GPT-5.6 Sol vs Claude Sonnet 5

The two defaults most people actually choose between: OpenAI's mainstream flagship against Anthropic's balanced current generation.

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

What the numbers say

• Claude Sonnet 5 is about 2.0x cheaper on output tokens (120 vs 240 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 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-5.6 Sol and Claude Sonnet 5?

Claude Sonnet 5 is about 2.0x cheaper on output tokens (120 vs 240 credits per 1M). GPT-5.6 Sol is the newer release (July 2026 vs June 2026).

Is GPT-5.6 Sol or Claude Sonnet 5 cheaper?

Claude Sonnet 5 is cheaper: 120 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 Claude Sonnet 5?

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

Can I use both GPT-5.6 Sol 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-5.6 Sol 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

• 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 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 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.
• 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-5.6 Sol vs Claude Fable 5OpenAI's flagship against Anthropic's writing-and-reasoning specialist from the same release wave.
• 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.