Anthropic
anthropic.com › news › claude-sonnet-4-5
Introducing Claude Sonnet 4.5
September 29, 2025 - Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers.
Claude
claude.ai
Claude
Talk with Claude, an AI assistant from Anthropic
Claude 4.5 Sonnet is here
Am I tripping or is this actually a pretty nice upgrade More on reddit.com
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September 29, 2025Sonnet 4.5 is available now!
I’m giving it a chance, so far pleasantly surprised. Thank you anthropic - if it continues being good I might restart my sub More on reddit.com
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September 29, 2025Claude 4.5 Sonnet: lots of hype, middling ranks. What gives?
For me, it's implementing and making less mistakes and not scope creeping, and generally doing everything correct without me stepping in. And that's more valuable than any other model I've used so far. Codex has been good but I feel a little closed-off. You set it and forget it, and come back to see what's happened. You can do that twice then it says come back in a week. Claude 4.5 has been more productive, more communicative, and more collaborative, with less limits. I like it. More on reddit.com
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October 3, 2025What's new in Claude Sonnet 4.5
I never doubted him. Lisan al-Gaib... More on reddit.com
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September 29, 2025Videos
11:13
Claude Sonnet 4.5 - The New Coding King? (Sonnet 4.5 vs. GPT 5 ...
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Sonnet 4.5 is the best coding model in the world - YouTube
06:57
Claude Sonnet 4.5: My Worst Experience Story - YouTube
r/GithubCopilot on Reddit: Claude Sonnet 4's 1M Context Window ...
Anthropic
anthropic.com › claude › sonnet
Claude Sonnet 4.5
September 29, 2025 - Claude Sonnet 4.5 amplifies GitHub Copilot's core strengths. Our initial evals show significant improvements in multi-step reasoning and code comprehension—enabling Copilot's agentic experiences to handle complex, codebase-spanning tasks better.
Reddit
reddit.com › r/singularity › claude 4.5 sonnet is here
r/singularity on Reddit: Claude 4.5 Sonnet is here
September 29, 2025 -
https://www.anthropic.com/news/claude-sonnet-4-5
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Enhanced tool usage: The model more effectively uses parallel tool calls, firing off multiple speculative searches simultaneously during research and reading several files at once to build context faster. Improved coordination across multiple tools and information sources enables the model to effectively leverage a wide range of capabilities in agentic search and coding workflows. three weeks ago amidst all the claude inference issues, i made a comment about sonnet feeling way faster like it was doing parallel tool calls , now i'm thinking i was A/B tested on. i'd never seen sonnet perform that well before
Poe
poe.com › Claude-Sonnet-4.5
Claude-Sonnet-4.5 - Poe
September 29, 2025 - 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.
AWS
aws.amazon.com › blogs › aws › introducing-claude-sonnet-4-5-in-amazon-bedrock-anthropics-most-intelligent-model-best-for-coding-and-complex-agents
Introducing Claude Sonnet 4.5 in Amazon Bedrock: Anthropic’s most intelligent model, best for coding and complex agents | Amazon Web Services
September 29, 2025 - Claude Sonnet 4.5 demonstrates advancements in agent capabilities, with enhanced performance in tool handling, memory management, and context processing. The model shows marked improvements in code generation and analysis, from identifying optimal ...
Claude Docs
platform.claude.com › docs › en › about-claude › models › whats-new-claude-4-5
What's new in Claude 4.5 - Claude Docs
4 weeks ago - Features a more accessible price point than previous Opus models. Available with a 200k token context window. Claude Sonnet 4.5: Our best model for complex agents and coding, with the highest intelligence across most tasks.
Reddit
reddit.com › r/anthropic › sonnet 4.5 is available now!
r/Anthropic on Reddit: Sonnet 4.5 is available now!
September 29, 2025 - Although Claude still has superior understanding of user intent and nuance in many cases. ... Probably just fixed Sonnet 4 and calling it an upgrade. ... No, it behaves quite differently from Sonnet or Opus 4. It's a bit closer to GPT-5 in some of the good ways, but it's also its own thing.
Claude Docs
platform.claude.com › docs › en › about-claude › models › overview
Models overview - Claude Docs
When we release new model snapshots, we migrate aliases to point to the newest version of a model, typically within a week of the new release. While aliases are useful for experimentation, we recommend using specific model versions (e.g., claude-sonnet-4-5-20250929) in production applications to ensure consistent behavior.
