Models

Claude Sonnet 4.6

Anthropic · February 2026

Balanced speed and quality for writing and code, over very long documents.

Superseded by Claude Sonnet 5 →

  • Modalities

  • Context window

    1,000,000 tokens, ≈ 750,000 words · about 3,000 pages

  • Max output

    128,000 tokens, ≈ 96,000 words in a single answer

  • Knowledge cutoff

    August 2025

Reasoning effort

Default: High

  • Low

  • Medium

  • High

  • Max

Providers

Files you can attach

  • ImagesJPG, PNG, GIF, WEBP
  • DocumentsPDF
  • Text and codeTXT, MD, CSV, TSV, RPT, LOG, PY, TS, TSX, JS, JSX, CS, GO, JAVA, KT, SWIFT, CPP, C, H, PHP, RB, SQL, SH, PS1, HTML, CSS, SCSS, JSON, YAML, YML, XML, INI

Tools

  • Web searchSupported
  • Code interpreterSupported

Features

  • StreamingSupported
  • Function callingSupported
  • Structured outputsSupported
  • Fine-tuningNot supported

Ready to try it?

Log in

Bring your own API key · Your chats stay in your browser