GPT-5.6 vs Grok-4.6: API Pricing Compared
Side-by-side API pricing and capabilities for GPT-5.6 and Grok-4.6. Both are available through Riven behind one OpenAI-compatible endpoint — at vendor list price with transparent per-token pricing, or a flat $3 per million tokens on pay-as-you-go.
| GPT-5.6 | Grok-4.6 | |
|---|---|---|
| Input price ($/1M tokens) | $5.00 | $2.00 |
| Output price ($/1M tokens) | $30.00 | $6.00 |
| Vendor | provider | xai |
| Capabilities | chat, reasoning | chat, reasoning, coding, vision |
Model pages: GPT-5.6 · Grok-4.6
FAQ
Which is cheaper, GPT-5.6 or Grok-4.6?
On Riven both are billed at vendor list price with transparent per-token pricing: GPT-5.6 is $5.00/1M input and $30.00/1M output; Grok-4.6 is $2.00/1M input and $6.00/1M output. On the pay-as-you-go plan, every model is a flat $3 per million tokens.
Can I use GPT-5.6 and Grok-4.6 with one API key?
Yes. One Riven key reaches both models through the same OpenAI-compatible endpoint, so you can A/B them by changing only the model id.
Is there a markup on these prices?
No. Riven lists these models at vendor list price with transparent per-token pricing. Pay-as-you-go users instead pay a flat $3 per million tokens across every model.