Claude Opus 5 in NeuralSpace: older model Anthropic in chat, code and API

Briefly about the main thing (BLUF)

Claude Opus 5 - older model Anthropic - already works in NeuralSpace: in chat, in the “Code” section and through public API. We show where Opus is strongest, how to choose it, how much it costs and when it makes more sense to take a simpler model instead.

Appeared in NeuralSpace Claude Opus 5 — the new senior model of the line Opus from Anthropic. It is already available wherever we have neural networks for text: in chat, in section "Code" (vibecoding), in public API and through the MCP server for external AI agents. No separate subscription required - pay as you go.

What is Opus and why do you need it

Claude has three "weight categories". Haiku is fast and cheap for simple questions. Sonnet is an everyday workhorse. Opus - senior line: it is taken when the task is complex and the cost of error is high. Opus 5 is the latest model in this line, next after Opus 4.8.

A simple rule: if the problem is solved in two sentences - Opus is not needed, overpay. If the task falls apart for other models in the middle, this is where Opus pays off.

Where Opus5 is strongest

Code and long technical problems

This is the main scenario of the Opus line. The model doesn’t just write a function based on its description, but keeps in mind the structure of the project: where everything is, what depends on what, what will break if you change this line. In a long chain of edits, she is less likely to “forget” what was discussed twenty messages ago.

In the “Code” section you can see this right away: you describe the project in words, and the model assembles a site, application or bot and edits it according to your cues. Opus 5 is selected in the list of models under the input field - in the same place as Sonnet, GPT-5.6, Grok and the rest.

Long context without losing thread

The model works with very large volumes of text at a time - you can load a long document, correspondence, technical specifications entirely and parse them without cutting them into pieces. This is the case when “it ate the whole context and began to get confused” ceases to be a problem.

Analysis of images and documents

Opus 5 understands pictures: diagram, screenshot, photo of a table, design layout. You can attach an image directly in the chat and ask to explain what is on it, find an error in the diagram, or turn the sketch into a description for the layout designer. Documents (PDF, Word, txt) are attached there.

How to choose Opus 5

In the chat, the model is selected in the list on the left, above the input field:

In the “Code” section - in the list under the request field, next to the submit button. In API the model is called BLK0 and works at the same address and in the same format as the other Claude models - there is no need to change the integration code, just enter the new model name.

How much does it cost

We do not sell a subscription: you pay for actual use of tokens from your balance - prices are recalculated at the live dollar rate. The price of the model is recalculated automatically according to the current exchange rate, so always look at the table on the page for exact numbers "API" — for each model it is indicated how much a million input and a million output tokens cost.

Common sense guideline: Opus more expensive than Sonnet and noticeably more expensive than Haiku. Therefore, a reasonable strategy is to keep the complex ones at Opus 5, and run the routine on a simpler model. Switching takes one second and is done in the same list.

When to take Opus 5 and when not to

• Take it, if you write or analyze code, manage a long project in vibecoding, analyze a large document, prepare complex text where precision of wording is important.
• Don't take it for short questions, drafts and chatter - Haiku or Sonnet can handle this, and it will cost much less.

How to try

1. Register for NeuralSpace — new users are awarded tokens for testing.
2. Open chat and select Claude Opus 5 from the list of models.
3. For the code - go to the section "Code", create a project and select the same model under the input field.

All models live on the same balance and on the same website: no need to create separate accounts, subscriptions and foreign cards - you can try Opus 5 right now.

Frequently asked questions (FAQ)

Question: How to get the best result from a neural network?
Answer: Use detailed prompts (descriptions) in English, set the style and details of the scene.

Question: Can these materials be used for commercial purposes?
Answer: Yes, the generated content is entirely yours.