CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS is a Claude Code environment variable: Controls whether Claude Code suppresses or bypasses network errors that occur specifically in fast mode. Fast mode uses the same Opus 4.6 model with faster output, but the accelerated path may have different failure modes or endpoints. Added between v2.1.77 and v2.1.79 and still present in v2.1.294. It is listed in the official reference.

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS": "<value>"
  }
}

Release notes that mention it

• Claude Code v2.1.76 — 3 New Environment Variables: MCP Elicitation and Worktree Improvements

Related variables

• CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK: Disables the organization-level eligibility check for fast mode.
• CLAUDE_CODE_DISABLE_FAST_MODE: Disable the /fast toggle that uses the same model with faster output.
• CLAUDE_CODE_ENABLE_OPUS_4_7_FAST_MODE
• CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE: Pin Fast mode to Opus 4.6.
• ANTHROPIC_SMALL_FAST_MODEL: Override small/fast model for quick operations.
• CLAUDE_CODE_AUTO_MODE_MODEL: Picks the model that classifies each proposed edit — deliberately separate from the model doing the work.
• CLAUDE_CODE_SKIP_MODEL_ACCESS_MEMORY
• ANTHROPIC_CUSTOM_MODEL_OPTION

Frequently asked questions

All variables, searchable: Claude Code environment variables.