Claude API Provider

The claude-api provider talks to the Claude Messages API directly with an x-api-key header. Use this when you have a Claude API key (billed per-token). For Claude Code OAuth, see claude-oauth.

Configuration

Setting	Value
Provider name	`claude-api`
Default base URL	`https://api.anthropic.com`
API key env var	`CLAUDE_API_KEY`
Auth method	`x-api-key` header
API version	`2023-06-01`

Minimal Setup

export MEKA_PROVIDER=claude-api
export MEKA_MODEL=claude-opus-4-6
export CLAUDE_API_KEY=sk-ant-api03-...
meka

Config File

[provider]
name = "claude-api"
model = "claude-opus-4-6"

Supported Models

Any model available through the Claude Messages API. Current line-up (per Anthropic’s models overview):

Family	Alias	Notes
Opus 4.7	`claude-opus-4-7`	Latest Opus — most capable, adaptive thinking
Sonnet 4.6	`claude-sonnet-4-6`	Latest Sonnet — speed + intelligence balance
Haiku 4.5	`claude-haiku-4-5`	Latest Haiku — fastest

Older but still available: claude-opus-4-6, claude-sonnet-4-5, claude-opus-4-5, claude-opus-4-1. Deprecated and retiring 2026-06-15: claude-opus-4-20250514, claude-sonnet-4-20250514.

Custom Base URL

To use a Claude-API-compatible proxy or gateway:

meka --provider claude-api --model claude-opus-4-6 --base-url https://my-proxy.example.com

API Details

Endpoint: POST {base_url}/v1/messages

Headers:

x-api-key: <api_key>
anthropic-version: 2023-06-01
content-type: application/json

System prompt: Sent as a top-level system string.

Tool format: Tools are defined with input_schema:

{
  "name": "read_file",
  "description": "Read the contents of a file at the given path.",
  "input_schema": { "type": "object", "properties": { ... } }
}

Streaming: Server-Sent Events with named event types (message_start, content_block_start, content_block_delta, content_block_stop, message_delta, message_stop, ping).

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