SDKs and AI tools

Almost every SDK and AI tool supports OpenAI- or Anthropic-compatible APIs. Fill in three things: base URL, API key, and model ID.

Three settings

Setting	Value
Base URL	`https://api.markas.ai.id/v1` for the OpenAI format. `https://api.markas.ai.id` (without `/v1`) for the Anthropic format.
API key	An `mt-...` key from the dashboard.
Model	An `id` from the Models page or `GET /v1/models`.

Also set the output token limit and context window in the tool to match the model's max_output_tokens and context_length. Tools that send no max_tokens make the balance hold use the model limit, so a small balance can be rejected with 402.

SDKs and frameworks

SDK	Setting
OpenAI Python	`OpenAI(base_url="https://api.markas.ai.id/v1", api_key=...)`
OpenAI Node.js	`new OpenAI({ baseURL: "https://api.markas.ai.id/v1", apiKey })`
Anthropic Python	`anthropic.Anthropic(base_url="https://api.markas.ai.id", api_key=...)`
Anthropic Node.js	`new Anthropic({ baseURL: "https://api.markas.ai.id", apiKey })`
LangChain (Python)	`ChatOpenAI(model="MODEL_ID", base_url="https://api.markas.ai.id/v1", api_key=...)`
LangChain.js	`new ChatOpenAI({ model: "MODEL_ID", apiKey, configuration: { baseURL: "https://api.markas.ai.id/v1" } })`
LlamaIndex	`OpenAILike(model="MODEL_ID", api_base="https://api.markas.ai.id/v1", api_key=..., is_chat_model=True)`
Vercel AI SDK	`createOpenAICompatible({ name: "markasai", baseURL: "https://api.markas.ai.id/v1", apiKey })`

Many tools read the standard OpenAI SDK environment variables:

Terminal

export OPENAI_BASE_URL="https://api.markas.ai.id/v1"
export OPENAI_API_KEY="$MARKASAI_API_KEY"

AI tools for developers

Tool	Format	Notes
Cursor	OpenAI	Override OpenAI Base URL in Settings, Models. Chat and Agent use MarkasAI models; Tab stays on Cursor's model.
Claude Code	Anthropic	Unofficial: built for Claude models. See the environment variables below.
Codex CLI	Responses	Custom provider in `~/.codex/config.toml` with `wire_api = "responses"`.
Cline, Roo Code, Kilo Code	OpenAI	Pick the OpenAI Compatible provider.
Continue, OpenCode, Zed	OpenAI	OpenAI provider with a custom base URL in the tool's config file.
Aider	OpenAI	`OPENAI_API_BASE` and `OPENAI_API_KEY` variables, model with the `openai/` prefix.
Open WebUI	OpenAI	Add an OpenAI connection in the Connections menu.
OpenClaw, Hermes Agent	OpenAI or Anthropic	Custom provider in the tool's config file.

Claude Code

Terminal

export ANTHROPIC_BASE_URL="https://api.markas.ai.id"
export ANTHROPIC_AUTH_TOKEN="$MARKASAI_API_KEY"
export ANTHROPIC_MODEL="MODEL_ID"
export ANTHROPIC_DEFAULT_HAIKU_MODEL="SMALL_MODEL_ID"
export CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1
claude

Codex CLI

~/.codex/config.toml

model = "MODEL_ID"
model_provider = "markasai"

[model_providers.markasai]
name = "MarkasAI"
base_url = "https://api.markas.ai.id/v1"
env_key = "MARKASAI_API_KEY"
wire_api = "responses"

If Codex does not know the model ID, add model_context_window and model_max_output_tokens from /v1/models to the provider block.

Common symptoms

Symptom	Cause and fix
`404` on `/v1/v1/...`	Anthropic tools append `/v1` themselves. Use the base URL without `/v1`.
`404` on `/chat/completions`	The OpenAI base URL is missing `/v1`.
The tool rejects the key (expects `sk-...`)	Use an OpenAI Compatible option or a custom provider that does not check the key prefix.
CORS or Failed to fetch in a web app	Browser calls are unsupported. Call from your server.
The stream stops midway	A proxy, VPN, or antivirus is buffering SSE. Turn buffering off, or try without streaming.