Nemotron 3.5 LightningvsGPT-5-Codex
Nemotron 3.5 Lightning | GPT-5-Codex | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | 30B | — |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 1M | — |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $0.08DeepInfra | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $0.20DeepInfra | — |
| BenchmarksPublished by one model only | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 39% |
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 51.6% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.4% | — |
| Overview | ||
| Company | NVIDIA | OpenAI |
| Release date | Aug 11 2026 | Sep 15 2025 |
| Access | Open Source | Proprietary |
Other comparisons
Nemotron 3.5 LightningvsClaude Fable 5.1GPT-5-CodexvsClaude Fable 5.1Nemotron 3.5 LightningvsGemini 3.8 FlashGPT-5-CodexvsGemini 3.8 FlashNemotron 3.5 LightningvsMuse Spark 1.3GPT-5-CodexvsMuse Spark 1.3Nemotron 3.5 LightningvsGrok 4.6GPT-5-CodexvsGrok 4.6Nemotron 3.5 LightningvsDeepSeek-V4-Pro-0813GPT-5-CodexvsDeepSeek-V4-Pro-0813Nemotron 3.5 LightningvsMistral Medium 3.5GPT-5-CodexvsMistral Medium 3.5
Frequently asked questions
Nemotron 3.5 Lightning and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex shipped 330 days before Nemotron 3.5 Lightning, so benchmark comparisons should account for the intervening progress.
Nemotron 3.5 Lightning is open source, while GPT-5-Codex is proprietary.
Direct benchmark comparisons are unavailable — Nemotron 3.5 Lightning and GPT-5-Codex don't publish scores on any of the same benchmarks.
Nemotron 3.5 Lightning was released by NVIDIA on Aug 11 2026.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
Nemotron 3.5 Lightning is an open source model released by NVIDIA. GPT-5-Codex is a proprietary model released by OpenAI.