Claude 4 Sonnet vs Claude 4.5 Haiku

https://preview.redd.it/lm1pxnzzl4sf1.png?width=2160&format=png&auto=webp&s=fe15e1db93ef31b6d39bf959715f67701ede2271

Introducing Claude Sonnet 4.5—the best coding model in the world. 

It's the strongest model for building complex agents, the best model for computer use, and it shows substantial gains on tests of reasoning and math.

We're also introducing upgrades across all Claude surfaces

**Claude Code**

* The terminal interface has a fresh new look
* The new VS Code extension brings Claude to your IDE. 
* The new checkpoints feature lets you confidently run large tasks and roll back instantly to a previous state, if needed

**Claude App**: 

* Claude can use code to analyze data, create files, and visualize insights in the files & formats you use. Now available to all paid plans in preview. 
* The Claude for Chrome extension is now available to everyone who joined the waitlist last month

**Claude Developer Platform**: 

* Run agents longer by automatically clearing stale context and using our new memory tool to store and consult more information.
* The Claude Agent SDK gives you access to the same core tools, context management systems, and permissions frameworks that power Claude Code

We're also releasing a temporary research preview called **"Imagine with Claude"**

* In this experiment, Claude generates software on the fly. No functionality is predetermined; no code is prewritten.
* Available to Max users for 5 days. [Try it out](https://claude.ai/imagine)

Claude Sonnet 4.5 is available everywhere today—on the Claude app and Claude Code, the Claude Developer Platform, natively and in Amazon Bedrock and Google Cloud's Vertex AI.

Pricing remains the same as Sonnet 4.

[Read the full announcement](https://www.anthropic.com/news/claude-sonnet-4-5)

[https://www.anthropic.com/news/claude-sonnet-4-5](https://www.anthropic.com/news/claude-sonnet-4-5)

As you can see in the graph above, while in October, the use of Claude Sonnet 4.5 Thinking was normal, since the 1st of November, Perplexity has deliberately rerouted most if not ALL Sonnet 4.5 and 4.5 Thinking messages to far worse quality models like Gemini 2 Flash and, interestingly, Claude 4.5 Haiku Thinking which are probably cheaper models.

Perplexity is essentially SCAMMING subscribers by marketing their model as "Sonnet 4.5 Thinking" but then having all prompts given by a different model--still a Claude one so we don't realise!

Very scummy.

Claude Sonnet 4.6 is a full upgrade across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. It also features a 1M token context window in beta.

Sonnet 4.6 has improved on benchmarks across the board. It approaches Opus-level intelligence at a price point that makes it practical for far more tasks.

It also shows a major improvement in computer use skills. Early users are seeing human-level capability in tasks like navigating a complex spreadsheet or filling out a multi-step web form.

Claude Sonnet 4.6 is available now on all plans, Cowork, Claude Code, our API, and all major cloud platforms. We've also upgraded our free tier to Sonnet 4.6 by default.

Learn more: [anthropic.com/news/claude-sonnet-4-6](http://anthropic.com/news/claude-sonnet-4-6)

"We are reserving Claude 4 Sonnet...for things that are quite significant leaps"

We went back and named a previous version 3.6 to justify Claude 3.7 — and we're saving names like Claude 4 Sonnet for significant leaps, which are coming.

Full video: https://www.youtube.com/watch?v=YhGUSIvsn_Y

https://www.an.com/news/claude-sonnet-4-5