ChatGPT Pro for $20/Month? Only Koreans Get This Deal

Two things landed in the same day that are worth covering separately, though they’re connected by the same Pro plan. Codex-5.3-Spark launched in the early hours of the morning. Hours earlier, a KakaoTalk Gift promotion appeared offering ChatGPT Pro at 29,000 KRW, roughly $20, against a regular price of $220 per month including tax. That’s an 87% discount on a plan that was previously out of reach for most individual users outside enterprise budgets.

Codex-5.3-Spark: 1,000 Tokens Per Second

Codex-5.3-Spark is the first real-world result of the OpenAI-Cerebras partnership announced earlier. It runs on Cerebras’ SRAM-based chips and outputs 1,000 tokens per second. Back-of-the-envelope estimates suggest a Mixture-of-Experts architecture with roughly 700B total parameters and 30B activation parameters.

The model is lighter than the original Codex-5.3. In practice, the speed difference is the most noticeable thing: iterative tasks that involved waiting now feel immediate. Whether the quality tradeoff is acceptable depends on the task. For straightforward code generation and refactoring, it holds up well. For complex multi-file reasoning, I’d reach for the heavier model. The activation efficiency is noticeably higher than GLM or Qwen in my testing. Access is currently limited to the Pro plan, with double credits running through end of April.

Pro Beyond Developers

The Codex App is designed to be accessible without coding experience, and a Windows app is expected soon. On the CLI side, general-purpose task accuracy has improved beyond debugging over the past two weeks of use. The potential as a general-purpose tool is real, though it still lacks Hook and Subagent support that Claude Code has. Updates are expected through February, but that gap is worth knowing before committing to a workflow that depends on those features.

The 29,000 KRW Pricing

The Plus plan already costs 29,000 KRW through mobile app store billing, with web subscriptions running higher due to additional tax. The KakaoTalk Gift promotion offers the Pro plan at that same price point. Each subscription has a 93-day validity, so you can’t chain five purchases into five consecutive months, but three to four months of Pro access at 29,000 KRW each is a meaningful window for anyone who wants to evaluate the plan seriously. The limit is five per person.

For context: Pro at full price is a significant ongoing expense that only makes sense for heavy users. At 29,000 KRW for 93 days, the calculus is different. The doubled credit period through late April extends the practical value further.

What This Period Is Good For

Since the Codex-5.3 launch, the developer community has been active with it, including engineers in Silicon Valley. Codex already supports Skill-based structures that Claude Code introduced, and experimental Subagent implementations are in progress. The combination of discounted access and doubled credits makes this a reasonable time to build familiarity with agent workflows if you’ve been waiting for a lower-cost entry point.

The discount window won’t last indefinitely, and 93-day validity means you need to start using it before the expiration to get value from the full period.