Claude Code — Terminal AI Assistant Setup

Linux / macOS

export ANTHROPIC_BASE_URL="https://api2.claudestore.store"
export ANTHROPIC_API_KEY="YOUR_SK_CS2_KEY"
export ANTHROPIC_MODEL="claude-sonnet-4.6"
export ANTHROPIC_SMALL_FAST_MODEL="claude-haiku-4.5"
export DISABLE_TELEMETRY=1
export DISABLE_AUTOUPDATER=1

Reload your shell with source ~/.zshrc (or ~/.bashrc).

Windows PowerShell

$env:ANTHROPIC_BASE_URL = "https://api2.claudestore.store"
$env:ANTHROPIC_API_KEY = "YOUR_SK_CS2_KEY"
$env:ANTHROPIC_MODEL = "claude-sonnet-4.6"
$env:ANTHROPIC_SMALL_FAST_MODEL = "claude-haiku-4.5"
$env:DISABLE_TELEMETRY = "1"
$env:DISABLE_AUTOUPDATER = "1"

Project settings override user settings

A project-level .claude/settings.json at the repository root takes precedence over ~/.claude/settings.json. If the CLI suddenly stops connecting after switching directories, check whether the project ships its own settings file pointing at a different base URL or key.

Custom API key was previously rejected

If Claude Code refused this key in an earlier session (for example after an auth error), it stores the key fingerprint as rejected inside ~/.claude.json. Subsequent runs will keep blocking that key or repeatedly ask you to confirm it.

Fix: open ~/.claude.json and either approve the custom API key explicitly, or move its fingerprint from the rejected list into the approved list. Then restart the CLI.

401 / 403 from the gateway

The key is wrong, revoked, or you are sending it as ANTHROPIC_AUTH_TOKEN. Re-export it as ANTHROPIC_API_KEY and confirm it appears in env | grep ANTHROPIC.

UI model and ANTHROPIC_MODEL conflict

One of the most common mistakes: you pick a model in the Claude Code UI (for example opus[1m]), but the requests on the wire actually go out as a different model (for example claude-sonnet-4.6). The 1M context window or the selected effort never seem to apply.

This usually happens when ~/.claude/settings.json contains both:

• a top-level "model": "opus[1m]" (the UI / picker selection), and
• an env.ANTHROPIC_MODEL that points at a different model.

ANTHROPIC_MODEL is an environment override and will win over the UI selection for outgoing requests.ANTHROPIC_SMALL_FAST_MODEL is similar but only affects internal small/fast paths (summaries, lightweight steps) — it is not necessarily a bug, but it explains why some calls go to a different, cheaper model.

Recommended configurations

Option 1 — let the UI / picker control the model (do not set ANTHROPIC_MODEL):

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api2.claudestore.store",
    "ANTHROPIC_API_KEY": "YOUR_SK_CS2_KEY",
    "ANTHROPIC_SMALL_FAST_MODEL": "claude-haiku-4.5"
  },
  "model": "opus[1m]"
}

Option 2 — hard-pin a single model for every request via ANTHROPIC_MODEL:

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api2.claudestore.store",
    "ANTHROPIC_API_KEY": "YOUR_SK_CS2_KEY",
    "ANTHROPIC_MODEL": "claude-opus-4.6"
  }
}

Reserve ANTHROPIC_SMALL_FAST_MODEL for the small/fast model behavior only — don't use it as your main model.

Checklist: wrong model is being used

If any of the following is happening:

• the model shown in the UI doesn't match the model you see being charged,
• the 1m context flag isn't applied,
• your effort setting doesn't seem to take effect,
• Sonnet is used unexpectedly instead of Opus (or vice versa).

Check, in this order:

1. ~/.claude/settings.json — does env.ANTHROPIC_MODEL conflict with the top-level "model"?
2. .claude/settings.json in the project root — same check, project file wins over the user file.
3. Shell environment: env | grep ANTHROPIC — any ANTHROPIC_MODEL or ANTHROPIC_SMALL_FAST_MODEL exported from ~/.zshrc / ~/.bashrc / PowerShell profile?
4. VS Code / Claude Code extension settings — the extension may inherit its own environment with an ANTHROPIC_MODEL override.

Remove the conflicting override (or align both values), restart the CLI / VS Code, and try again.