Follow Discord
Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 20 Aug 2026
One change · claude-code

Environment variables changedenv-vars

Nearest release: v2.1.237, published an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+2added
Lines−1removed
From line 96 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits92to this page, all time

The whole hunk

from line 96, old and new numbered
/
lines

This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.

from line 96
9696 
9797## Precedence
9898 
99Some behaviors have both an environment variable and a dedicated settings key. If you set both, the environment variable takes precedence. For example, `ANTHROPIC_MODEL` overrides the `model` setting, and `CLAUDE_CODE_AUTO_CONNECT_IDE` overrides `autoConnectIde`. Claude Code uses the settings key only when the environment variable is unset.
99Some behaviors have both an environment variable and a dedicated settings key. If you set both, the environment variable takes precedence, except for [`ANTHROPIC_DEFAULT_MODEL`](/docs/en/model-config#set-a-default-model-for-new-sessions). For example, `ANTHROPIC_MODEL` overrides the `model` setting, and `CLAUDE_CODE_AUTO_CONNECT_IDE` overrides `autoConnectIde`.
100100 
101101When the same variable is set in both your shell and a settings file `env` block, the settings file value applies. Claude Code writes each `env` entry into the process environment at startup and again when the file changes, replacing the value inherited from the shell. A few variables are special-cased; the [`env` setting](/docs/en/settings#available-settings) lists the exceptions.
102102 
from line 153
153153| `ANTHROPIC_DEFAULT_HAIKU_MODEL_DESCRIPTION` | Display description for the pinned Haiku model in the `/model` picker. Defaults to `Custom Haiku model` when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
154154| `ANTHROPIC_DEFAULT_HAIKU_MODEL_NAME` | Display name for the pinned Haiku model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
155155| `ANTHROPIC_DEFAULT_HAIKU_MODEL_SUPPORTED_CAPABILITIES` | Comma-separated list of [capabilities](/docs/en/model-config#customize-pinned-model-display-and-capabilities) the pinned Haiku model supports, for example `effort,thinking`. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
156| `ANTHROPIC_DEFAULT_MODEL` | Model that new sessions start on by default. Requires Claude Code v2.1.236 or later. See [Set a default model for new sessions](/docs/en/model-config#set-a-default-model-for-new-sessions) |
156157| `ANTHROPIC_DEFAULT_OPUS_MODEL` | Model ID that the `opus` alias resolves to, and that `opusplan` uses while Plan Mode is active. See [Model configuration](/docs/en/model-config#environment-variables) |
157158| `ANTHROPIC_DEFAULT_OPUS_MODEL_DESCRIPTION` | Display description for the pinned Opus model in the `/model` picker. When not set, defaults to `Custom Opus model`, or `Custom Opus model (1M context)` if the pinned model ID has the `[1m]` suffix and `CLAUDE_CODE_DISABLE_1M_CONTEXT` isn't turned on. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
158159| `ANTHROPIC_DEFAULT_OPUS_MODEL_NAME` | Display name for the pinned Opus model in the `/model` picker. Defaults to the model ID when not set. See [Model configuration](/docs/en/model-config#customize-pinned-model-display-and-capabilities) |
from line 340
339340| `CLAUDE_CODE_SIMPLE_SYSTEM_PROMPT` | Set to `1` to use a shorter system prompt and abbreviated tool descriptions on any model. Set to `0`, `false`, `no`, or `off` to opt out even on models where the experiment or server configuration would otherwise enable it. The full tool set, hooks, MCP servers, and CLAUDE.md discovery remain enabled |
340341| `CLAUDE_CODE_SKIP_ANTHROPIC_AWS_AUTH` | Skip client-side authentication for [Claude Platform on AWS](/docs/en/claude-platform-on-aws), for gateways that sign requests themselves |
341342| `CLAUDE_CODE_SKIP_AWS_CRED_CACHE` | Set to `1` to turn off the in-process cache of credentials resolved from the AWS default credential provider chain, so Claude Code resolves the chain on every API request. With the cache off, an SSO-backed profile requests credentials from IAM Identity Center on every request. See [credential caching and resolution timeout](/docs/en/amazon-bedrock#credential-caching-and-resolution-timeout). Requires Claude Code v2.1.207 or later |
342| `CLAUDE_CODE_SKIP_BEDROCK_AUTH` | Skip AWS authentication for Amazon Bedrock (for example, when using an LLM gateway) |
343| `CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS` | Set to `1` to treat a failed [fast mode](/docs/en/fast-mode#use-fast-mode-behind-proxies-and-llm-gateways) availability check as available, for networks that block the check's direct request to `api.anthropic.com`. Claude Code still honors a "disabled by your organization" response
343| `CLAUDE_CODE_SKIP_BEDROCK_AUTH` | Skip AWS authentication for Amazon Bedrock (for example, when using an LLM gateway)
Feedback