GPT-5.6 Sol Pro

Name: OpenAI GPT-5.6 Sol Pro
Price: 4 USD
Availability: InStock
Author: OpenAI

openai/gpt-5.6-sol-pro

GPT-5.6 Sol Pro is the same GPT-5.6 Sol model, the flagship of OpenAI's GPT-5.6 family, served in OpenAI's pro reasoning mode rather than as a separate model. Pro mode spends more model work on each request before returning one final answer, which OpenAI recommends for complex optimization, high-value coding or review, and deep analysis. It brings higher latency and token usage, so standard Sol remains the better choice for routine or latency-sensitive work.

Use in agent Get API key

Input price: $4.00USD / 1M tokens
Output price: $20.00USD / 1M tokens
Context window: 1.1M
Max output: 128K

Production route

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Prompt

Image URL or upload

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1.1M context128K max outputVision

Input$4.00/MOutput$20.00/MCache read$0.40/MCache write$5.00/M

OutputReady

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Model card

Specifications

Pricing

Input: $4 / 1M tokens
Output: $20 / 1M tokens
Cache read: $0.40 / 1M tokens
Cache write: $5 / 1M tokens

Context & modalities

Context window: 1,050,000 tokens
Max output: 128,000 tokens
Input: Text, image
Output: Text

Capabilities

Chat: Supported
Vision: Supported
Reasoning: Supported
Structured output: Supported
Function calling: Supported
Audio input: Not supported

Access

Provider: OpenAI
Model ID: openai/gpt-5.6-sol-pro
Execution: sync
Base URL: https://api.sandbase.ai
API: Responses API
Endpoint: /v1/responses
API: Chat Completions API
Endpoint: /v1/chat/completions

Start building

Send your first request

Choose either supported API with unified authentication and usage tracking.

Production API

Responses API endpoint

https://api.sandbase.ai/v1/responses

Model ID

openai/gpt-5.6-sol-pro

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/responses" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "openai/gpt-5.6-sol-pro",
  "input": "Hello",
  "max_output_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"

Choose your model

Compare models

All language models

Model	Context	Input / 1M	Output / 1M	Released
GPT-5.6 Sol ProThis model `OpenAI`	1.1M	$4.00	$20.00	Jul 9, 2026
GPT-6.1 Sol Pro `OpenAI`	1.1M	$2.00	$10.00	Sep 29, 2026
GPT-6.1 Sol `OpenAI`	1.1M	$2.00	$10.00	Sep 29, 2026
GPT-6 Luna Pro `OpenAI`	1.1M	$0.10	$0.50	Sep 22, 2026
GPT-6 Luna `OpenAI`	1.1M	$0.10	$0.50	Sep 22, 2026
GPT-6 Sol Pro `OpenAI`	1.1M	$2.00	$10.00	Sep 22, 2026

Questions

FAQ

How do I call OpenAI GPT-5.6 Sol Pro through SandBase?

Create a SandBase API key, then send requests with the model ID "openai/gpt-5.6-sol-pro" to Responses API (/v1/responses) or Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

How much does OpenAI GPT-5.6 Sol Pro cost?

$4 per 1M input tokens and $20 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

What is the context window of OpenAI GPT-5.6 Sol Pro?

1.1M tokens of context, with up to 128K output tokens per response.

Which features does OpenAI GPT-5.6 Sol Pro support?

OpenAI GPT-5.6 Sol Pro supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

Do I need a separate OpenAI account?

No. One SandBase API key and balance gives you access to OpenAI GPT-5.6 Sol Pro and the other models in the catalog; you do not need to sign up with OpenAI separately.