GPT-5.5 Pro
openai/gpt-5.5-proGPT-5.5 Pro is a separate OpenAI model in the GPT-5.5 family that uses more compute to think harder and give consistently better answers, according to OpenAI. It is intended for tough, high-stakes problems where answer quality matters more than speed, and some requests can take several minutes to finish. Choose it over standard GPT-5.5 when reliability on difficult reasoning, coding or analysis justifies the extra latency; OpenAI serves it for multi-turn and batch API requests.
- Input price
- $30.00USD / 1M tokens
- Output price
- $180.00USD / 1M tokens
- Context window
- 1.1M
- Max output
- 128K
Specifications
- Input
- Text, image
- Output
- Text
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Choose either supported API with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/responses" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "openai/gpt-5.5-pro",
"input": "Hello",
"max_output_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call OpenAI GPT-5.5 Pro through SandBase?
Create a SandBase API key, then send requests with the model ID "openai/gpt-5.5-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-5.5 Pro cost?
$30 per 1M input tokens and $180 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-5.5 Pro?
1.1M tokens of context, with up to 128K output tokens per response.
Which features does OpenAI GPT-5.5 Pro support?
OpenAI GPT-5.5 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-5.5 Pro and the other models in the catalog; you do not need to sign up with OpenAI separately.