Swapping Codex to Kimi K3: 1/4 the Cost of GPT-5.6 for Marketing Plans, Minor Quality Drop
AskItAll_Biych · reddit · 2026-08-04
The author tested GPT-5.6 against Kimi K3 within the Codex environment to process a 40-file marketing plan.
- Cost & Time: GPT-5.6 took 6 mins, used 85k tokens, and cost $0.74. K3 took 9 mins, used 92k tokens, and cost $0.19 (roughly 1/4 the price).
- Quality: K3 read all files without truncation but required 4 manual corrections (e.g., misreading ROAS, missing a paused campaign), compared to just 1 correction for GPT-5.6.
The author concludes K3 is highly cost-effective for internal drafts requiring review, though a stronger model is preferred for direct client deliverables.
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