Comet API

Comet API is supported as an Anthropic-compatible provider via the dedicated cometapi credential type. Requests are converted from OpenAI Chat Completions or Responses API format to Anthropic Messages API and sent to /v1/messages.

Configuration

credentials:
  - name: "comet_anthropic"
    type: "cometapi"
    api_key: "os.environ/COMET_API_KEY"
    base_url: "https://api.cometapi.com/v1"
    rpm: 60
    tpm: -1

Claude Model Aliases

Use public name values for clients, and map them to Comet model IDs with model where the provider names differ:

models:
  - name: "anthropic/claude-haiku-4.5"
    model: "claude-haiku-4-5-20251001"
    credential: comet_anthropic
  - name: "claude-haiku-4.5"
    model: "claude-haiku-4-5-20251001"
    credential: comet_anthropic
  - name: "claude-haiku-4-5-20251001"
    credential: comet_anthropic

  - name: "anthropic/claude-opus-4.1"
    model: "claude-opus-4-1-20250805"
    credential: comet_anthropic
  - name: "claude-opus-4.1"
    model: "claude-opus-4-1-20250805"
    credential: comet_anthropic
  - name: "claude-opus-4-1-20250805"
    credential: comet_anthropic

  - name: "anthropic/claude-opus-4.5"
    model: "claude-opus-4-5-20251101"
    credential: comet_anthropic
  - name: "claude-opus-4.5"
    model: "claude-opus-4-5-20251101"
    credential: comet_anthropic
  - name: "claude-opus-4-5-20251101"
    credential: comet_anthropic

  - name: "anthropic/claude-opus-4.6"
    model: "claude-opus-4-6"
    credential: comet_anthropic
  - name: "claude-opus-4-6"
    credential: comet_anthropic

  - name: "anthropic/claude-opus-4.7"
    model: "claude-opus-4-7"
    credential: comet_anthropic
  - name: "claude-opus-4-7"
    credential: comet_anthropic

  - name: "anthropic/claude-sonnet-4"
    model: "claude-sonnet-4-20250514"
    credential: comet_anthropic
  - name: "claude-sonnet-4"
    model: "claude-sonnet-4-20250514"
    credential: comet_anthropic

  - name: "anthropic/claude-sonnet-4.5"
    model: "claude-sonnet-4-5-20250929"
    credential: comet_anthropic
  - name: "claude-sonnet-4.5"
    model: "claude-sonnet-4-5-20250929"
    credential: comet_anthropic
  - name: "claude-sonnet-4-5-20250929"
    credential: comet_anthropic

  - name: "anthropic/claude-sonnet-4.6"
    model: "claude-sonnet-4-6"
    credential: comet_anthropic
  - name: "claude-sonnet-4-6"
    credential: comet_anthropic

Prompt Caching

cometapi uses the Anthropic Messages cache-control format:

{"cache_control": {"type": "ephemeral"}}

When session-sticky routing is active, the router can automatically inject cache markers for stable conversation history. Cache accounting is preserved in OpenAI responses:

Comet/Anthropic usage field	OpenAI-compatible response field
`cache_read_input_tokens`	`prompt_tokens_details.cached_tokens`
`cache_creation_input_tokens`	`prompt_tokens_details.cache_creation_tokens`

For claude-sonnet-4.5, prefer the dated Comet model claude-sonnet-4-5-20250929 for more stable prompt-cache behavior.

Error Masking

Comet upstream error bodies are masked before being returned to clients or logged. The HTTP status is preserved, but the response body is replaced with a neutral OpenAI-compatible error object.