4.5 is designed as a high-performance model optimized for coding, computer-use tasks, and the orchestration of complex agents. Built upon a hybrid reasoning architecture, the model allows users to toggle between a standard, low-latency mode for routine queries and an extended reasoning mode for tackling intricate, multi-step problems. This design intent focuses on providing a robust tool for modern software development and automated workflows, where the model can effectively navigate technical environments, manage file creation, and execute code to solve real-world challenges.
The model benefits from a lineage that builds on the foundational strengths of the Claude 4 and Opus 4.1 series, incorporating significant advancements in reasoning and math capabilities. It has been deployed under rigorous safety protocols, including AI Safety Level the listed price protections, following comprehensive testing across cybersecurity and misuse scenarios. Beyond its core performance, the model supports advanced developer features such as persistent memory and context editing, which enable agents to maintain coherence over longer, more complex interactions. These capabilities, combined with its top-tier performance on benchmarks like SWE-Bench Verified, position it as a versatile asset for developers building autonomous systems.
Vercel AI Gatewayanthropic/claude-sonnet-4.5claude-sonnet
Quick Info
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- Vercel AI Gateway
- Model key
- anthropic/claude-sonnet-4.5
- Release date
- Sep 29, 2025
- Last updated
- Sep 29, 2025
- Knowledge cutoff
- 2025-07-31
- Input modalities
- Output modalities
- Capabilities
Cost
- Input token cost
- $3.00
- Output token cost
- $15.00
Limits
- Output tokens
- 64,000 tokens
- Context window
- 1,000,000 tokens
Transparent token rates
Compare Claude Sonnet 4.5 pricing
Rates are shown per one million tokens. Combined means one million input plus one million output tokens.
Latest news about Claude Sonnet 4.5
Vercel AI Gateway
Coverage
Anthropic has announced the launch of Claude Sonnet 4.6, boasting significant performance and cost improvements.
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