# Claude Code v2.1.310: what's new, verdict & setup

Canonical: https://theagenticweekly.com/tools/claude-code · Released: 2026-10-23 · Last verified: 2026-10-25 · Evidence: Tested (smoke test, 2026-10-25, local Qwen2.5-3B-Instruct, not vendor models) · Vendor: Anthropic · Official site: https://code.claude.com/docs/en/overview

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

## 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.

Test scope:
- Kind and date: smoke test, 2026-10-25 (America/Chicago). 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.

Full test log (commands, versions, raw output): [Claude Code 2.1.310: our test log](https://theagenticweekly.com/tests/claude-code)

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

## Best for

- [Best AI tool for AI coding agents](https://theagenticweekly.com/best/ai-coding-agents) (#1): One of the most actively maintained coding agents, with daily releases and detailed changelogs.
- [Best AI tool for vibe coding](https://theagenticweekly.com/best/vibe-coding) (#1): Strong for vibe coding from the terminal or VS Code if you want the agent to run commands and edit files for you.
- [Best AI tool for agent building](https://theagenticweekly.com/best/agent-building) (#1): Plugins, skills, hooks and an Agent SDK are referenced in the changelog, which makes it a base for building your own agent workflows.

## 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

## Guides for Claude Code

- [How to add an MCP server to Claude Code](https://theagenticweekly.com/guides/add-mcp-server-to-claude-code) (Reported (not run by us): from the Claude Code docs; last verified 2026-10-26)
- [Best model for OpenCode, Cline and Claude Code: options by budget](https://theagenticweekly.com/guides/best-model-for-opencode-cline-claude-code) (Reported (not run by us): prices and setup from vendor docs; our tool tests do not measure model quality; last verified 2026-10-26)
- [Is Claude Opus 5.5 free? Which plans include it](https://theagenticweekly.com/guides/claude-opus-5-5-free-or-paid) (Reported (not run by us): from Anthropic's pricing page; we did not test access with an account; last verified 2026-10-26)
- [GitHub MCP server: how to set it up](https://theagenticweekly.com/guides/github-mcp-server) (Reported (not run by us): from the README and Claude Code docs; last verified 2026-10-26)
- [Which coding agents can use GPT-6.1 Terra?](https://theagenticweekly.com/guides/gpt-6-1-terra-in-coding-agents) (Reported (not run by us): from vendor docs and changelogs; last verified 2026-10-26)
- [How to run Claude Code with a local model](https://theagenticweekly.com/guides/run-claude-code-with-a-local-model) (Tested (partial, 2026-10-25): one headless edit, small local model, not Claude models; last verified 2026-10-26)
- [Which Claude model should you use? Haiku 5.5, Sonnet 5.5, Opus 5.5 or Fable 5.1](https://theagenticweekly.com/guides/which-claude-model-should-i-use) (Reported (not run by us): Anthropic's docs plus our editorial judgement; last verified 2026-10-26)

## Alternatives

- [Codex CLI](https://theagenticweekly.com/tools/codex-cli): OpenAI's open-source coding agent that runs in your terminal.
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- [Kiro](https://theagenticweekly.com/tools/kiro): AWS's agentic coding tool that turns prompts into requirements, designs and tasks (spec mode), with an IDE and a CLI.
- [OpenHands](https://theagenticweekly.com/tools/openhands): Open-source AI coding agent platform you can start locally, automate with workflows and run with any model.
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- [Amazon Q Developer](https://theagenticweekly.com/tools/amazon-q-developer): AWS's AI coding assistant for IDEs and the CLI, with a free tier and a $19 Pro tier; IDE plugin support ends April 30, 2027.
- [Augment Code](https://theagenticweekly.com/tools/augment-code): Coding agent and 'Cosmos' platform with a Context Engine, CLI and cloud agents; plans are flat team prices with usage included.
- [Devin](https://theagenticweekly.com/tools/devin): Cognition's autonomous software engineer: a cloud coding agent that tests in its own browser and aims to hand back a mergeable pull request.
- [Qodo](https://theagenticweekly.com/tools/qodo): AI code review platform with 15+ agentic workflows for IDEs, pull requests and security, priced by team credits.
- [Warp](https://theagenticweekly.com/tools/warp): Warp's terminal and agent platform; it now pitches 'open infrastructure for cloud software factories' defined as code, with any model.
- [Zed](https://theagenticweekly.com/tools/zed): High-performance, multiplayer code editor from the creators of Atom and Tree-sitter, open source with AI optional.

## 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

- [GitHub release v2.1.310](https://github.com/anthropics/claude-code/releases/tag/v2.1.310) (fetched 2026-10-25)
- [GitHub release v2.1.309](https://github.com/anthropics/claude-code/releases/tag/v2.1.309) (fetched 2026-10-25)
- [Claude Code README (install instructions)](https://github.com/anthropics/claude-code) (fetched 2026-10-25)

## How to cite

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 the verdict.