[breaking] OpenAI deprecates GPT-5-era chat/codex variants and preview models, shutdown July 2026

The first wave of the April 22, 2026 legacy-snapshot deprecation shuts down July 23, 2026: gpt-5/5.1 chat-latest and codex variants (including gpt-5.2-codex), computer-use/search/tts previews, deep-research models, and 2025-10-06 audio/realtime mini snapshots. Substitutes are mostly gpt-5.5, gpt-5.4-mini, and gpt-5.5-pro per model. Effective: 2026-07-23. Affected: openai/computer-use-preview, openai/computer-use-preview-2025-03-11, openai/gpt-4o-mini-search-preview-2025-03-11, openai/gpt-4o-mini-tts-2025-03-20, openai/gpt-4o-search-preview-2025-03-11, openai/gpt-5-chat-latest, openai/gpt-5-codex, openai/gpt-5.1-chat-latest, openai/gpt-5.1-codex, openai/gpt-5.1-codex-max, openai/gpt-5.1-codex-mini, openai/gpt-audio-mini-2025-10-06, openai/gpt-realtime-mini-2025-10-06, openai/o3-deep-research, openai/o3-deep-research-2025-06-26, openai/o4-mini-deep-research, openai/o4-mini-deep-research-2025-06-26, openai/gpt-5.2-codex. Severity: breaking. Verification: verified.