Mike Lewis (@MikeLewis) header
Mike Lewis (@MikeLewis) profile picture

Mike Lewis

@MikeLewis

maker of stuff. kitten enthusiast. member of technical staff @ @AnthropicAI. formerly @ retool, instagram, square

 Bernal Heights, San Francisco
Joined August 2007
  • Tweets5.3K
  • Following507
  • Followers2K
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Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)Photo by Mike Lewis (@MikeLewis)
Mike Lewis retweeted
Forbes (@Forbes) profile picture
Forbes
@ForbesMar 6
Anthropic’s Claude reigns atop the iOS App Store, where it dethroned ChatGPT earlier this week. go.forbes.com/Oh0pbD
Image from Forbes (@Forbes)
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Mike Lewis retweeted
Mike Krieger (@mikeyk) profile picture
Mike Krieger
@mikeykFeb 28
Claude is #1 in the App Store today — I want to say a huge thank you to all of our new (and existing!) users for the support. We’re working hard for you, please share your thoughts and feedback along the way.
Image from Mike Krieger (@mikeyk)
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Mike Lewis retweeted
Claude (@claudeai) profile picture
Claude
@claudeai29 Sep 2025
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.

ALT 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.

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Introducing the next generation: Claude Opus 4 and Claude Sonnet 4. Claude Opus 4 is our most powerful model yet, and the world’s best coding model. Claude Sonnet 4 is a significant upgrade from its predecessor, delivering superior coding and reasoning.
A benchmarking table titled Claude 4 benchmarks comparing performance metrics across various capabilities including coding, reasoning, tool use, multilingual Q&A, visual reasoning, and mathematics.

ALT A benchmarking table titled Claude 4 benchmarks comparing performance metrics across various capabilities including coding, reasoning, tool use, multilingual Q&A, visual reasoning, and mathematics.

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PSA: Claude, @calacademy's beloved albino alligator, now has a 24/7 livestream — and it's giving us life. Watch: calacademy.org/learn-explore… The webcam is sponsored by @AnthropicAI — who, fittingly, also has a virtual assistant named Claude. The collab we didn't know we needed. 🐊🤝
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A few researchers at Anthropic have, over the past year, had a part-time obsession with a peculiar problem. Can Claude play Pokémon? A thread:
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You can now dictate messages to Claude on our iPhone, iPad, and Android apps.
A screen from the Claude mobile app with the text "How can I help you this morning?" and a recording bar at the bottom.

ALT A screen from the Claude mobile app with the text "How can I help you this morning?" and a recording bar at the bottom.

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Introducing an upgraded Claude 3.5 Sonnet, and a new model, Claude 3.5 Haiku. We’re also introducing a new capability in beta: computer use. Developers can now direct Claude to use computers the way people do—by looking at a screen, moving a cursor, clicking, and typing text.
A benchmark comparison table showing performance metrics for multiple AI models including Claude 3.5 Sonnet (new), Claude 3.5 Haiku, GPT-4o, and Gemini models across different tasks.

ALT A benchmark comparison table showing performance metrics for multiple AI models including Claude 3.5 Sonnet (new), Claude 3.5 Haiku, GPT-4o, and Gemini models across different tasks.

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Introducing Claude 3.5 Sonnet—our most intelligent model yet. This is the first release in our 3.5 model family. Sonnet now outperforms competitor models on key evaluations, at twice the speed of Claude 3 Opus and one-fifth the cost. Try it for free: claude.ai
Benchmark table showing Claude 3.5 Sonnet outperforming (as indicated by green highlights) other AI models on graduate level reasoning, code, multilingual math, reasoning over text, and more evaluations. Models compared include Claude 3 Opus, GPT-4o, Gemini 1.5 Pro, and Llama-400b.

ALT Benchmark table showing Claude 3.5 Sonnet outperforming (as indicated by green highlights) other AI models on graduate level reasoning, code, multilingual math, reasoning over text, and more evaluations. Models compared include Claude 3 Opus, GPT-4o, Gemini 1.5 Pro, and Llama-400b.

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New Anthropic research paper: Scaling Monosemanticity. The first ever detailed look inside a leading large language model. Read the blog post here: anthropic.com/research/mappi…
Title card for Scaling Monosemanticity: Extracting Interpretable Features from Claude 3 Sonnet

ALT Title card for Scaling Monosemanticity: Extracting Interpretable Features from Claude 3 Sonnet

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Mike Lewis retweeted
Anthropic (@AnthropicAI) profile picture
Anthropic
@AnthropicAI1 May 2024
The Claude iOS app has arrived. The power of frontier intelligence is now in your back pocket. Download now on the App Store: apps.apple.com/us/app/claude…
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Mike Lewis retweeted
Anthropic (@AnthropicAI) profile picture
Anthropic
@AnthropicAI1 May 2024
Introducing a new Team plan for Claude. Get increased usage for team members, easily manage users and billing, and tackle complex tasks with our large 200K context window.
A product image of Claude.ai showing the new Team plan that offers higher usage limits and early access to collaborative features.

ALT A product image of Claude.ai showing the new Team plan that offers higher usage limits and early access to collaborative features.

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Mike Lewis retweeted
Anthropic (@AnthropicAI) profile picture
Anthropic
@AnthropicAI4 Apr 2024
Tool use is now available in beta to all customers in the Anthropic Messages API, enabling Claude to interact with external tools using structured outputs.
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Our new model Claude 2.1 offers an industry-leading 200K token context window, a 2x decrease in hallucination rates, system prompts, tool use, and updated pricing. Claude 2.1 is available over API in our Console, and is powering our claude.ai chat experience.
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I took a day off from code, and @Square launches exactly what I've wanted for DI on #Swift. IT WAS WRITTEN! github.com/square/Cleanse
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square/Cleanse - Swift Dependency Injection ift.tt/1Ui642C #SwiftLang #iOSDev #iOSProgramming #Xcode #iOS
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Today we open sourced Cleanse🛀 - a dependency injection framework for Swift. Check it out for yourself here: squ.re/1URCBd1 🚿
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Mike Lewis retweeted
Square (@Square) profile picture
Square
@Square14 Oct 2015
We publicly filed our S-1 with the SEC. This Tweet does not constitute an offer of securities for sale. Legend here squ.re/1Lb9Sy0
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Mike Lewis retweeted
Square (@Square) profile picture
Square
@Square27 Aug 2015
Our new Appointments app lets you manage your schedule anywhere you take your phone. (So, everywhere.) squ.re/1JyiACO
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We’re joining forces with @Square to make delivery easy for all of your favorite restaurants! blog.trycaviar.com/2014/08/c…
Image from Block Party (@blockpartydd)
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