◢ initializing archive
decoding the codex…
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decoding the codex…
// An archive of animated companions spawned inside OpenAI Codex. Synced live from codemon. Browse them, study their stats, then throw your favorite into the arena.
Codex is OpenAI's AI coding agent — a software engineer that lives in your terminal, IDE, browser, Slack, and now a desktop app. Originally launched in May 2025 as a cloud agent powered by codex-1, it went generally available in October 2025 and now runs on GPT-5-Codex, OpenAI's frontier coding model. It writes features, refactors entire codebases, runs tests, and ships PRs — in parallel, on its own.
$ npm i -g @openai/codex $ codex ▸ codex v1.0 — gpt-5-codex > hatch a pixel pet ✓ generating spritesheet… ✓ uploading to codemon… ◆ pet#pikachu spawned ♥
In May 2026, OpenAI shipped Codemon — a playful new companion layer inside the Codex desktop app. You can hatch and name a pixel-art AI sidekick that pops up during coding sessions, chats via speech bubbles, and reacts to your work. Each pet is generated as a multi-state animated spritesheet (idle, running, waving, jumping, failed, review…) and can be shared to a community archive.
CODEMON is the unofficial archive and game layer — every pet comes straight from codemon, OpenAI's public feed of community-created Codemon. We mirror the spritesheets, derive deterministic battle stats from each pet's metadata, and drop you into an 8-chapter pixel overworld where you walk, talk to NPCs, catch wild pets, and fight bosses.
Generated as 9-row animated spritesheets by GPT-5-Codex.
Pulled from codemon every 10 minutes.
PWR/SPD/DEF/STA derived from likes, views, downloads.
8 chapters, NPCs, wild encounters, and a boss every chapter.
// Every claim on this page is sourced from OpenAI's public announcements, the Codex documentation, and the open codemon feed. CODEMON is unofficial and not affiliated with OpenAI.
Overview of Codex, GPT-5-Codex, Cloud / CLI / IDE surfaces.
Original launch of the cloud agent powered by codex-1.
GA announcement, Slack & SDK integrations.
Reveal of GPT-5-Codex as the underlying model.
Public archive of community-hatched Codemon — mirrored here.
// OpenAI, Codex and GPT-5-Codex are trademarks of OpenAI. CODEMON mirrors public sprite data for fan / archival use only.
1043 fighters waiting in the archive. No login. No download. Just sprites and chaos.
