Question 1

What is Claude Sonnet 5.5?

Accepted Answer

Claude Sonnet 5.5 is the mid-tier model in Anthropic’s Claude 5.5 family, released on September 28, 2026. Anthropic describes it as the best combination of speed and intelligence. It has a 1M-token context window and up to 128K output tokens.

Question 2

How do I use Sonnet 5.5 on Runable?

Accepted Answer

Sign in to Runable, start a new task and pick Sonnet 5.5 in the model menu next to the prompt box. Describe what you need and Runable runs the job on Sonnet 5.5.

Question 3

Sonnet 5.5 vs Opus 5.5: which should I use?

Accepted Answer

Use Sonnet 5.5 for well-scoped work such as docs, slides, spreadsheets and quick fixes. It is faster and half the API price, and nearly matches Opus 5.5 on GDPval-AA. Use Opus 5.5 for complex, open-ended projects, where Anthropic says it is clearly stronger.

Question 4

Sonnet 5.5 vs GPT-6.1 Sol: which is better?

Accepted Answer

They have the same API list price, $2 input and $10 output per million tokens. In October 2026 Artificial Analysis scored Sonnet 5.5 at 56 and GPT-6.1 Sol at 52 on its Intelligence Index, and measured Sonnet 5.5 as more than twice as fast. GPT-6.1 Sol cost far less per task in their runs, at about $0.72 against $5.46. Try both on your own task on Runable.

Question 5

Do I need a Claude subscription or API key?

Accepted Answer

No. Sonnet 5.5 runs on your Runable plan and credits, so you do not need an Anthropic account or API key.

Question 6

Can I turn off thinking on Sonnet 5.5?

Accepted Answer

Partly. Sonnet 5.5 can skip up-front thinking and only think between tool calls, which keeps simple replies quick. Thinking cannot be fully disabled.

Question 7

What is the context window of Sonnet 5.5?

Accepted Answer

1 million tokens, with up to 128K output tokens per response. That fits long documents, big spreadsheets and full project histories.

Question 8

What can I make with Sonnet 5.5 on Runable?

Accepted Answer

Slide decks, documents, spreadsheets, websites, social carousels, emails and research summaries. Runable gives the model the tools to produce real files and publish pages.

Model	Best for	Speed	API price in / out
Opus 5.5	Long, complex agent work	96 tokens/s	$4 / $20
Sonnet 5.5	Everyday tasks, best speed for the smarts	134 tokens/s	$2 / $10
Haiku 5.5	High-volume, quick tasks	235 tokens/s	$0.10 / $0.50 *

Claude Sonnet 5.5

Build with Sonnet 5.5

Sonnet 5.5 on Runable

Polished, fast

Snappy edits

Step up anytime

How to use Sonnet 5.5 on Runable

Select Sonnet 5.5

Describe the job

Edit and ship

One prompt, finished work

Why choose Sonnet 5.5

Almost Opus

Number two overall

Faster than Sonnet 5

Fixes things

Uses a computer

Room for big files

Sonnet 5.5 specs

Opus vs Sonnet vs Haiku 5.5

The only AI agent you need

Sonnet 5.5 FAQs

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