Problem

GPT-5.5 has been released, but hermes-agent does not recognize or route it correctly. The model is absent from the provider catalog, the Codex image-gen plugin still defaults to gpt-5.4, tests reference the old model, and documentation shows outdated model names.

Current Behavior

• hermes_cli/models.py: gpt-5.5 is not listed in VERCEL_AI_GATEWAY_MODELS, not registered under _PROVIDER_MODELS for the openai, copilot, opencode-zen, or kilocode providers, and not included in _PRIORITY_PROCESSING_MODELS.
• plugins/image_gen/openai-codex/__init__.py: _CODEX_CHAT_MODEL defaults to gpt-5.4, so Codex image-gen requests use a stale model.
• tests/gateway/test_fast_command.py: Monkeypatched _resolve_gateway_model stubs return gpt-5.4, so gateway routing tests do not cover the current model.
• tests/plugins/image_gen/test_openai_codex_provider.py: Model assertion expects gpt-5.4.
• website/docs/integrations/providers.md: CLI examples and config default reference gpt-5.4.
• website/docs/reference/faq.md: /model example shows gpt-5.4.

Expected Behavior

• gpt-5.5 is recognized by the Vercel AI gateway and registered for all supported providers (openai, copilot, opencode-zen, kilocode).
• gpt-5.5 is in the priority processing set so requests are handled with the correct routing path.
• Codex image-gen plugin uses gpt-5.5 as its chat model.
• Tests assert against gpt-5.5.
• Documentation reflects gpt-5.5 as the current default.

Affected Files

• hermes_cli/models.py
• plugins/image_gen/openai-codex/__init__.py
• tests/gateway/test_fast_command.py
• tests/plugins/image_gen/test_openai_codex_provider.py
• website/docs/integrations/providers.md
• website/docs/reference/faq.md

Related Issues

• gpt-5.4 shows 32k context in Hermes instead of 1,050,000 #5173 — prior model list normalization
• GPT-5.4 via openai-codex fails in normal mode with 'Empty/malformed response' fallback #5883 — provider model registration tracking
• [Bug] openai-codex provider returns empty response.output from agent loop on multiple gpt-5.x models (works in isolated direct call) #5736 — priority processing model set
• [Bug]: hermes update runs npm install instead of npm ci, dirtying package-lock.json after every update #4048 — Codex image-gen provider