Claude 4.5 built Slack in thirty straight hours – here is my honest take after testing it thoroughly

@azxcsdf456

27.2K followers · usually 5.3K views a post

Views

29.0K

Likes

324

Comments

33

Shares

82

SoundTikTok sound · original sound - azxcsdf456

Promoted product

Claude 4.5

Why it worked

The video leverages a surprising and impressive claim (building Slack in 30 hours) to generate interest, positioning the AI model as a significant advancement in AI capabilities for complex, long-term tasks.

Summary

The video discusses the capabilities of Claude 4.5, an AI model that reportedly built Slack in 30 hours. The speaker highlights how this demonstrates a shift towards AI agents handling longer-term tasks proactively, drawing parallels to Anthropic's new 'Pulse' product.

Structure

1Introduction to Claude 4.5's capability to build Slack
2Explanation of the shift towards proactive AI agents
3Comparison to existing AI models like ChatGPT
4Discussion of Anthropic's 'Pulse' product as an example
5Future implications of proactive AI agents

Original caption

Claude 4.5 built Slack in thirty straight hours – here is my honest take after testing it thoroughly #claude #ai #slack #testing

More from @azxcsdf456

Product placement

The video prominently features "Claude Opus 4.5" and "Claude Sonnet 4.5" with graphics and text overlays, discussing its capabilities in code generation and task execution.

On-screen text

Claude Opus 4.5 Core Capability Breakthrough Significant Improvement compared to previous generation model Code Generation SWE-bench Ranked #1 Aider improved 10.6% Leading in 7/8 languages Exceeds human level Core Advantage Production-grade code quality Effort Parameter Innovative Cost Mechanism Deep reasoning capability Three-tier performance adjusted 800K tokens Save 40%-50% Flexible trade-off Core Advantage Smart cost optimization Long Context Three-tier performance adjusted 800K tokens Vending +25% Table processing optimization Core Advantage Complex task execution Cost-Effectiveness Significant price reduction $5/$25 billing 40% reduction compared to 3.5 Globally available Core Advantage Enterprise-grade affordability Claude 4.5 built Slack in thirty straight hours - here is my honest take after testing it thoroughly Jul, 02, 2026 HOUR Claude Sonnet 4.5 FREE Claude 4 Sonnet Sonnet 4.5 Claude app Claude Developer Platform Claude Code

Transcript

Claude 4.5 rebuilt Slack in thirty straight hours. No stops, no 11,000 lines of code, and it worked. That's the headline out of Anthropic. They are pushing harder and harder into longer term tasks for agents. Why care? Why would we have Slack? We already have Slack. We care because this is what the future looks like. It looks like agents taking tasks and working for a long time, you know how chat GPT coming and just answer right away? Not anymore. We start to see and do work and come back after a while. We already see this in other areas. So chat GPT, their new Pulse product this week. Pulse is a great response delivered the next day. And so it looks at previous chats you've had and it proactively goes and thinks about things you might wanna think about and learn about and consume in a briefing every morning. It's only available to pro users right now, but like most of these things, it's coming to everybody soon. And the point is that proactive agents are going with us everywhere.