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Claude Profile picture
@claudeai
Oct 15 • 4 tweets • 2 min read • Read on X
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.
Devs can use Claude Haiku 4.5 on our API, Amazon Bedrock, and Google Cloud’s Vertex AI.

It’s a drop-in replacement for both Haiku 3.5 and Sonnet 4.

Read more: anthropic.com/news/claude-ha…

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More from @claudeai

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
Claude Profile picture
Sep 16
A roundup of what’s new in Claude Code:
Output styles and Learning mode:
Multi-directory support:
Read 9 tweets
Claude Profile picture
Sep 11
Over the last two weeks, 200+ members of r/ClaudeAI shared products, apps, and projects they’ve built with Claude.

Announcing the Built with Claude contest winners:
u/Legitimate-Gene-7047, a dentist, developed a professional cephalometric analysis app to replace the one they used in their clinic.

“I said to myself that even I could make an app that works better than this.”
u/Madoshakalaka created Aini, a bilingual chat app for him and his girlfriend to learn each other’s native languages.

“We have most of our daily conversations there now. She loves the app (the most important part!)”
Read 5 tweets
Claude Profile picture
Aug 19
How (and why) agents in Claude Code help you write better code, faster:

Agents allow you to deploy specialized experts for every task. It's like managing a team rather than collaborating 1-on-1. Image
To get started, launch Claude Code, run /agents and select "Create new agent."

Define it by describing what the agent should do and when it should be used. Be specific but not overly prescriptive.
The next step is to integrate your tools.

Agents can interact with external APIs, databases, or services via tools and MCP servers. Image
Read 5 tweets

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