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Claude Profile picture
@claudeai
Nov 24 • 8 tweets • 3 min read • Read on X
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Introducing Claude Opus 4.5: the best model in the world for coding, agents, and computer use.

Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done. Image
Our engineers have found that Opus 4.5 handles ambiguity and reasons about tradeoffs without hand-holding.

When pointed at a complex, multi-system bug, it figures out the fix.

Overall, Opus 4.5 just "gets it."
We’re also releasing new product features across our model line-up.

For Claude app users, long conversations no longer hit a wall.

Claude automatically summarizes earlier context as necessary, so you can keep the chat going indefinitely.
New on the Claude Developer Platform: tool search, programmatic tool calling, and tool use examples.

Together with effort control and context compaction, these let Claude run longer and do more with less intervention.

Read more: anthropic.com/engineering/ad…
Claude Code is now available in our desktop app.

Run multiple sessions in parallel: code, research, and update work all at once.

And Plan Mode gets an upgrade with Opus 4.5—Claude asks clarifying questions upfront, then works autonomously.
We’ve also expanded Claude for Chrome to all Max plan users.

Max, Team, and Enterprise users can work with Claude directly in Excel.

Now in beta: claude.com/claude-for-exc…Image
Opus 4.5 is available today on our API and on all three major cloud platforms.

Read more: anthropic.com/news/claude-op…Image

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More from @claudeai

Claude Profile picture
Oct 31
Claude Code's native installer is now generally available.

It's simpler, more stable, and doesn't require Node.js. We recommend this as the default installation method for all Claude Code users going forward. Image showing various scripts for installing Claude Code.
What’s improved with the native installer:

- The auto-updater is now more stable: users should run into fewer failed updates and bricked installs
- Claude Code is a single, self-contained executable, and no longer has a Node.js dependency
If you’re already using Claude Code, you can migrate to the new installer:

- Close all Claude Code sessions
- Run `claude install` in your terminal

For Alpine and musl/uClibc-based distributions, see our full docs below before updating.
Read 4 tweets
Claude Profile picture
Oct 30
An early look at what people are building with Claude Skills:
Turn content into a personalized, interactive course
Apply custom branding to reports that you generate
Read 7 tweets
Claude Profile picture
Oct 15
Introducing Claude Haiku 4.5: our latest small model.

Five months ago, Claude Sonnet 4 was state-of-the-art. Today, Haiku 4.5 matches its coding performance at one-third the cost and more than twice the speed. Chart showing Claude Sonnet 4.5 leads software engineering performance on SWE-bench Verified with 77.2% accuracy, followed by Haiku 4.5 at 73.3%.
Haiku 4.5 surpasses Sonnet 4 on computer use tasks, making Claude for Chrome even faster.

In Claude Code, it makes multi-agent projects and rapid prototyping markedly more responsive.
Sonnet 4.5 remains the best coding model in the world. Haiku 4.5 gives you near-frontier performance with greater cost-efficiency.

Use them together: Sonnet can build multi-step plans, then orchestrate a team of Haikus to complete subtasks in parallel.
Read 4 tweets
Claude Profile picture
Sep 29
This morning we announced several upgrades to Claude Code.

We also launched two new features for managing context on the Claude Developer Platform.

Here’s what’s new: Claude Code terminal interface showing welcome screen with recent project activity and new features including agent capabilities and security review tools, running Sonnet 4.5.
The Claude Agent SDK gives you access to the same core tools, context management systems, and permissions frameworks that power Claude Code.

Read how devs are building agents with the SDK:
anthropic.com/engineering/bu…
Claude Code has an updated terminal interface, plus a new VS Code extension for those who prefer to work fully in their IDE.

The new checkpoints feature lets you instantly undo Claude’s latest changes with Esc+Esc or /rewind.
Read 5 tweets
Claude Profile picture
Sep 29
Introducing Claude Sonnet 4.5—the best coding model in the world.

It's the strongest model for building complex agents. It's the best model at using computers. And it shows substantial gains on tests of reasoning and math. A benchmark table for Claude Sonnet 4.5 showing leading performance across many domains, including agentic coding, computer use, mathematics, graduate-level reasoning, and financial analysis.
We're also releasing upgrades for Claude Code.

The terminal interface has a fresh new look, and 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 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.

We've also made the Claude for Chrome extension available to everyone who joined the waitlist last month.
Read 6 tweets
Claude Profile picture
Sep 17
We've published a detailed postmortem on three infrastructure bugs that affected Claude between August and early September.

In the post, we explain what happened, why it took time to fix, and what we’re changing:
In early August, some users began reporting degraded responses.

It was initially hard to distinguish this from normal variation in user feedback. But the increasing frequency and persistence prompted us to open an investigation.
To state it plainly: We never reduce model quality due to demand, time of day, or server load.

The problems our users reported were due to infrastructure bugs alone.
Read 4 tweets

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