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claude code

through messages · /v1/messages · every model blackrouter serves, with its price and context window

model

deepseek-v4.1-flash · $0.30 in · $1.20 out /m · 128K context (not stated: 128K taken)

  1. a key

    create an account, then make an api key on it: it is shown once, so keep it.

    it goes in claude code's settings, below, as ANTHROPIC_AUTH_TOKEN.

  2. point claude code at blackrouter

    ~/.claude/settings.json 
    {
  "model": "deepseek-v4.1-flash",
  "env": {
    "ANTHROPIC_BASE_URL": "https://blackrouter.sh",
    "ANTHROPIC_AUTH_TOKEN": "brk-…",
    "ANTHROPIC_DEFAULT_MODEL": "deepseek-v4.1-flash",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "deepseek-v4.1-flash",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "deepseek-v4.1-flash",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "deepseek-v4.1-flash",
    "CLAUDE_CODE_MAX_CONTEXT_TOKENS": "131072",
    "CLAUDE_CODE_ATTRIBUTION_HEADER": "0"
  }
}

    beside what ~/.claude/settings.json holds already, your key in place of brk-… · claude code reads it when it starts

    /model
    its opus and sonnet rows name the model; haiku, for background work, deepseek-v4.1-flash
    compacts in time
    before 128K tokens: claude code would take an unknown model's as 200K

  3. use it

    terminal 
    claude

    /model deepseek-v4.1-flash in a session switches to any id above, tags included.

other ways

take "model" and those lines of "env" out of ~/.claude/settings.json