The model also shows improved capabilities on a broad range of evaluations including reasoning and math: Claude Sonnet 4.5 is our most powerful model to date.

September 29, 2025 - This new model builds upon Claude 4’s foundation to achieve state-of-the-art performance in coding and complex agentic applications. Claude Sonnet 4.5 demonstrates advancements in agent capabilities, with enhanced performance in tool handling, ...

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. Run Claude Sonnet 4.5 with API

Sonnet 4.5 excels in computer use capabilities, reliably handling any browser-based task from competitive analysis to procurement workflows to customer onboarding. Sonnet 3.5 was the first frontier AI model to be able to use computers in this way.

Claude Sonnet 4.5 is our best model for building complex agents that can work independently for extended periods. It advances the frontier in coding capabilities, achieves state-of-the-art performance in computer use, and excels at powering ...

As our Anthropic colleagues tested the model before release, we heard remarkably consistent feedback. Testers noted that Claude Opus 4.5 handles ambiguity and reasons about tradeoffs without hand-holding. They told us that, when pointed at a complex, multi-system bug, Opus 4.5 figures out the fix.

6 days ago - Claude Sonnet 4.5 is Anthropic's most intelligent model and its best performing for building complex agents, delivering leading coding capabilities and executing across development tasks while maintaining the optimal balance of speed and cost for production environments.

3 days ago - Anthropic announced Sonnet 4.5 on September 29, 2025, presenting it as the company's most capable model at the time for coding, agents, and computer use. Pricing stayed at $3 per million input tokens and $15 per million output tokens. On SWE-bench Verified, Anthropic reported a 77.2% score ...

Anthropic's mid-sized model for powering real-world agents, with capabilities in coding, computer use, cybersecurity, and working with office files like spreadsheets. ... Except as otherwise noted, the content of this page is licensed under ...

September 29, 2025 - We’re thrilled to announce the rollout of Claude Sonnet 4.5, Anthropic’s latest and most capable coding model. Starting today, Sonnet 4.5 is the default model for Augment Code, and will appear alongside GPT-5 in the model picker.

Claude Sonnet 4.5 represents a major leap forward in AI capability and alignment. It is the most advanced model released by Anthropic to date, distinguished by dramatic improvements in reasoning, mathematics, and real-world coding. Supports 1m tokens of context.

October 7, 2025 - You can invoke it via the API model name claude-sonnet-4-5 at the same token pricing as before ([2]). Claude Code 2.0 is rolling out with these features: updating the CLI tool (install or npm update claude) and the VS Code extension (beta) from ...

September 29, 2025 - The model is better at coding, ... said. The Amazon-backed startup, which is valued at $183 billion, is making Claude Sonnet 4.5 available to all users....

If you're unsure which model to use, we recommend starting with Claude Sonnet 4.5.

Claude Sonnet 4.5 is Anthropic's most capable model to date for building real-world agents and handling complex, long-horizon tasks, balancing the right speed and cost for high-volume use cases.

September 30, 2025 - Today, we’re announcing the general availability of Claude Sonnet 4.5, Anthropic’s most intelligent model and its best-performing model for complex agents, coding, and computer use, on Vertex AI.

Claude Opus 4.5: Our most intelligent model combining maximum capability with practical performance. Features a more accessible price point than previous Opus models. Available with a 200k token context window.

Claude Opus 4.5 is Anthropic's most powerful model, which sets a new standard across coding, agents, computer use, and office tasks—outperforming both Sonnet 4.5 and Opus 4.1 while making Opus-level intelligence accessible at one-third the cost.