Endpoints

Base URL https://api.morphllm.com. One API key, two wire formats:

Endpoint	Format	Serves
`/v1/chat/completions`	OpenAI Chat Completions	All models
`/v1/messages`	Anthropic Messages	Open-source chat models
`/v1/messages/count_tokens`	Anthropic	Same

Docs examples use OpenAI-SDK tabs. For any open-source chat model, the Anthropic Messages API works equivalently: same models, same per-token billing, same rate limits. Specialized model APIs (Fast Apply, WarpGrep, Compact, Reflex) are OpenAI-format only. Auth accepts both conventions: Authorization: Bearer YOUR_API_KEY or x-api-key: YOUR_API_KEY.

Anthropic SDK (Python)
Anthropic SDK (TypeScript)
cURL

import anthropic

client = anthropic.Anthropic(
    api_key="YOUR_API_KEY",
    base_url="https://api.morphllm.com",
)

message = client.messages.create(
    model="morph-glm52-744b",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a tiny rate limiter in TS."}],
)
print(message.content[-1].text)  # last block: models may emit a thinking block first

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  apiKey: "YOUR_API_KEY",
  baseURL: "https://api.morphllm.com",
});

const message = await client.messages.create({
  model: "morph-glm52-744b",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Write a tiny rate limiter in TS." }],
});

curl -X POST "https://api.morphllm.com/v1/messages" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "morph-glm52-744b",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "Write a tiny rate limiter in TS."}]
  }'

Streaming, tools (tool_use / tool_result blocks), system prompts, and multi-turn history all work as the Anthropic API documents them. Model reasoning surfaces as thinking content blocks; a thinking request config maps to the models’ reasoning effort tiers (budgets under 8k → low, under 24k → medium, above → high). This is what makes Claude Code work natively with Morph models: point ANTHROPIC_BASE_URL at https://api.morphllm.com and go.

Claude Code

export ANTHROPIC_BASE_URL=https://api.morphllm.com
export ANTHROPIC_AUTH_TOKEN=YOUR_API_KEY
export ANTHROPIC_MODEL=morph-kimik3   # or morph-glm52-744b
claude

Everything Claude Code sends works on this endpoint: tool use, streaming, system params, multi-turn tool_result history. Verified against Claude Code v2.1.

The endpoint does not yet accept {"role": "system"} entries inside the messages array (Anthropic’s API folds them into the system prompt; we currently 400 with invalid message role: 'system'). Use the top-level system param instead. Claude Code itself only sends the top-level form, so the direct setup above works out of the box. If you wrap Claude Code behind a proxy that injects system messages, rewrite those entries to user until the server-side fix ships.

Get Started

Models

API Reference

Integrations

Claude Code

​Claude Code

Claude Code