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Claude Code Introduces Sonnet 5.5 With 1M Context

Agent workflows absorb expanded context limits.

  • TOOLING
  • TEARDOWN
Teardown28 September 2026

claude-code

Terminal-based agentic coding tool integrating codebase understanding and git workflows.

Adds native support for Claude Sonnet 5.5 featuring a 1M context window and updated API pricing.

Platform
Cross-platform terminal environment (macOS, Linux, Windows)
Release0.12.2028 September 2026

uv

Extremely fast Python package and project manager written in Rust.

Introduces lockfile reuse optimization when dependency declarations are semantically equivalent.

Licence
Apache-2.0
Platform
Cross-platform (macOS, Windows, Linux)

What this changes

Recent releases push expanded context windows and automated pagination into production tooling. Teams running agentic workflows gain deeper repository introspection without manual intervention, while python and protocol ecosystems tighten lockfile efficiency; teams should validate it before adoption.

The card

Claude Code Introduces Sonnet 5.5 With 1M Context — the card published on 29 September 2026

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Sources

anthropics/claude-code release v2.1.284 (28 Sep 2026 - https://github.com/anthropics/claude-code/releases/tag/v2.1.284); astral-sh/uv release 0.12.20 (28 Sep 2026 - https://github.com/astral-sh/uv/releases/tag/0.12.20); modelcontextprotocol/typescript-sdk release v2.2.0 (28 Sep 2026 - https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/v2.2.0)

Independent technology analysis published by Dockfinity. Every release, version, licence and figure carries the primary source it was read from.

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