The colon-split logic in get_model_context_length() and _query_local_context_length() assumed any colon meant provider:model format (e.g. "local:my-model"). But Ollama uses model:tag format (e.g. "qwen3.5:27b"), so the split turned "qwen3.5:27b" into just "27b" — which matches nothing, causing a fallback to the 2M token probe tier. Now only recognised provider prefixes (local, openrouter, anthropic, etc.) are stripped. Ollama model:tag names pass through intact. Co-authored-by: kshitijk4poor <82637225+kshitijk4poor@users.noreply.github.com>