GPT-5.6 Sol vs Claude Opus 5

The new head-to-head at the very top: OpenAI's flagship against Anthropic's million-token Opus 5 premium tier.

What the numbers say

• GPT-5.6 Sol is about 2.5x cheaper on output tokens (120 vs 300 credits per 1M).
• Claude Opus 5 is the newer release (July 2026 vs July 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 Claude Opus 5 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 Claude Opus 5?

GPT-5.6 Sol is about 2.5x cheaper on output tokens (120 vs 300 credits per 1M). Claude Opus 5 is the newer release (July 2026 vs July 2026).

Is GPT-5.6 Sol or Claude Opus 5 cheaper?

GPT-5.6 Sol is cheaper: 120 credits per million output tokens against 300. 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 Claude Opus 5?

GPT-5.6 Sol, at 1.1M tokens against 1M.

Can I use both GPT-5.6 Sol and Claude Opus 5 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 Claude Opus 5 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 with no price to argue about: GPT-6 Sol replaces GPT-5.6 Sol at an identical $2 in and $10 out, with the same 1,050,000-token window.
• Claude Opus 5.5 vs Claude Opus 5The rare upgrade with nothing to weigh: Opus 5.5 is newer than Opus 5 and twenty percent cheaper on both input and output, at the same million-token window.
• 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.
• GPT-6 Astra vs Claude Opus 5The new top-tier head-to-head: OpenAI's GPT-6 flagship against Anthropic's deepest model, which asks half the price for a comparable million-token window.
• 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.
• Claude Opus 5 vs Claude Sonnet 5The Anthropic tier decision one generation back: whether Opus 5's depth and million-token window justify two and a half times Sonnet's price.