GPT-6 Astra vs Claude Fable 5.1

Two models priced identically at $10 in and $50 out, aimed at opposite ends of the work: Astra's long-horizon engineering against Fable's literary voice.

What the numbers say

• Output pricing is close: 600 vs 600 credits per 1M tokens.
• GPT-6 Astra is the newer release (September 2026 vs September 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 Fable 5.1 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-6 Astra and Claude Fable 5.1?

Output pricing is close: 600 vs 600 credits per 1M tokens. GPT-6 Astra is the newer release (September 2026 vs September 2026).

Is GPT-6 Astra or Claude Fable 5.1 cheaper?

They cost the same on output tokens: 600 credits per million each. 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 Fable 5.1?

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

Can I use both GPT-6 Astra and Claude Fable 5.1 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-6 Astra and Claude Fable 5.1 need a paid plan?

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

Related comparisons

• 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 Fable 5.1A reversal worth knowing about: Anthropic's newest reasoning model now costs less than half its writing specialist, where the deepest model used to be the dearest.
• 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 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-6 Astra vs Claude Sonnet 5Frontier against workhorse: whether GPT-6 Astra earns five times Sonnet 5's price on the work you actually send it.