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gpt-5.5-pro API pricing & access
gpt-5.5-pro API pricing: $30 per 1M tokens. gpt-5.5-pro. Supports text, image input and text output. Listed specifications follow publ…
gpt-5.5-pro API access
gpt-5.5-pro. Supports text, image input and text output. Listed specifications follow public vendor documentation. Available features and limits depend on the selected serving channel.
Compare supported API endpoints and capabilities, then access gpt-5.5-pro through the unified API gateway.
- Category
- text
- Context length
- 1050000 tokens
- Maximum output
- 128000 tokens
- Supported APIs
- OpenAI Chat Completions API, Anthropic Messages API
- API endpoints
- POST /v1/chat/completions, POST /v1/messages
- Input modalities
- text, image
- Output modalities
- text
- Capabilities
- structured output, function calling, vision, reasoning
gpt-5.5-pro API pricing
- Base input price
- $30 per 1M tokens
- Base output price
- $180 per 1M tokens
Base prices are shown in USD before group-specific adjustments. Open the live pricing page for current access-group prices.
About gpt-5.5-pro
gpt-5.5-pro is the Pro reasoning version of GPT-5.5, using text and image input and text output. It is served through Responses; difficult requests can take several minutes, so assess it by verified outcomes.
The documented reasoning levels are medium, high and xhigh, with high as the default. Check Responses and background execution support on the route, set suitable timeouts and track the final result.
Official reference, checked 2026-10-14.
Use cases and prompting
- State known conditions, the conclusion to establish and how to verify it.
- Check background execution support, retain request identifiers and wait for a completed or failed result.
- Compare correctness and elapsed time at medium and high before increasing effort.
- Compare the same test cases with gpt-5.5; check request and response formats in the API documentation.
How to call gpt-5.5-pro
gpt-5.5-pro is served through tbuy's unified gateway. Existing OpenAI or Anthropic SDK code keeps working: point base_url at https://modelsok.com and use your tbuy API key.
curl (OpenAI-compatible)
curl https://modelsok.com/v1/chat/completions \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "gpt-5.5-pro", "messages": [{"role": "user", "content": "Hello"}]}'Python (openai SDK)
from openai import OpenAI
client = OpenAI(base_url="https://modelsok.com/v1", api_key="YOUR_API_KEY")
response = client.chat.completions.create(
model="gpt-5.5-pro",
messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)Python (anthropic SDK)
from anthropic import Anthropic
client = Anthropic(base_url="https://modelsok.com", api_key="YOUR_API_KEY")
message = client.messages.create(
model="gpt-5.5-pro",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello"}],
)
print(message.content[0].text)Related pages
Frequently asked questions about gpt-5.5-pro
What is gpt-5.5-pro?
gpt-5.5-pro. Supports text, image input and text output. Listed specifications follow public vendor documentation. Available features and limits depend on the selected serving channel.
How do I call gpt-5.5-pro?
Create an API key with access to gpt-5.5-pro, then use the exact model ID and a supported endpoint from the API access section. Request fields depend on the selected endpoint.
How is gpt-5.5-pro priced?
Pricing depends on the selected provider group and the model billing unit. Refer to the current input, output, request, or media prices in the pricing section.
What is the context window of gpt-5.5-pro?
The model catalog lists a context window of 1050000 tokens. Check the selected endpoint for request limits.
What is the maximum output of gpt-5.5-pro?
The model catalog lists a maximum output of 128000 tokens. Your request settings may set a lower limit.
How should I evaluate gpt-5.5-pro for my project?
Start with the use cases and prompting guidance on this page, then evaluate the model with representative inputs from your project.