Use ISH API with Claude Code
Claude Code should use the Anthropic-compatible ISH endpoint:https://api.ish.chat. Do not add/v1 for Claude Code.
1. Create an API key
Go to API keys, create a key, and copy it once. Claude Code requests will appear in API usage.
2. Export environment
Add these exports to your shell profile or run them in the same terminal before starting Claude Code.
export ANTHROPIC_BASE_URL="https://api.ish.chat"
export ANTHROPIC_API_KEY="ish_live_..."
export ANTHROPIC_MODEL="claude-sonnet-4.6"
export ANTHROPIC_SMALL_FAST_MODEL="claude-haiku-4.5"
export ANTHROPIC_DEFAULT_SONNET_MODEL="claude-sonnet-4.6"
export ANTHROPIC_DEFAULT_HAIKU_MODEL="claude-haiku-4.5"
export ANTHROPIC_DEFAULT_OPUS_MODEL="claude-opus-4.8"3. Optional persistent settings
If you prefer a config file, place the same values in your Claude Code settings. Use a user-level or project-level settings file depending on how you manage coding projects.
{
"env": {
"ANTHROPIC_BASE_URL": "https://api.ish.chat",
"ANTHROPIC_API_KEY": "ish_live_...",
"ANTHROPIC_MODEL": "claude-sonnet-4.6",
"ANTHROPIC_SMALL_FAST_MODEL": "claude-haiku-4.5",
"ANTHROPIC_DEFAULT_SONNET_MODEL": "claude-sonnet-4.6",
"ANTHROPIC_DEFAULT_HAIKU_MODEL": "claude-haiku-4.5",
"ANTHROPIC_DEFAULT_OPUS_MODEL": "claude-opus-4.8"
},
"model": "claude-sonnet-4.6"
}4. Verify
Start Claude Code, check the selected model, then send a tiny test prompt. The curl test confirms the same key works against the Anthropic-compatible endpoint.
claude
# Inside Claude Code:
/model
# Then send:
Reply exactly: ISH_OKTroubleshooting
Invalid role or message error: update Claude Code and use the latest ISH API deployment. ISH normalizes tool results and system messages for Claude Code.
Unsupported model: use an available model id such asclaude-sonnet-4.6. ISH also accepts connector-style variants such asclaude-sonnet-4-6,claude-sonnet-4-6-latest, and provider-prefixed ids.
401 error: check that ANTHROPIC_API_KEY is an active ish_live_ key.
Insufficient balance: add balance first. API and connector usage cannot spend free daily web usage.