Engineering.

Use fetch, AbortController and a proper SSE parser to handle UTF-8, incomplete events, partial answers and connection failures in an LLM chat interface.

Use abliterated models through an API without managing GPUs: Uncensured AI endpoint, OpenAI Python SDK, DeepSeek and GLM IDs, costs and migration checks.

Use backoff with jitter, Retry-After, time budgets and concurrency limits to recover from temporary LLM API failures without multiplying traffic.