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Anthropicv2.1.310Tested (smoke test)

Claude Code: what’s new in v2.1.310 and our verdict

Anthropic's agentic coding tool for your terminal, IDE and GitHub.

Official site

Release Ruler for Claude Code: marked at its Tested release date on the timeline of every AI model we track.

At a glance

Evidence
Tested (smoke test)
Released
Oct 23, 2026
Last verified
Oct 25, 2026
Pricing
Not verified
Best for
AI coding agents, vibe coding, agent building

Evidence and ranking

Evidence behind this verdict

  1. Sources read3 cited sources, latest fetched Oct 25, 2026. (done)
  2. Facts re-checkedLast verified Oct 25, 2026. (done)
  3. Run by usSmoke test on Oct 25, 2026 (scope below). (done)

Partly worked Test log result: Partly worked. Read the log

Where we rank it (editorial)

Editorial picks, not benchmark scores. How we rank.

Pricing: Pricing and plan limits were not checked. See Anthropic's plans pages. (checked 2026-10-25)

Our verdict

Update now if you use the sandbox or run Claude Code on a cloud provider; skip if you wanted flashy new features, this is a hardening release.

Good for

  • Anyone relying on the Bash sandbox or permission rules (the 2.1.309 fixes close real gaps)
  • Teams running Claude Code through Bedrock, Vertex or Foundry
  • Enterprise admins who want role-based control over cloud sessions and Remote Control

Skip if

  • You are looking for new headline capabilities; these two releases are mostly fixes
  • You script claude ultrareview; check the new --trust-workspace requirement before updating CI

Tested. Tested 2026-10-25 (America/Chicago). Installed with Anthropic's native installer (read first): "claude --version" printed 2.1.310 (the npm package installed 2.1.197, so use the native installer for this release). Pointed at a local Ollama model through its Anthropic-compatible API, headless "claude -p" ran the Edit tool and changed calc.py a-b to a+b when given the exact file path and strings; a vaguer first prompt made no edit (it said calc.py did not exist). Not tested: Claude models, subscription login, the sandbox fixes or ultrareview. Test environment: Linux x86_64 box with 8 CPUs and no GPU, no vendor account or API key. Agent tools were pointed at a local open-weight model (Qwen2.5-3B-Instruct, 4-bit, served by Ollama 0.40.11), so we tested the tool, not any vendor's hosted models. Full log: /tests/claude-code.

Full test log with exact commands, versions and raw output: Claude Code 2.1.310: our test log.

Evidence
Tested (smoke test, 2026-10-25, local Qwen2.5-3B-Instruct, not vendor models). A smoke test is not a benchmark.
What we ran
Installed with Anthropic's native installer (claude --version printed 2.1.310) and ran one headless edit task (change a-b to a+b in calc.py) through a local model; the first, vaguer prompt failed and the second, with the exact path and strings, succeeded.
Model used
Qwen2.5-3B-Instruct (4-bit), a small local open-weight model served by Ollama 0.40.11; no vendor-hosted model was used
Environment
Linux x86_64 box, 8 CPUs, no GPU; no vendor account, login or API key
Not tested
Claude models, subscription login, the sandbox and permission fixes, claude ultrareview and --trust-workspace, Bedrock/Vertex/Foundry.
Date
(America/Chicago)

Best for

What’s new

Claude Code 2.1.309 and 2.1.310 are heavy on sandbox and permission-check fixes, plus the Monitor tool now working on Bedrock, Vertex and Foundry and new Enterprise controls for cloud sessions.

  • v2.1.310: The Monitor tool and plugin monitors now work on Bedrock, Vertex and Foundry, and when telemetry or nonessential traffic is disabled.
  • v2.1.310: Requests no longer fail behind gateways that reject the effort beta value; Claude Code retries without it.
  • v2.1.310: Claude Code cloud sessions and Remote Control permissions can be given to Enterprise custom roles.
  • v2.1.310: On Linux, /sandbox now names Ubuntu's AppArmor user-namespace restriction when it stops the sandbox starting, and how to lift it.
  • v2.1.309: Many security-flavored fixes: sandboxed Bash no longer runs shell startup files outside the sandbox, macOS sandbox denyWrite globs work through symlinks, and sandboxed commands can no longer modify the MCP config passed with --mcp-config.
  • v2.1.309: Several Bash permission-check fixes for compound commands, redirects and worktree-isolated sessions.
  • v2.1.309: claude ultrareview now requires workspace trust; scripts pass --trust-workspace.

