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Claude Sonnet 5.5: the newest model is live on NeuralSpace

Light airy 3D scene by a big window: an open laptop on a white desk, a glowing neural network symbol floating above, bright speed lines nearby, plenty of light

A new model has arrived on NeuralSpace — Claude Sonnet 5.5. It is already available in the chat, the Code section and the public API: the newest Sonnet with the best blend of speed and intelligence and a 1M token context. It answers fast while still holding demanding tasks.

NeuralSpace chat interface: the model selector with Claude Sonnet 5.5 chosen, a working dialog with a long model answer and the token balance

What Claude Sonnet 5.5 can do

  • The best blend of speed and intelligence. The newest generation of the Sonnet line: fast answers without losing quality on hard questions — an everyday working model.
  • 1M token context. Attach a large document or keep a very long conversation going — the model keeps track of it.
  • Coding. It reads existing code, plans changes and applies them step by step, explaining the result.
  • Professional work. Document analysis, technical questions, structured writing and text preparation.

How to try it

  1. Open the chat and pick Claude Sonnet 5.5 from the model list — the model page is also available at /chat/claude-sonnet-5-5.
  2. Ask as usual: the model streams its answer and supports images, documents and web search.
  3. For bigger projects open the Code section, where the model works as an agent: it creates a project, writes and edits files and runs long iterations.

Pricing is based on the tokens actually used and is charged after the answer — the minimum balance threshold is shown before you send, just like for the other models in the section.

When to choose Sonnet 5.5

For light everyday questions, fast models such as DeepSeek, GLM or GPT-6 Luna are enough. Pick Sonnet 5.5 where you need the balance: demanding but non-flagship tasks, long texts and documents, day-to-day coding. When a task calls for maximum depth, the senior models such as Claude Opus 5.5 are there for that.

Frequently asked questions

How is Sonnet 5.5 different from Sonnet 5? It is the newest generation of the line: the best blend of speed and intelligence and a 1M token context.

Where is it available? In the chat, the Code section, and through the public API with a key — see the model list and prices on the API page.

Does it have web search? Yes, like the neighbouring chat models: you can ask it to look up current information.

Does it understand images and documents? Yes, the model accepts images and documents in the chat.