OpenRouter
openrouter.ai › anthropic › claude-sonnet-4.5
Claude Sonnet 4.5 - API, Providers, Stats | OpenRouter
September 29, 2025 - Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across system design, code security, and specification adherence.
Google Cloud
cloud.google.com › blog › products › ai-machine-learning › announcing-claude-sonnet-4-5-on-vertex-ai
Announcing Claude Sonnet 4.5 on Vertex AI | Google Cloud Blog
September 30, 2025 - Claude Sonnet 4.5 is built to work independently for hours, maintaining clarity while orchestrating tools and coordinating multiple agents to solve complex problems. It’s designed to excel at long-running tasks with enhanced domain knowledge in coding, finance, research, and cybersecurity.
Microsoft Azure
azure.microsoft.com › blog home › ai + machine learning › introducing claude opus 4.5 in microsoft foundry
Introducing Claude Opus 4.5 in Microsoft Foundry | Microsoft Azure Blog
1 month ago - Having Claude’s advanced reasoning alongside GPT models in one platform gives us flexibility to build scalable, enterprise-grade workflows that move far beyond prototypes. —Michele Catasta, President, Replit · Opus 4.5 sets a new bar for coding, agentic workflows, and enterprise productivity: outperforming Sonnet 4.5 and Opus 4.1, at a more accessible price point.
Every
every.to › vibe-check › vibe-check-claude-sonnet-4-5
Vibe Check: Claude Sonnet 4.5
September 29, 2025 - Anthropic just rolled out Claude Sonnet 4.5, and, of course, we spent the weekend using it to code and running long agentic tasks with it.
YouTube
youtube.com › watch
Hello Claude Sonnet 4.5! This thing is a BEAST! - YouTube
Claude Sonnet 4.5, Anthropic’s most advanced model for coding and real-world agents, is now rolling out in GitHub Copilot across GitHub, GitHub Copilot CLI, ...
Published September 30, 2025
Databricks
databricks.com › blog › claude-opus-45-here
Claude Sonnet 4.5 Is Here | Databricks Blog
September 29, 2025 - We’re pleased to help customers accelerate that transformation with Claude Opus 4.5 and Claude Sonnet 4.5, Anthropic’s new frontier model, which can now be directly applied to your governed data at scale through DBSQL and used to build agents with Agent Bricks.
Claude
docs.claude.com › en › docs › about-claude › models › whats-new-claude-4-5
What's new in Claude 4.5 - Claude Docs
October 16, 2025 - Claude Haiku 4.5: Our fastest and most intelligent Haiku model with near-frontier performance. The first Haiku model with extended thinking · Claude Sonnet 4.5 is our best coding model to date, with significant improvements across the entire ...
Aimagazine
aimagazine.com › news › how-claudes-sonnet-4-5-sets-a-new-ai-coding-standard
How Claude’s Sonnet 4.5 Sets a New AI Coding Standard | AI Magazine
September 30, 2025 - Now, Anthropic has released Claude Sonnet 4.5, a model designed for software development and computer operation tasks.
Medium
medium.com › data-science-in-your-pocket › claude-4-5-sonnet-bye-bye-software-devs-7c35c244e357
Claude 4.5 Sonnet : Bye bye Software Devs | by Mehul Gupta | Data Science in Your Pocket | Medium
September 30, 2025 - Sonnet 4.5 nails this. On OSWorld, the benchmark that tests computer-use, it now leads at 61.4%, compared to Sonnet 4’s 42.2% just four months ago. On SWE-bench Verified, which measures real-world software engineering tasks, it sits firmly at the top. This is where it earns the title of best coding model. ... Anthropic didn’t just ship the model, they overhauled the ecosystem. Claude Code: checkpoints (finally), a better terminal, and a native VS Code extension.
Simon Willison
simonwillison.net › 2025 › Sep › 29 › claude-sonnet-4-5
Claude Sonnet 4.5 is probably the “best coding model in the world” (at least for now)
September 29, 2025 - Claude Sonnet 4.5 is the best coding model in the world. It’s the strongest model for building complex agents. It’s the best model at using computers.
Axios
axios.com › 2025 › 09 › 29 › anthropic-claude-sonnet-coding-agent
Anthropic's Claude Sonnet 4.5 is better at coding, finance, cybersecurity
September 29, 2025 - Claude Sonnet 4.5, released Monday, outperforms prior versions at coding, finance, cybersecurity and long-duration autonomous work, Anthropic said.