GPT-6 Astra vs Grok 4.6

The GPT-6 flagship against xAI's current top model, at roughly eight times the output price and twice the context.

What the numbers say

• Grok 4.6 is about 8.3x cheaper on output tokens (72.0 vs 600 credits per 1M).
• GPT-6 Astra takes noticeably more context: 1.1M vs 500K tokens.
• GPT-6 Astra is the newer release (September 2026 vs August 2026).

Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Side by side

Try both on Zeplik

The honest answer to most model debates is to run your own prompt on both. Zeplik puts GPT-6 Astra and Grok 4.6 in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.

Frequently asked questions

What is the difference between GPT-6 Astra and Grok 4.6?

Grok 4.6 is about 8.3x cheaper on output tokens (72.0 vs 600 credits per 1M). GPT-6 Astra takes noticeably more context: 1.1M vs 500K tokens. GPT-6 Astra is the newer release (September 2026 vs August 2026).

Is GPT-6 Astra or Grok 4.6 cheaper?

Grok 4.6 is cheaper: 72.0 credits per million output tokens against 600. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Which has the larger context window, GPT-6 Astra or Grok 4.6?

GPT-6 Astra, at 1.1M tokens against 500K.

Can I use both GPT-6 Astra and Grok 4.6 on Zeplik?

Yes. Zeplik is a multi-model chat, so both sit behind one account and you can switch between them mid-conversation to compare answers on your own prompt.

Do GPT-6 Astra and Grok 4.6 need a paid plan?

Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.

Related comparisons

• Claude Opus 5.5 vs GPT-6 AstraAnthropic's and OpenAI's deep-reasoning flagships, eighteen days apart -- and Astra asks two and a half times Opus 5.5's price for a window only five percent larger.
• Grok 4.7 vs Grok 4.6The newest Grok against the one it replaces: twenty percent cheaper on both input and output, with the same 500,000-token window.
• GPT-6 Sol vs GPT-6 AstraThe upgrade decision inside the GPT-6 line: Astra costs five times Sol for the same 1,050,000-token window, so the question is which work is hard enough to need it.
• GPT-5.6 Sol vs Grok 4.6The GPT flagship against xAI's current top model.
• GPT-6 Astra vs GPT-5.6 SolThe upgrade decision almost every OpenAI user is actually making: GPT-6 Astra costs five times Sol per token for the same 1,050,000-token window, so the question is which work is hard enough to need it.
• Claude Sonnet 5 vs Grok 4.6Anthropic's balanced flagship against Grok 4.6, at the same tier of the market.