gpt-5-6-solGPT-5.6 Sol is the frontier model in the GPT-5.6 family — OpenAI's highest-intelligence tier. The gpt-5.6 alias routes to Sol, and it roughly corresponds to the unsuffixed top model tier of earlier GPT-5 families. It supports reasoning tokens, text + image input and text output, a 1,050,000-token context window, 128,000 max output tokens, and a Feb 16 2026 knowledge cutoff. Live on API Models over both /v1/chat/completions and /v1/responses: $1.103 input / $6.618 output per 1M tokens (cached input $0.110) — about 78% below OpenAI's own $5 / $30 list. One API key for every model, reachable from China with no organization verification, and only successful requests billed.
The highest-intelligence GPT-5.6 model — the gpt-5.6 alias routes here
Seven levels: gpt-5.6-sol plus -low / -medium / -high / -xhigh / -max / -ultra, all one price
Text + image input, text output; 1.05M-token context, 128K max output
OpenAI-compatible /v1/chat/completions and /v1/responses; $1.103 / $6.618 per 1M
View complete API reference with all parameters and examples.
Enable real-time streaming responses with Server-Sent Events.
{
"model": "gpt-5-6-sol",
"stream": true,
"messages": [...]
}Enable the model to use tools and call functions.
{
"model": "gpt-5-6-sol",
"tools": [{
"type": "function",
"function": {
"name": "get_weather",
"description": "Get current weather for a location",
"parameters": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City name"}
},
"required": ["location"]
}
}
}],
"messages": [{"role": "user", "content": "What's the weather in Tokyo?"}]
}Get structured JSON responses from the model.
{
"model": "gpt-5-6-sol",
"response_format": {"type": "json_object"},
"messages": [{"role": "user", "content": "Extract info as JSON: John is 30 years old"}]
}| Parameter | Type | Required | Description |
|---|---|---|---|
| model | string | Yes | Model identifier (e.g., gpt-5-6-sol) |
| messages | array | Yes | Array of message objects with role and content |
| max_tokens | integer | No | Maximum tokens in the response |
| stream | boolean | No | Enable streaming responses (SSE) |
| temperature | number | No | Sampling temperature (0.0 - 2.0) |
| top_p | number | No | Nucleus sampling threshold (0.0 - 1.0) |
| tools | array | No | Function calling tools definition |
| response_format | object | No | Output format (e.g., json_object) |
View complete API reference with streaming, thinking, and more.
Billing: Cost = (input_tokens * input_price + output_tokens * output_price) / 1,000,000
GPT-5.6 Sol is a Large Language Model API provided by OpenAI. GPT-5.6 Sol is the frontier model in the GPT-5.6 family — OpenAI's highest-intelligence tier. The gpt-5.6 alias routes to Sol, and it roughly corresponds to the unsuffixed top model tier of earlier GPT-5 families. It supports reasoning tokens, text + image input and text output, a 1,050,000-token context window, 128,000 max output tokens, and a Feb 16 2026 knowledge cutoff. Live on API Models over both /v1/chat/completions and /v1/responses: $1.103 input / $6.618 output per 1M tokens (cached input $0.110) — about 78% below OpenAI's own $5 / $30 list. One API key for every model, reachable from China with no organization verification, and only successful requests billed. Through API Models platform, you can access this model via a unified API with transparent pay-as-you-go pricing. Current pricing: Input: $1.103, Output: $6.618 per 1M tokens.
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GPT-5.6 Sol is available through API Models at: Input: $1.103, Output: $6.618 per 1M tokens. Billing is pay-as-you-go — you only pay for what you generate.
Sign up at API Models, get your API key, and call our unified API endpoint. We provide detailed API documentation with code examples in cURL, Python, and Node.js.
API Models offers the same GPT-5.6 Sol model through our aggregation platform. We provide a unified API interface so you do not need separate accounts for each provider - one API key to access all models.
GPT-5.6 Sol is the frontier, highest-intelligence model in OpenAI's GPT-5.6 family, roughly the unsuffixed top tier of earlier GPT-5 families; the gpt-5.6 alias routes to Sol. It supports reasoning tokens, text + image input and text output, a 1,050,000-token context window, 128,000 max output tokens, and a Feb 2026 knowledge cutoff.
On apimodels.app, GPT-5.6 Sol is $1.103 per 1M input tokens and $6.618 per 1M output tokens, with cached input billed at $0.110 — roughly a fifth of OpenAI's own $5 / $30 list. Pay-as-you-go, failed requests are never billed, and new accounts get $1 free. Requests whose input exceeds 272,000 tokens are billed end-to-end at $2.206 input / $9.926 output (2× input, 1.5× output), matching the upstream long-context rate step. Reasoning tokens count as output tokens.
Point base_url at https://apimodels.app/api/v1, use your API key, and set model to gpt-5.6-sol (the gpt-5.6 alias also routes to Sol). Both OpenAI-compatible endpoints work — /v1/chat/completions and /v1/responses — so openai-python, openai-node, Cherry Studio, Cursor and friends work as-is. To change reasoning depth, switch the model-name suffix: -low, -medium, -high, -xhigh, -max, -ultra. All six cost the same per token; deeper effort simply emits more reasoning tokens, billed as output.
Upstream injects a ~1,450-token system preamble into every request, so usage.input_tokens never drops below that floor even for a one-line prompt. `parallel_tool_calls: false` is ignored upstream, so the model may still return several tool_calls in one turn. Input above 272,000 tokens rebills the whole request at 2× input / 1.5× output. Text + image input, function calling (tools), streaming and /v1/responses are all verified working.
Sol is the frontier (top intelligence; $1.103 / $6.618 on apimodels.app); Terra balances intelligence and cost (mini tier, official $2.5/$15); Luna targets cost-sensitive, high-volume workloads (nano tier, official $1/$6). All three share one OpenAI-compatible endpoint — switch by changing a single model name. All three are live on API Models today (call Luna as gpt-5.6-luna-max).
On API Models, GPT-5.6 Sol runs alongside 60+ models on one API key and one balance, so choosing is about fit, not lock-in. It supports Frontier / Flagship、Reasoning Tokens、Text + Image In、1.05M Context, and you can weigh it on price and capability against other Large Language Model models, then switch by changing a single model-name string — no new account or integration. Browse every Large Language Model option with live pricing at apimodels.app/models.
GPT-5.6 Sol supports: Frontier / Flagship、Reasoning Tokens、Text + Image In、1.05M Context. See the API Models docs for full parameters and call examples.
Yes. API Models exposes GPT-5.6 Sol through a single unified API and one key — no separate provider accounts, and no need to handle each provider's regional network access yourself.
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