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Claude

Claude Opus 5: Online Chat & API

claude-opus-5

Anthropic's newest frontier flagship — the strongest Claude ever shipped, for the problems nothing else can solve. 1M-token context.

Input 637,5 ₽ · Output 3 187,5 ₽ /1M tokens1M context Thinking Prompt caching
API key
claude-opus-5
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Try it right here

Real model, streaming live — free trial credits on sign-up

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About Claude Opus 5

Claude Opus 5 is the new top of the Claude line: Anthropic's most capable model to date, pushing the frontier on coding, research-grade reasoning and long-horizon agentic work.

It carries a 1M-token context window and adaptive thinking — the model gauges each request and reasons as deeply as the task demands. Prompt caching keeps sustained agent workloads economical despite flagship positioning.

On Sozdai you can use Claude Opus 5 two ways with one account and one credit balance: chat in the browser playground on this page, or call it programmatically through an OpenAI-compatible endpoint. Pricing is pure pay-as-you-go per token with no subscription.

Why Claude Opus 5

The strongest Claude

Anthropic's newest frontier model — measurable gains over Opus 4.8 on the hardest coding and reasoning benchmarks.

Adaptive thinking

Reasoning depth scales automatically with difficulty, identical to the official API.

OpenAI-compatible API

Point your existing OpenAI SDK at our base URL and it just works — streaming, tool calling, usage accounting included. Anthropic-native /v1/messages is supported too.

Prompt caching, up to 90% off

Mark stable context (system prompts, tools, documents) with cache_control and repeated tokens are billed at a fraction of the input price.

One balance for everything

Web chat and API share the same credit balance and transparent per-token pricing. No subscription, no minimums.

Specifications

Model IDclaude-opus-5
FamilyClaude
TypeLLM
Context window1M tokens
Input price637,5 ₽ / 1M tokens
Output price3 187,5 ₽ / 1M tokens
Cache read price63,75 ₽ / 1M tokens
Thinking / reasoningYes
Prompt cachingYes
API compatibilityOpenAI SDK + Anthropic /v1/messages
StreamingYes

Integrate in three steps

1

Create an API key

Sign up, open the console and issue a key — free trial credits are included, no card required.

2

Point your SDK at Sozdai

Set the base URL to our endpoint and pass model \"claude-opus-5\". Existing OpenAI SDK code needs no other changes.

3

Ship and monitor

Stream responses in production and track every request's tokens and cost in the usage logs.

Frequently asked questions

Can I try Claude Opus 5 without writing code?+

Yes — the playground on this page is the real model. Sign up, get trial credits and chat instantly; the same account later works for the API.

Is the API compatible with the OpenAI SDK?+

Yes. Use any OpenAI SDK (Python, Node, etc.) with our base URL, or call the Anthropic-native /v1/messages endpoint — both are supported with streaming.

How does pricing work?+

Pure pay-as-you-go per token, shown on this page and billed from your credit balance (1 credit = $0.01). Cache hits are billed at a heavily discounted rate. No subscription.

Does it support thinking / reasoning?+

Yes — adaptive thinking. Opus 5 decides how deeply to reason for each request, exactly like the official API.

What is the context window?+

1M tokens — entire codebases, research corpora and very long agent sessions.