Best AI Models for Long Context

Models ordered by advertised input context window, with their SI Score alongside so you can trade reach against quality.

updated Oct 9, 2026 · 15 models ranked

How this list is ranked: Ordered by the largest advertised input context window. Context figures are provider-published limits, not measured effective context; check each model's sources.

#	Model	Context	SI Score	Confidence	Price in	Context
1	Llama 4 Scout 17B Instruct Meta provisional	10M	51.0	64% confidence 64 percent, Medium	—	10M
2	GPT-5.4 OpenAI	1.1M	69.7	100% confidence 100 percent, Full	$2.50	1.1M
3	GPT-5.4 Pro OpenAI	1.1M	61.3	69% confidence 69 percent, Medium	$30.00	1.1M
4	GPT-5.5 OpenAI	1.1M	69.5	100% confidence 100 percent, Full	$5.00	1.1M
5	GPT-5.5 Pro OpenAI	1.1M	63.5	53% confidence 53 percent, Medium	$30.00	1.1M
6	GPT-5.6 Luna OpenAI provisional	1.1M	63.4	100% confidence 100 percent, Full	$0.20	1.1M
7	GPT-5.6 Sol OpenAI provisional	1.1M	72.1	100% confidence 100 percent, Full	$4.00	1.1M
8	GPT-5.6 Terra OpenAI provisional	1.1M	68.2	100% confidence 100 percent, Full	$2.00	1.1M
9	GPT-6 Astra OpenAI	1.1M	77.6	100% confidence 100 percent, Full	$10.00	1.1M
10	GPT-6 Luna OpenAI	1.1M	61.6	100% confidence 100 percent, Full	$0.10	1.1M
11	GPT-6 Sol OpenAI	1.1M	68.9	100% confidence 100 percent, Full	$2.00	1.1M
12	GPT-6.1 Sol OpenAI	1.1M	73.0	100% confidence 100 percent, Full	$2.00	1.1M
13	Gemini 2.5 Pro Google	1M	45.3	90% confidence 90 percent, High	$1.25	1M
14	Gemini 3 Flash Preview Google provisional	1M	54.8	93% confidence 93 percent, High	$0.50	1M
15	Gemini 3 Pro Preview Google provisional	1M	58.6	68% confidence 68 percent, Medium	—	1M

Task pages rank on one transparent metric, not the blended SI Score — see methodology for how pillars and confidence are computed. Missing values mean the source has not reported them.