Is Gemini 3.5 Flash or GPT-5.3 Codex cheaper?

Gemini 3.5 Flash is cheaper on output tokens ($9.00 vs $14.00 per 1M).

Which has the larger context window, Gemini 3.5 Flash or GPT-5.3 Codex?

GPT-5.3 Codex has the larger context window (400K tokens).

Gemini 3.5 Flash vs GPT-5.3 Codex

Gemini 3.5 Flash is cheaper on output tokens, while GPT-5.3 Codex offers a larger context window. Choose Gemini 3.5 Flash or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Gemini 3.5 Flash	GPT-5.3 Codex
Provider	GitHub Copilot	GitHub Copilot
Input / 1M tokens	$1.50	$1.75
Output / 1M tokens	$9.00	$14.00
Context window	200K	400K
Parameters	—	—
Open weights	No	No
Released	May 2026	Feb 2026

Gemini 3.5 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.