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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.
—256k
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.
—$1.00
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.
—$2.00
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.
—$0.20
—$300SpaceXSI list price
These models have no shared benchmark scores.
Overview
CompanyGoogleSpaceXSI
Release dateOct 28 2026Aug 28 2025
AccessClosedClosed
Model detailsView modelView model

Frequently asked questions

Gemini 4 Carbon and Grok Code Fast 1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only Grok Code Fast 1 has a verified first-party price for an available API: $1.00 per million input tokens and $2.00 per million output tokens. No currently available pay-as-you-go API rate is tracked for Gemini 4 Carbon. Grok Code Fast 1 shipped 426 days before Gemini 4 Carbon, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

Direct benchmark comparisons are unavailable — Gemini 4 Carbon and Grok Code Fast 1 don't publish scores on any of the same benchmarks.