AI Model Comparison
Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Every figure comes from the developer's own pages, last checked on ; each model's page lists its sources. A figure we could not source shows as a dash.
Model A — OpenAI
GPT-6 Astra is a reasoning model from OpenAI, released in the API on September 3, 2026, which OpenAI describes as its most capable API model for complex reasoning, coding, computer use, research and document creation. It takes text and image input, returns text, and has an April 30, 2026 knowledge cutoff.
Model B — NVIDIA
Nemotron 3 Ultra is an open-weight language model from NVIDIA, released on June 4, 2026, which NVIDIA describes as frontier-scale, with 550B total and 55B active parameters in a hybrid Mamba-2, mixture-of-experts and attention architecture. It produces a reasoning trace before its answer and supports up to 1M tokens of context.
| Property | GPT-6 Astra | NVIDIA Nemotron 3 Ultra |
|---|---|---|
| Released | Sep 3, 2026 | Jun 4, 2026 |
| Developer | OpenAI | NVIDIA |
| Type | reasoning | reasoning |
| License | proprietary | open-weight |
| Context window | 1,050,000 | 1,048,576 |
| Parameters | — | 550B total, 55B active (LatentMoE: Mamba-2 + MoE + attention hybrid) |
| Developer status | — | — |
| Input $/M tokens | $10.00 | — |
| Output $/M tokens | $50.00 | — |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins). Prices are the ones each developer lists today; a model it no longer prices has none.
Programmatic access available at /api/ai/compare?a=gpt-6-astra&b=nemotron-3-ultra. CORS is open. Citation guidance: /about/editorial-process.