How to set it up: Install Claude Code and check the sandbox

Install steps come from the project README. We ran the install and a short headless task on 2026-10-25. The sandbox step is based on the release notes and was not tested by us.

  1. Install Claude Code

    The README recommends the native installer. npm installation is marked deprecated.

    # macOS / Linux
curl -fsSL https://claude.ai/install.sh | bash
# or: brew install --cask claude-code
# Windows (PowerShell): irm https://claude.ai/install.ps1 | iex

  2. Start it in your project

    Navigate to your project directory and run claude, then sign in when prompted.

    cd your-project
claude

  3. Update to the latest version

    These fixes shipped in 2.1.309 and 2.1.310. Update using the method you installed with and check the version afterwards.

    claude --version

  4. Review your sandbox setup

    The release notes mention /sandbox and a Linux warning that names Ubuntu's AppArmor restriction on user namespaces when it stops bubblewrap from starting. Run /sandbox inside Claude Code to see your status. (Not tested by us.)

    /sandbox

Pros and cons

Pros

  • Very frequent releases with detailed notes
  • Works in terminal, VS Code and desktop, with plugins and skills
  • Sandbox and permission model keeps getting tighter

Cons

  • These notes are long and mixed together; hard to tell which fixes affect you
  • Some changes are behavior changes (for example ultrareview now requires workspace trust, and sed -i no longer previews edits)
  • Pricing and plan limits were not checked for this write-up
  • We did not test with Claude models or a subscription; the sandbox and ultrareview changes were not exercised

Alternatives and comparisons

  • Codex CLI: OpenAI's open-source coding agent that runs in your terminal.
  • Gemini CLI: Google's open-source terminal agent for Gemini, now largely replaced by Antigravity CLI for consumers.
  • Kiro: AWS's agentic coding tool that turns prompts into requirements, designs and tasks (spec mode), with an IDE and a CLI.
  • OpenHands: Open-source AI coding agent platform you can start locally, automate with workflows and run with any model.

See all alternatives to Claude Code

Anthropic models we track

All models · Releases by month

FAQ

What changed in Claude Code 2.1.310?

The Monitor tool and plugin monitors now work on Bedrock, Vertex and Foundry, gateway failures from the effort beta value are retried, Enterprise custom roles can control cloud sessions and Remote Control, and several cloud-session and admin fixes landed.

How do I install Claude Code?

On macOS or Linux run curl -fsSL https://claude.ai/install.sh | bash, or use Homebrew (brew install --cask claude-code). On Windows use the PowerShell installer or winget install Anthropic.ClaudeCode. npm installation is deprecated.

Should I update to v2.1.310?

If you use the Bash sandbox, permission rules or a cloud provider, yes: v2.1.309 and v2.1.310 contain relevant fixes. Check the ultrareview trust change first if you script it.

What we have not verified

  • Pricing and plan limits (not fetched)
  • Whether the sandbox fixes affect your specific setup (reported from release notes, not tested)
  • Sandbox fixes, ultrareview and behavior with Claude models (not tested; they need a signed-in session)

Sources

Last verified · Agentic Weekly

Part of the week of Oct 19, 2026 archive.

Guides for Claude Code

Latest news about Claude Code

  • Kiro: AWS's agentic coding tool that turns prompts into requirements, designs and tasks (spec mode), with an IDE and a CLI.
  • Codex CLI: A quality-of-life release: worth updating if you re-type the same prompts or switch models a lot, not a reason to switch tools.
  • OpenHands: Open-source AI coding agent platform you can start locally, automate with workflows and run with any model.

How to cite this page

Agentic Weekly, "Claude Code v2.1.310: what's new, verdict & setup", last updated 2026-10-25, https://theagenticweekly.com/tools/claude-code

Keep the Reported or Tested label when you quote a verdict. Plain-text version: https://theagenticweekly.com/tools/claude-code.md. More for AI assistants: /ai, /tools.json, /llms.txt.