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Spec / Metric	Mercury 2 Inception	GPT-5 Nano OpenAI
Provider	Inception	OpenAI
Context Window	128,000	400,000
Input Price / 1M	$0.250000	$0.050000 ★
Output Price / 1M	$0.750000	$0.400000 ★
Est. Cost / Month (1000 rpd)	$18.75	$7.50 ★
Modalities	text	text, image, file

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Flagship frontier: GPT vs Claude vs Gemini Budget workhorses: Strong models under ~$1/1M in Free tier: Zero-cost endpoints

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