[nicho810]

Adds cheapaimodel as an LLM provider. Mirrors #14 (Cheaper Inference): same files, same shape.

I work on cheapaimodel. It is an OpenAI-compatible Chat Completions gateway (tool calling supported), billed per token from a prepaid USD balance.

ChatCheapAIModel extends ChatOpenAI and only sets the base URL, the API key env var and the provider name.

Changes

• windows_use/providers/cheapaimodel/ — new ChatCheapAIModel class.
  • Base URL: https://api.cheapaimodel.ai/v1.
  • Key: CHEAPAIMODEL_API_KEY (keys start with sk-, created at https://console.cheapaimodel.ai/keys). Optional base URL override: CHEAPAIMODEL_API_BASE.
  • Default model: deepseek-v4-1-flash.
• windows_use/providers/__init__.py — export ChatCheapAIModel.
• windows_use/cli/registry.py — provider (right after Cheaper Inference), models, API key flag and display name.
• windows_use/cli/setup.py — create_llm branch and env var map entry.
• README.md — provider table row and a short usage example.
• tests/unit/providers/test_cheapaimodel.py — client defaults and CLI registry entries.

Model notes

• Models: deepseek-v4-1-flash, glm-5.3, glm-5.3-flash, kimi-k3, grok-4.7. Prices: https://cheapaimodel.ai/models
• glm-5.3 is text only; the other four, including the default deepseek-v4-1-flash, accept images, so the default works with use_vision=True.
• kimi-k3 only accepts temperature 1 or 0.6. The class keeps ChatOpenAI's default of not sending temperature, which works.

Testing

• python3 -m py_compile on all touched Python files — pass.

• ruff check and ruff format --check on the changed files — pass.

• I did not run pytest: I'm on macOS and did not install the Windows-only dependencies, so the new tests have not been executed yet.

• Live run of ChatCheapAIModel from this branch (loading windows_use.providers directly, Python 3.12, without the Windows-only packages), one call per case:

  Model	Text	Tool call (get_weather)	Image (ImageMessage)
  deepseek-v4-1-flash	ok	ok	ok
  glm-5.3	ok	ok	400 (text only)
  glm-5.3-flash	ok	ok	ok
  kimi-k3	ok	ok	ok
  grok-4.7	ok	ok	ok

  I didn't drive a real Windows desktop with the agent.