GPT-5.6 Sol vs Grok Build 0.1

OpenAI's generalist flagship against a purpose-built coding model.

Figures as of 19 September 2026, read live from the model registry Zeplik bills against.

What the numbers say

• Grok Build 0.1 is about 10x cheaper on output tokens (24.0 vs 240 credits per 1M).
• GPT-5.6 Sol takes noticeably more context: 1.1M vs 256K tokens.
• GPT-5.6 Sol is the newer release (July 2026 vs May 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-5.6 Sol and Grok Build 0.1 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-5.6 Sol and Grok Build 0.1?

Grok Build 0.1 is about 10x cheaper on output tokens (24.0 vs 240 credits per 1M). GPT-5.6 Sol takes noticeably more context: 1.1M vs 256K tokens. GPT-5.6 Sol is the newer release (July 2026 vs May 2026).

Is GPT-5.6 Sol or Grok Build 0.1 cheaper?

Grok Build 0.1 is cheaper: 24.0 credits per million output tokens against 240. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.

Which has the larger context window, GPT-5.6 Sol or Grok Build 0.1?

GPT-5.6 Sol, at 1.1M tokens against 256K.

Can I use both GPT-5.6 Sol and Grok Build 0.1 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-5.6 Sol and Grok Build 0.1 need a paid plan?

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

Related comparisons

• GPT-6 Sol vs GPT-5.6 SolThe generational swap that also halves the bill: GPT-6 Sol replaces GPT-5.6 Sol at $2 in and $10 out, half what the model it supersedes now asks, on the same 1,050,000-token window.
• Grok 4.7 vs Grok Build 0.1xAI's newest generalist against its own coding specialist, which is cheaper per token but reads half the context.
• GPT-6 Astra vs GPT-5.6 SolThe upgrade decision almost every OpenAI user is actually making: GPT-6 Astra costs two and a half times GPT-5.6 Sol per token for the same 1,050,000-token window, so the question is which work is hard enough to need it.
• Grok Build 0.1 vs Kimi K2.7 CodeTwo dedicated coding models, xAI's Grok Build against Moonshot's Kimi Code.
• GPT-5.6 Sol vs Claude Sonnet 5The two defaults most people actually choose between: OpenAI's mainstream flagship against Anthropic's balanced current generation.
• Grok Build 0.1 vs Claude Sonnet 5A coding specialist against the general flagship engineers most often reach for.