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OpenAI

GPT-5.6 Sol: Online Chat & API

gpt-5.6-sol

The flagship tier of OpenAI's GPT-5.6 family — maximum reasoning power for the hardest coding, analysis and agent tasks, with 1M context.

Input 637,5 ₽ · Output 3 825 ₽ /1M tokens1.05M context Thinking Prompt caching
API key
gpt-5.6-sol
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Try it right here

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

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About GPT-5.6 Sol

GPT-5.6 Sol is the top of the GPT-5.6 family: the tier to use when the problem genuinely demands maximum reasoning — complex system design, hard mathematics, high-stakes analysis and demanding agent runs.

It shares the family's 1M-token context window, and prompt caching keeps long agent sessions economical.

On Sozdai you can use GPT-5.6 Sol 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 GPT-5.6 Sol

Maximum reasoning power

OpenAI's strongest tier for genuinely hard problems where output quality dominates cost.

Built for demanding agents

Sustains quality across long multi-step runs with tools and large context.

OpenAI-compatible API

Point your existing OpenAI SDK at our base URL and it just works — streaming, tool calling, usage accounting included.

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 IDgpt-5.6-sol
FamilyOpenAI
TypeLLM
Context window1.05M tokens
Input price637,5 ₽ / 1M tokens
Output price3 825 ₽ / 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 \"gpt-5.6-sol\". 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 GPT-5.6 Sol 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 — streaming and tool calling included.

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 — reasoning can be enabled per request, with the depth the flagship tier is built for.

What is the context window?+

1M tokens — hold entire systems and long agent runs in view.