ChatGPT Plus / Pro
$20 / $100–500 per mo
Models: OpenAI only (incl. Codex)
What "flat" means: Fixed price. Plus has a five-hour window (an estimated 15 to 160 GPT-6.1 Sol messages) and a weekly limit; Pro has no five-hour limit but still caps usage weekly. Codex local and cloud tasks share one allowance.
The catch: OpenAI models only, and weekly limits aren't published; parallel Codex tasks drain the shared allowance fast. Other agents can use the plan only through the Sign in with ChatGPT preview for open-source apps.
Pick ChatGPT Plus / Pro when
+You want the ChatGPT product itself alongside the coding agent
+OpenAI's cloud Codex tasks and managed sandboxes matter to your workflow
+OpenAI's GPT-6 models are your preference and the plan limits fit your volume
DevPass
$29 / $79 / $179 per mo
Models: 200+ models via gateway
What "flat" means: Fixed price buying 2x its value in usage metered at provider rates (Lite about $58, Pro $158, Max $358 since Oct 15, 2026; 3x before).
The catch: A capped value multiplier with pacing caps: a rolling 24-hour cap (8 to 10% of the monthly allowance) and a weekly premium-model cap (10 to 15%). Since Oct 15, 2026, licensed for interactive coding-agent use only.
Pick DevPass when
+Your monthly usage is predictable and fits inside the 2x multiple
+You want to pin specific models across 200+ options, including Anthropic-format for Claude Code
+Provider-rate metering transparency matters to you