Connect Claude Code to an LLM gateway changedllm-gateway-connect
Nearest release: v2.1.310, published 19 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 24 Oct 2026 17:18 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 17:37 UTC.
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515515| `400` errors on every request, in the gateway's own words rejecting a tool's input schema or its `pattern`, on Claude Code v2.1.265 through v2.1.267 | In a gradual rollout on those versions, the [Artifact tool](https://code.claude.com/docs/en/artifacts.md#availability) schema carries a regular expression with `\p{...}` Unicode character classes. The Anthropic API accepts it, but a gateway or upstream that checks each tool schema's `pattern` with its own regex engine rejects the whole request | Update to v2.1.268 or later, which doesn't send the regular expression. On an affected version, [turn artifacts off](https://code.claude.com/docs/en/artifacts.md#disable-artifacts), which removes the tool and its schema from requests |
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 |
518| `/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. The same message appears on an open network when the check presents a gateway-issued key from `ANTHROPIC_API_KEY` or an `apiKeyHelper` and Anthropic rejects it | Allowlist `api.anthropic.com` if egress is blocked, or set a skip variable; for a rejected gateway key only the skip variables help. 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 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 Anthropic 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) |
518| `/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) |
520| `/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) |
520521| 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 |
521522| `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 |
522523| `This machine's managed settings require a first-party login`, or [`Administrator policy requires a Cloud gateway sign-in`](https://code.claude.com/docs/en/errors#administrator-policy-requires-a-cloud-gateway-sign-in) when managed settings set `forceLoginMethod` to `"gateway"` or also set `forceLoginGatewayUrl` | Managed settings include `forceLoginMethod` or `forceLoginOrgUUID`, which cannot coexist with `ANTHROPIC_API_KEY`, `ANTHROPIC_AUTH_TOKEN`, or `apiKeyHelper` | Your administrator must remove `forceLoginMethod`, `forceLoginOrgUUID`, and `forceLoginGatewayUrl` from managed settings to use gateway credentials, or remove the gateway credential and use the sign-in the managed settings require. The two cannot be combined |
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