Integrating DeepSeek-V4-Flash into Codex: Costs 89x Less Than Opus
teortaxesTex · x · 2026-07-31
A developer shared a practical workflow for integrating DeepSeek-V4-Flash into Codex. Since the official native integration forcibly overrides and hides existing GPT models, the author recommends using the Codex Router to enable multi-model coexistence.
- Tool Setup: Codex Router allows you to keep native GPT models while adding Grok, Kimi, and DeepSeek to the same picker for flexible switching.
- Cost Gap: DeepSeek V4-Flash is priced at $0.28 per million output tokens, compared to $25 for Opus 4.8—an 89x difference.
- Real-world Audit: For a monthly coding workload consuming 9.28B tokens with a 97.5% cache replay rate, switching from Opus (which would cost $6,200) to V4-Flash reduces the bill to just $64.
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