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Claude Code
Courtesy of Anthropic · Press kit, editorial use (opens claude.com)

Claude Code

by AnthropicUS

ScalingStage 5 of 5

Generally available since May 2025 and one of the most widely used coding agents.

Updated 9 Dec 2025Checked 25 Sep0 updates this week

Milestones

No announced next step
  1. Model Context Protocol open-sourced25 Nov 2024Complete.
  2. Claude Code research preview24 Feb 2025Complete.
  3. Claude Code generally available22 May 2025Complete.
  4. Claude Agent SDK released29 Sep 2025Complete.
  5. MCP donated to the Linux Foundation's Agentic AI FoundationDec 2025Complete.

Most important updates

  • 9 Dec 2025
  • 2 Dec 2025
  • 20 Oct 2025
  • 22 May 2025
  • 25 Nov 2024

Current obstacles

  • Safe autonomy on real machinesAgents with computer access can delete data or be tricked by hidden instructions in files and web pages. Permissions reduce the risk.

Physics limits

  • Errors compound over long tasksIf each step succeeds 99% of the time, a 100-step task succeeds only about 37% of the time (0.99^100). Agents need near-perfect per-step reliability to work for hours.
  • No program can prove code correct in generalRice's theorem: no algorithm can decide non-trivial properties of every program. Agents lean on tests, and code that passes weak tests can still be wrong.
  • Summaries lose detailWhen a long session fills the context window, earlier work is compressed into summaries. Details dropped there are gone, so very long sessions drift.

How it works

4 parts
Code open on a developer's laptop: Claude Code runs in the terminal on the developer's own machine, reading and editing files like these
Code open on a developer's laptop: Claude Code runs in the terminal on the developer's own machine, reading and editing files like thesePhoto: Mohammad Rahmani · Unsplash License (opens unsplash.com)
Terminal

An agent in your shell

Runs in the terminal, IDE, desktop and web with tools to read files, search, edit and run commands, working through a task step by step.

Permissions

Asks before it acts

By default it asks before editing files or running commands. Users can pre-approve safe actions; web sessions run in a sandbox.

Memory

Project notes and context

A CLAUDE.md file holds project rules. When the context window fills, older work is summarised so long sessions can continue.

MCP

Plugs into other tools

Through the Model Context Protocol it connects to databases, issue trackers and browsers, and can hand side tasks to parallel subagents.

Papers & demos

1 item
  1. Nov 2024code
    Model Context ProtocolOpen standard for plugging AI agents into tools and data, now used across the industry.

Update log

5 updates

Tue 9 Dec 2025

  • Minor: BlogPartnership

Tue 2 Dec 2025

  • Major: BlogCommercial

Mon 20 Oct 2025

  • Minor: BlogSoftware

Thu 22 May 2025

  • Major: BlogSoftware

Mon 25 Nov 2024

  • Major: BlogSoftware

About Anthropic

The team behind Claude Code

Anthropic

Claude models, Claude Code, AI safety

Anthropic is an AI safety company that makes the Claude models. Former OpenAI researchers founded it in 2021. It studies how models work inside, and Claude is widely used for coding and business agents.

  • Raised $65B at a $965B valuation in May 2026, after a $30B round in February.
  • Claude Code, launched in 2025, made Claude a leading model for AI coding agents.
  • Trains on Google, Amazon and NVIDIA chips instead of relying on one supplier.

anthropic.com (opens anthropic.com)Company profile →

Founded
20215 yrs
Headquarters
United States
Status
Private
Valuation
$965BprivateMay 2026
Raised
$131B6 rounds
Last round
Series H · $65BMay 2026$965B post
Works in
AIFrontier models
Coverage
2 programs · 22 updateslatest 23h agochecked 25 Sep
Lead investors
Altimeter CapitalDragoneerGreenoaksSequoia CapitalGICCoatueMicrosoftNVIDIAICONIQFidelity
Customers
Salesforce
Investors
AmazonMicrosoftNVIDIA
Suppliers
Google
People
Dario AmodeiCEO and co-founderDaniela AmodeiPresident and co-founderJared KaplanChief Science Officer and co-founder
Primer