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438db0c7b0
`_apply_model_switch_result` (the interactive `/model` picker's confirmation path) printed `ModelInfo.context_window` straight from models.dev, which reports the vendor-wide value (1.05M for gpt-5.5 on openai). ChatGPT Codex OAuth caps the same slug at 272K, so the picker showed 1M while the runtime (compressor, gateway `/model`, typed `/model <name>`) correctly used 272K — the classic 'sometimes 1M, sometimes 272K' mismatch on a single model. Both display paths now go through `resolve_display_context_length()`, matching the fix that `_handle_model_switch` received earlier. Also bump the stale last-resort fallback in DEFAULT_CONTEXT_LENGTHS (`gpt-5.5: 400000 -> 1050000`) to match the real OpenAI API value; the 272K Codex cap is already enforced via the Codex-OAuth branch, so the fallback now reflects what every non-Codex probe-miss should see. Tests: adds `test_apply_model_switch_result_context.py` with three scenarios (Codex cap wins, OpenRouter shows 1.05M, resolver-empty falls back to ModelInfo). Updates the existing non-Codex fallback test to assert 1.05M (the correct value). ## Validation | path | before | after | |-------------------------------|-----------|-----------| | picker -> gpt-5.5 on Codex | 1,050,000 | 272,000 | | picker -> gpt-5.5 on OpenAI | 1,050,000 | 1,050,000 | | picker -> gpt-5.5 on OpenRouter | 1,050,000 | 1,050,000 | | typed /model gpt-5.5 on Codex | 272,000 | 272,000 |