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 — Anthropic
Claude Opus 5.5 is Anthropic's model for long-running agentic coding and knowledge work, released on September 22, 2026, and the model Anthropic recommends starting with for most workloads. It takes text and image input, returns text, and its thinking cannot be disabled.
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 | Claude Opus 5.5 | NVIDIA Nemotron 3 Ultra |
|---|---|---|
| Released | Sep 22, 2026 | Jun 4, 2026 |
| Developer | Anthropic | NVIDIA |
| Type | reasoning | reasoning |
| License | proprietary | open-weight |
| Context window | — | 1,048,576 |
| Parameters | — | 550B total, 55B active (LatentMoE: Mamba-2 + MoE + attention hybrid) |
| Developer status | — | — |
| Input $/M tokens | $4.00 | — |
| Output $/M tokens | $20.00 | — |
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.
No exclusive capabilities
Programmatic access available at /api/ai/compare?a=claude-opus-5-5&b=nemotron-3-ultra. CORS is open. Citation guidance: /about/editorial-process.