Adds `codex/` prefixed model support using the OpenAI Responses API —
the same protocol used by zeroclaw and other Codex-compatible tools.
Live-tested against gpt-5-mini-2025-08-07 with:
- Generate (non-streaming): confirmed working
- System prompt → instructions mapping: confirmed working
- SSE streaming: confirmed working (9 chunks)
- End-to-end via `jarvis ask`: confirmed working
Implementation:
- Default endpoint: api.openai.com/v1/responses (standard API key)
- Override via OPENAI_CODEX_BASE_URL for ChatGPT OAuth tokens
(e.g. chatgpt.com/backend-api/codex)
- Auth via OPENAI_CODEX_API_KEY env var
- Responses API format: input array, instructions field, output_text extraction
- Handles reasoning+message output blocks correctly
- SSE streaming parses response.output_text.delta events
Models: codex/gpt-4o, codex/gpt-4o-mini, codex/o3-mini,
codex/gpt-5-mini, codex/gpt-5-mini-2025-08-07
Usage:
export OPENAI_CODEX_API_KEY="your-api-key-or-oauth-token"
jarvis ask "Hello" --model codex/gpt-5-mini-2025-08-07
Closes#134
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
