TL;DR
Jack Roberts shows how to integrate OpenAI Codex (ChatGPT) and Google Gemini CLI directly into Claude Code to compensate for Claude's recent performance regression. The setup uses a free 'three brain auto-router' skill so Claude automatically delegates tasks to the best model — Gemini for video/audio/PDF analysis, Codex for code review — without manual prompting.
Key points
1
Claude Code has measurably degraded in performance recently, which Anthropic acknowledged around April 23rd, prompting the need for a multi-model workaround
2
Gemini 2.5 Pro can be integrated for free (1,500 flash + 50 pro requests/day) and handles native video input up to 2 hours, audio up to ~10 hours, and 200+ page PDFs with a 1M token context window
3
OpenAI Codex CLI integrates with your existing ChatGPT subscription ($20/month gives ~50 GPT-4.5 messages per 3 hours) at no extra API cost, and acts as an adversarial code reviewer
4
A downloadable 'three brain auto-router' skill file automatically routes tasks: Claude builds, Codex reviews code and rescues failed attempts, Gemini handles media and long-context inputs
5
The hard-stop rule in the skill prevents Claude from looping endlessly on errors — if it fails twice, it automatically hands off to Codex for rescue
Actionable insights
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Install both tools via terminal: 'npm install openai codex' and the Gemini CLI, then authenticate each with 'codex login' and 'gemini' commands using existing accounts
→
Install the Codex and Gemini Claude Code plugins (two GitHub repos) and reload plugins inside Claude to make both models accessible within any Claude Code session
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Download the free three-brain skill MD file, drop it into your project, and tell Claude to 'familiarize yourself with this and add it to your skills' to activate automatic model routing
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Use Codex specifically for adversarial code review after Claude generates output — it provides high/medium/low severity breakdowns of real issues Claude missed
→
Use Gemini for any task involving video analysis, large PDFs, or long audio — feed it content and combine visual overlay analysis with transcript for richer outputs than Claude alone can provide
Notable quotes
“People thought they were ordering Albert Einstein and Forest Gump turned up at the doorstep.”
“The big problem with Claude is that when it gets something wrong, it doesn't recognize that it's actually getting it wrong. So you can sit there and it's stuck in like a roundabout loop.”
“I wouldn't pay a single dollar bill for any of this visual overlay analysis that just went all the way through Gemini.”
Worth watching?
⏭️
Worth watching the full video?
The setup steps and key concepts are all captured here — watch only if you want to see the live terminal installation walkthrough or the Gemini video analysis demo in action.
Saved you some time? The creator still deserves a like.
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