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The AI models we measure with

Claude Sonnet 5

Anthropic

Claude Sonnet 5 is Anthropic’s conversational AI model, offering a 1 million‑token context window and enhanced agentic abilities such as planning, tool use, and web browsing. It is widely deployed as a default assistant for free and paid users in productivity, research, and coding workflows, bridging performance between Anthropic’s standard models and its Opus series.

Model details

Model ID
claude-sonnet-5
Context window
1M tokens
Max output
128k tokens
Knowledge cutoff
Jan 2026
Training data cutoff
Jan 2026

Knowledge cutoff vs training data cutoff

Knowledge cutoff and training data cutoff are different dates: the knowledge cutoff is roughly how current a model's world knowledge is, while the training data cutoff is when its training data ends. Both shape what a model knows about you.

What we use this model for

We ask this model directly about your company to see how it describes you and which names it brings up in your space. It is one of several frontier models in our measurement set, so your visibility is read across the assistants people actually use rather than from a single model.

Recent updates for this model

  1. today

    Anthropic claims a total addressable market exceeding $30 trillion, positioning its potential valuation above SpaceX, and is planning an IPO for September. The company has also rolled out enterprise-managed MCP connectors to enhance infrastructure integration.

    • Claude Code now supports starting sessions from mobile devices, featuring automatic connection recovery and faster loading on iOS.
    • Anthropic launched Claude Academy, a collection of free courses, tutorials, and job-specific guides.
    • Anthropic claims a total addressable market exceeding $30 trillion, surpassing SpaceX's $28.5 trillion estimate, with plans to go public by September.
    • Anthropic rolled out enterprise-managed MCP connectors for enterprise environments.
    • Claude Tag now supports following entire Slack conversations to proactively participate in discussions.
    • A study of AI safety containment plans found gaps in Anthropic's post-misbehavior shutdown procedures.
    • ClaudeBot traffic surged alongside GPTBot in recent web analytics.

    Sources: access@interactive.wsj.com, bensbites.com, dan@tldrnewsletter.com, swyx+ainews@substack.com

  2. 2 days ago

    Anthropic reported July annualized revenue of $65bn, up from $CO2$47bn in May, with model spend distribution led by Opus 5 and Opus 4.8. OpenAI's Q3 2026 API spending growth reached 82%, surpassing Anthropic's 76% growth.

    • Anthropic reported July annualized revenue of $65bn, an increase from $47bn in May.
    • Anthropic's model spend distribution is led by Opus 5 and Opus 4.8, with significant usage of Fable 5 and Sonnet 4.6.
    • OpenAI's Q3 2026 API spending grew 82% quarter-over-quarter, outpacing Anthropic's 76% growth.
    • Claude routines can now execute on Anthropic's servers, allowing scheduled tasks to run even when a local machine is shut or asleep.
    • A new 24/7 Telegram assistant has been built using Claude Code, incorporating memory and nightly reflection features.
    • Anthropic faces identified security issues regarding agent breaches.

    Sources: simonwillison.net, mail@joinhorizon.ai, cybercorsairs@mail.beehiiv.com, hi@mail.theresanaiforthat.com

  3. may be out of date

    Promptwatch launched a Generative Engine Optimization Tool that automates the tracking of prompt responses across chat products, including Claude. The tool publishes aggregate reports to identify invisible design changes in model outputs.

    • Promptwatch launched a Generative Engine Optimization Tool to track and report on prompt response changes in Claude and other chat products.

    Sources: simonwillison.net

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