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Specifications
ParametersThe learned values that shape how a model responds. B means billion and T means trillion. For mixture-of-experts models, the total count is larger than the number active for each token. Parameter count alone does not measure quality.
8B—
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.
64k400k
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.
—$1.25Azure
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input.
—$10.00Azure
—$750Azure
Overview
CompanyNVIDIAOpenAI
Release dateOct 23 2026Nov 19 2025
AccessOpen WeightClosed
Model detailsView modelView model

Other comparisons

Nemotron 3.5 Bolt E4B 4GBvsClaude Haiku 5.5GPT-5.1-Codex-MaxvsClaude Haiku 5.5Nemotron 3.5 Bolt E4B 4GBvsGemini 4 ArgonGPT-5.1-Codex-MaxvsGemini 4 ArgonNemotron 3.5 Bolt E4B 4GBvsMuse Spark OpenGPT-5.1-Codex-MaxvsMuse Spark OpenNemotron 3.5 Bolt E4B 4GBvsGrok 4.7GPT-5.1-Codex-MaxvsGrok 4.7Nemotron 3.5 Bolt E4B 4GBvsDeepSeek-V4.1-Flash-1017GPT-5.1-Codex-MaxvsDeepSeek-V4.1-Flash-1017Nemotron 3.5 Bolt E4B 4GBvsMistral Large 4GPT-5.1-Codex-MaxvsMistral Large 4

Frequently asked questions

Nemotron 3.5 Bolt E4B 4GB 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 338 days before Nemotron 3.5 Bolt E4B 4GB, so benchmark comparisons should account for the intervening progress.

Context windows are 64k (Nemotron 3.5 Bolt E4B 4GB) vs 400k (GPT-5.1-Codex-Max). Nemotron 3.5 Bolt E4B 4GB is open weight, while GPT-5.1-Codex-Max is closed.

Direct benchmark comparisons are unavailable — Nemotron 3.5 Bolt E4B 4GB and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.