Is Gemini 2.5 Flash or GPT-5 Mini cheaper?

For a typical request (10,000 input + 2,000 output tokens), GPT-5 Mini is cheaper — about 19% less, or roughly $150 saved per 100,000 requests. Gemini 2.5 Flash runs $0.3/$2.5 per 1M input/output tokens; GPT-5 Mini runs $0.25/$2.

Which has the larger context window?

Gemini 2.5 Flash, at 1,000,000 tokens versus 400,000.

How accurate are these token counts?

Gemini 2.5 Flash: Approximated with o200k_base; drift typically ~3% on English and code. GPT-5 Mini: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.

Gemini 2.5 Flash vs GPT-5 Mini: pricing & cost comparison

On input tokens, GPT-5 Mini is the cheaper of the two — 17% less per million ($0.3 vs $0.25). On output, GPT-5 Mini is 20% cheaper ($2.5 vs $2) — and since output is usually the dominant cost driver, that gap matters more than it looks.

Side by side

	Gemini 2.5 Flash	GPT-5 Mini
Input / 1M tokens	$0.3	$0.25
Output / 1M tokens	$2.5	$2
Context window	1,000,000	400,000
Token-count accuracy	±3%	exact
Cost — 10,000 input + 2,000 output tokens	$0.008	$0.0065

What a real request costs

Take a representative turn — 10,000 input + 2,000 output tokens. Gemini 2.5 Flash comes to $0.008, GPT-5 Mini to $0.0065. Across 100,000 requests that's a $150 swing in favour of GPT-5 Mini. To run the numbers on your actual prompt, paste it into the calculator and toggle Compare across all models.

Which should you pick?

These are different vendors, so a switch means a different API and a slightly different tokenizer — budget a small calibration buffer. GPT-5 Mini give exact counts; the others land within a few percent. See the full breakdown on the dedicated pages for Gemini 2.5 Flash and GPT-5 Mini.

FAQ

Is Gemini 2.5 Flash or GPT-5 Mini cheaper?: For a typical request (10,000 input + 2,000 output tokens), GPT-5 Mini is cheaper — about 19% less, or roughly $150 saved per 100,000 requests. Gemini 2.5 Flash runs $0.3/$2.5 per 1M input/output tokens; GPT-5 Mini runs $0.25/$2.
Which has the larger context window?: Gemini 2.5 Flash, at 1,000,000 tokens versus 400,000.
How accurate are these token counts?: Gemini 2.5 Flash: Approximated with o200k_base; drift typically ~3% on English and code. GPT-5 Mini: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.