GPT-6 Astra vs Claude Sonnet 5

Frontier against workhorse: whether GPT-6 Astra earns five times Sonnet 5's price on the work you actually send it.

What the numbers say

• Claude Sonnet 5 is about 5.0x cheaper on output tokens (120 vs 600 credits per 1M).
• GPT-6 Astra is the newer release (September 2026 vs June 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 Claude Sonnet 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-6 Astra and Claude Sonnet 5?

Claude Sonnet 5 is about 5.0x cheaper on output tokens (120 vs 600 credits per 1M). GPT-6 Astra is the newer release (September 2026 vs June 2026).

Is GPT-6 Astra or Claude Sonnet 5 cheaper?

Claude Sonnet 5 is cheaper: 120 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 Claude Sonnet 5?

GPT-6 Astra, at 1.1M tokens against 1M.

Can I use both GPT-6 Astra and Claude Sonnet 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-6 Astra and Claude Sonnet 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

• 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.
• Claude Opus 5.5 vs Claude Sonnet 5The current Anthropic tier decision: Opus 5.5 costs twice Sonnet 5 for an identical million-token window, so the question is entirely about depth per turn.
• 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-6 Sol vs Claude Sonnet 5Priced identically at $2 in and $10 out, five percent apart on context: the closest like-for-like comparison in the catalogue, and a genuine toss-up on price alone.
• 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.
• Grok 4.7 vs Claude Sonnet 5Grok 4.7 answers for roughly half Sonnet 5's output price; Sonnet 5 answers with twice the context. The trade is unusually clean.