Compare AI models

Specifications
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider.
1M500k
API pricingUSD per 1M tokens · lower wins · base tier
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
$1.50$2.00
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
$7.50$6.00
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
$0.075$0.50
Cheapest inputLowest input rate across every provider on OpenRouter, the lab included. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page.
—$2.00xAI
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input.
—$6.00xAI
$675Google list price$700SpaceXSI list price
These models have no shared benchmark scores.
Overview
CompanyGoogleSpaceXSI
Release dateNov 12 2026Aug 12 2026
AccessClosedClosed
Model detailsView modelView model

Frequently asked questions

Gemini 4 Hydrogen and Grok 4.6 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 4 Hydrogen is cheaper on input: $1.50 vs $2.00 per million tokens. Grok 4.6 is cheaper on output: $6.00 vs $7.50 per million tokens. Figures are base-tier rates. Grok 4.6 shipped 92 days before Gemini 4 Hydrogen, so benchmark comparisons should account for the intervening progress.

Context windows are 1M (Gemini 4 Hydrogen) vs 500k (Grok 4.6).

Direct benchmark comparisons are unavailable — Gemini 4 Hydrogen and Grok 4.6 don't publish scores on any of the same benchmarks.