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.
1M400k
API pricingUSD per 1M tokens · lower wins
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.
$1.25Meta$1.25Azure
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input.
$4.25Meta$10.00Azure
$463Meta$750Azure
These models have no shared benchmark scores.
Overview
CompanyMetaOpenAI
Release dateSep 2 2026Nov 19 2025
AccessClosedClosed
Model detailsView modelView model

Frequently asked questions

Muse Spark 1.3 and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.1-Codex-Max shipped 287 days before Muse Spark 1.3, so benchmark comparisons should account for the intervening progress.

Context windows are 1M (Muse Spark 1.3) vs 400k (GPT-5.1-Codex-Max).

Direct benchmark comparisons are unavailable — Muse Spark 1.3 and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.