Is GPT-4.1 or GPT-4o cheaper?

For a typical request (10,000 input + 2,000 output tokens), GPT-4.1 is cheaper — about 20% less, or roughly $900 saved per 100,000 requests. GPT-4.1 runs $2/$8 per 1M input/output tokens; GPT-4o runs $2.5/$10.

Which has the larger context window?

GPT-4.1, at 1,047,576 tokens versus 128,000.

How accurate are these token counts?

GPT-4.1: Exact tokenization via the canonical OpenAI vocab (o200k_base). GPT-4o: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.

GPT-4.1 vs GPT-4o: pricing & cost comparison

On input tokens, GPT-4.1 is the cheaper of the two — 20% less per million ($2 vs $2.5). On output, GPT-4.1 is 20% cheaper ($8 vs $10) — and since output is usually the dominant cost driver, that gap matters more than it looks.

Side by side

	GPT-4.1	GPT-4o
Input / 1M tokens	$2	$2.5
Output / 1M tokens	$8	$10
Context window	1,047,576	128,000
Token-count accuracy	exact	exact
Cost — 10,000 input + 2,000 output tokens	$0.036	$0.045

What a real request costs

Take a representative turn — 10,000 input + 2,000 output tokens. GPT-4.1 comes to $0.036, GPT-4o to $0.045. Across 100,000 requests that's a $900 swing in favour of GPT-4.1. To run the numbers on your actual prompt, paste it into the calculator and toggle Compare across all models.

Which should you pick?

Both are OpenAI models, so you can move between them without changing SDKs or re-tokenising — route the routine 80% of traffic to the cheaper one and reserve GPT-4o for the genuinely hard requests. See the full breakdown on the dedicated pages for GPT-4.1 and GPT-4o.

FAQ

Is GPT-4.1 or GPT-4o cheaper?: For a typical request (10,000 input + 2,000 output tokens), GPT-4.1 is cheaper — about 20% less, or roughly $900 saved per 100,000 requests. GPT-4.1 runs $2/$8 per 1M input/output tokens; GPT-4o runs $2.5/$10.
Which has the larger context window?: GPT-4.1, at 1,047,576 tokens versus 128,000.
How accurate are these token counts?: GPT-4.1: Exact tokenization via the canonical OpenAI vocab (o200k_base). GPT-4o: Exact tokenization via the canonical OpenAI vocab (o200k_base). The dollar math itself is exact once the token count is known.