Is DeepSeek V4 Flash or GPT-5.3 Codex cheaper?

DeepSeek V4 Flash is cheaper on output tokens ($0.18 vs $14.00 per 1M).

Which has the larger context window, DeepSeek V4 Flash or GPT-5.3 Codex?

DeepSeek V4 Flash has the larger context window (1M tokens).

DeepSeek V4 Flash vs GPT-5.3 Codex

DeepSeek V4 Flash is cheaper on output tokens, while DeepSeek V4 Flash offers a larger context window. Choose DeepSeek V4 Flash or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	DeepSeek V4 Flash	GPT-5.3 Codex
Provider	OpenRouter	OpenRouter
Input / 1M tokens	$0.09	$1.75
Output / 1M tokens	$0.18	$14.00
Context window	1M	400K
Parameters	284B	—
Open weights	Yes	No
Released	Apr 2026	Feb 2026

DeepSeek V4 Flash details →GPT-5.3 Codex details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.