Connect Claude Code to an LLM gateway changedllm-gateway-connect
Upstream edited this page at 24 Oct 2026 23:04 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 24 Oct 2026 23:07 UTC.
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516516| `400` errors on every request, in the gateway's own words rejecting an unrecognized tool type, such as `Input tag 'advisor_20260301'`, on Claude Code v2.1.275 | In a gradual rollout on that version, requests carry an [advisor tool](https://code.claude.com/docs/en/advisor.md) entry even with the advisor off. The Anthropic API accepts it, but a gateway or upstream that validates tool types rejects the whole request; one that [forwards request body fields unchanged](https://code.claude.com/docs/en/llm-gateway-protocol.md#forward-as-open-lists) passes it through unaffected. The entry is a declaration that carries no conversation content | Update to v2.1.276 or later, which doesn't send the entry behind an `ANTHROPIC_BASE_URL` gateway unless you turn the advisor on. On v2.1.275, set [`CLAUDE_CODE_DISABLE_ADVISOR_TOOL=1`](https://code.claude.com/docs/en/env-vars), which removes the entry from requests |
517517| Models missing from the `/model` picker | Gateway model names aren't in Claude Code's built-in list, or Claude Code is showing a [`modelPicker`](https://code.claude.com/docs/en/settings-reference#modelpicker) lineup that replaces the built-in options | Enable [gateway model discovery](#add-gateway-models-to-the-model-picker) or add names with the [model configuration](https://code.claude.com/docs/en/model-config.md) variables. If Claude Code shows a replacing `modelPicker` lineup, add the gateway models to it, or ask your administrator to add them when managed settings supply it |
518518| `/fast` reports `Fast mode unavailable due to network connectivity issues` while inference requests work | The [fast mode](https://code.claude.com/docs/en/fast-mode.md) availability check goes directly to `api.anthropic.com` and doesn't follow `ANTHROPIC_BASE_URL`, so blocked direct egress fails the check | Allowlist `api.anthropic.com` if egress is blocked, or set a skip variable. See [use fast mode behind proxies and LLM gateways](https://code.claude.com/docs/en/fast-mode.md#use-fast-mode-behind-proxies-and-llm-gateways) |
519| `/fast` reports `Fast mode is currently unavailable` in a session that authenticates with a gateway-issued key in `ANTHROPIC_API_KEY` | While `ANTHROPIC_BASE_URL` points at your gateway, Claude Code withholds from `api.anthropic.com` a key that isn't in the format of an Anthropic API key. The [fast mode](https://code.claude.com/docs/en/fast-mode.md) availability check then isn't sent, and without an earlier successful check cached, Claude Code treats fast mode as unavailable | Set `CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS=1`; see [use fast mode behind proxies and LLM gateways](https://code.claude.com/docs/en/fast-mode.md#use-fast-mode-behind-proxies-and-llm-gateways) |
519| `/fast` reports `Fast mode is currently unavailable` in a session that authenticates with a gateway-issued key in `ANTHROPIC_API_KEY` | While `ANTHROPIC_BASE_URL` points at your gateway and the key isn't in the format of an Anthropic API key, Claude Code doesn't send the [fast mode](https://code.claude.com/docs/en/fast-mode.md) availability check. Without an earlier successful check cached, it treats fast mode as unavailable | Set `CLAUDE_CODE_SKIP_FAST_MODE_NETWORK_ERRORS=1`; see [use fast mode behind proxies and LLM gateways](https://code.claude.com/docs/en/fast-mode.md#use-fast-mode-behind-proxies-and-llm-gateways) |
520520| `/fast` reports `Fast mode has been disabled by your organization` in a session authenticated with `ANTHROPIC_AUTH_TOKEN`, even though the organization has fast mode enabled | The availability check requires a claude.ai login or an API key; with only a bearer token, Claude Code treats fast mode as disabled without sending the check | Set `CLAUDE_CODE_SKIP_FAST_MODE_ORG_CHECK=1`; see [use fast mode behind proxies and LLM gateways](https://code.claude.com/docs/en/fast-mode.md#use-fast-mode-behind-proxies-and-llm-gateways) |
521521| Claude Code asks you to log in even though the [curl test](#verify-the-connection) succeeds | The CLI has no credential of its own: a reachable base URL isn't one, and in an interactive session an `env` block in a project's `.claude/settings.json` or `.claude/settings.local.json` applies only after the first-run wizard and [trust prompt](https://code.claude.com/docs/en/permissions.md#what-runs-before-you-trust-a-folder) | Set `ANTHROPIC_AUTH_TOKEN` somewhere Claude Code reads before first-run setup: a shell export, the `env` block in `~/.claude/settings.json`, or managed settings |
522522| `ANTHROPIC_API_KEY` is set but ignored, with no prompt | The key needs a one-time approval in interactive sessions, and a previously declined key is ignored without asking again | Enable it under `/config` with the `Use custom API key` option |
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