GPT-5.6 Sol vs Claude Fable 5

OpenAI's flagship against Anthropic's writing-and-reasoning specialist from the same release wave.

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

What the numbers say

• GPT-5.6 Sol is about 2.5x cheaper on output tokens (240 vs 600 credits per 1M).
• GPT-5.6 Sol is the newer release (July 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-5.6 Sol and Claude Fable 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 Fable 5?

GPT-5.6 Sol is about 2.5x cheaper on output tokens (240 vs 600 credits per 1M). GPT-5.6 Sol is the newer release (July 2026 vs June 2026).

Is GPT-5.6 Sol or Claude Fable 5 cheaper?

GPT-5.6 Sol is cheaper: 240 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-5.6 Sol or Claude Fable 5?

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

Can I use both GPT-5.6 Sol and Claude Fable 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 Fable 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 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.
• Claude Sonnet 5 vs Claude Fable 5Anthropic's two current-generation flagships, balanced Sonnet against literary Fable.
• 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.
• Claude Opus 5 vs Claude Fable 5Anthropic's deepest new model against its writing specialist: raw capability versus a tuned literary voice.
• 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.
• GPT-5.6 Sol vs Claude Opus 4.8The head-to-head at the very top: each lab's premium tier on the hardest work.