GPT-5.6 Sol vs Grok 4.20
Grok 4.20 is cheaper on output tokens ($2.5 vs $15 per 1M), and Grok 4.20 has the larger context window (2M). The best choice depends on your task — and with Vincony you don't have to pick just one.
| Spec | GPT-5.6 Sol | Grok 4.20 |
|---|---|---|
| Provider | OpenAI | xAI |
| Context window | 1.1M | 2M |
| Input price /1M | $2.5 | $1.25 |
| Output price /1M | $15 | $2.5 |
| Input | file, image, text | text, image, file |
Prices are per 1M tokens, indicative pricing via OpenRouter (updated 2026-08-22); a provider's own list price may differ. Highlighted cells mark the cheaper price / larger context.
Frequently asked questions
Is GPT-5.6 Sol or Grok 4.20 cheaper?
Grok 4.20 is cheaper on output tokens ($2.5 vs $15 per 1M). Input is $1.25 vs $2.5.
Which has a bigger context window, GPT-5.6 Sol or Grok 4.20?
Grok 4.20 has the larger context window at 2M tokens, versus 1.1M for the other.
Can I use both GPT-5.6 Sol and Grok 4.20 in one place?
Yes. Vincony aggregates 800+ models — including GPT-5.6 Sol and Grok 4.20 — into one interface with Compare Chat, so you can send the same prompt to both and compare outputs side by side on a single credit-based plan.