Is Gemini 2.5 Flash or GPT-5.3 Codex cheaper?

Gemini 2.5 Flash is cheaper on output tokens ($2.50 vs $14.00 per 1M).

Which has the larger context window, Gemini 2.5 Flash or GPT-5.3 Codex?

Gemini 2.5 Flash has the larger context window (1M tokens).

Gemini 2.5 Flash vs GPT-5.3 Codex

Gemini 2.5 Flash is cheaper on output tokens, while Gemini 2.5 Flash offers a larger context window. Choose Gemini 2.5 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 2.5 Flash	GPT-5.3 Codex
Provider	LLM Gateway	LLM Gateway
Input / 1M tokens	$0.30	$1.75
Output / 1M tokens	$2.50	$14.00
Context window	1M	400K
Parameters	—	—
Open weights	No	No
Released	Jun 2025	Feb 2026

Gemini 2.5 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.