Claude Mythos 5vsNemotron 3.5 Lightning
Claude Mythos 5 | Nemotron 3.5 Lightning | |
|---|---|---|
| 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 | 1M |
| Benchmarks | ||
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. | 95.5% | 51.6% |
| BenchmarksPublished by one model only | ||
Terminal-Bench 2.0Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | 88% | — |
BrowseCompWeb browsing — Can the AI browse the web and track down hard-to-find answers? Higher is better. | 88% | — |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | 64.5% | — |
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% |
OSWorld-VerifiedAgentic computer use — Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 85% | — |
| Overview | ||
| Company | Anthropic | NVIDIA |
| Release date | Jun 9 2026 | Aug 11 2026 |
| Access | Proprietary | Open Source |
Other comparisons
Frequently asked questions
Claude Mythos 5 leads Nemotron 3.5 Lightning on 1 of the 1 benchmark they both report (SWE-Bench Verified). Claude Mythos 5 shipped 63 days before Nemotron 3.5 Lightning, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Claude Mythos 5) vs 1M (Nemotron 3.5 Lightning). Claude Mythos 5 is proprietary, while Nemotron 3.5 Lightning is open source.
On SWE-Bench Verified, Claude Mythos 5 leads at 95.5% vs Nemotron 3.5 Lightning at 51.6%.
Claude Mythos 5 was released by Anthropic on Jun 9 2026.
Nemotron 3.5 Lightning was released by NVIDIA on Aug 11 2026.
Claude Mythos 5 leads on SWE-Bench Verified — Claude Mythos 5 95.5% vs Nemotron 3.5 Lightning 51.6%.
Claude Mythos 5 has a 1M context window; Nemotron 3.5 Lightning has 1M.
Claude Mythos 5 is a proprietary model released by Anthropic. Nemotron 3.5 Lightning is an open source model released by NVIDIA.