Claude Code - Hostlinku Docs

Claude Code uses the Anthropic Messages protocol. Hostlinku provides a compatible endpoint at POST /v1/messages (including /v1/messages/count_tokens), so Claude Code can be directed to Hostlinku simply by setting an environment variable—no additional proxy is needed.

Authentication: `AUTH_TOKEN` or `API_KEY`?

Variable	Header Sent	Supported by Hostlinku
`ANTHROPIC_AUTH_TOKEN`	`Authorization: Bearer sk-…`	Yes (recommended)
`ANTHROPIC_API_KEY`	`x-api-key: sk-…`	Yes

Both are accepted by the gateway; choose one—do not enter both with different values.

VS Code & JetBrains Extensions

The Claude Code extension checks for the login on its own, so the same variables must also be specified in the extension settings — VS Code: claudeCode.environmentVariables in settings.json:

{
  "claudeCode.environmentVariables": [
    { "name": "ANTHROPIC_BASE_URL", "value": "https://api.hostlinku.com" },
    { "name": "ANTHROPIC_AUTH_TOKEN", "value": "sk-isi-api-key-kamu" },
    { "name": "ANTHROPIC_DEFAULT_SONNET_MODEL", "value": "claude-sonnet-4-6" },
    { "name": "ANTHROPIC_DEFAULT_HAIKU_MODEL", "value": "claude-haiku-4-5" }
  ]
}

In JetBrains, set the same variable in Settings → Tools → Claude Code → Environment variables (or make sure the IDE is running from a shell that has already exported that variable).

Use a non-Claude model

Since the gateway translates protocols, the sonnet/haiku alias can be set to any slug from the catalog:

export ANTHROPIC_DEFAULT_SONNET_MODEL=gpt-5-5
export ANTHROPIC_DEFAULT_HAIKU_MODEL=deepseek-v4-flash

Features that depend on the model’s capabilities (tool use, extended thinking, vision) are determined by the target model’s capabilities—check the capabilities field in the catalog.

Troubleshooting

401 authentication_error even though the key is correct — old OAuth credentials are still being used. Run /logout, log out, and make sure ANTHROPIC_BASE_URL is accessible (/status).
Model not found (404) — meaning it hasn’t been pinned yet, so Claude Code sends the model name by default. Set ANTHROPIC_DEFAULT_*_MODEL to the catalog’s slug.
400 max_tokens exceeds the limit — reduce max_tokens via CLAUDE_CODE_MAX_OUTPUT_TOKENS (e.g., 32000) if the target model has a smaller output limit.
Rate limit (429) — Claude Code can run multiple sub-agents in parallel. See the limits at Usage & Limits.

​Authentication: AUTH_TOKEN or API_KEY?

​VS Code & JetBrains Extensions

​Use a non-Claude model

​Troubleshooting

Authentication: `AUTH_TOKEN` or `API_KEY`?

VS Code & JetBrains Extensions

Use a non-Claude model

Troubleshooting