OpenAI: GPT-5.5 Pro
gpt-5.5-pro- Input / Output
- $30.00 / $180.00
- Context
- 1.05M
- Max output
- 128K
- Modalities
- VisionChat
- Capabilities
- Tool useReasoning
About GPT-5.5 Pro
GPT-5.5 Pro is the high-compute version of GPT-5.5, which OpenAI says thinks harder to give consistently better answers to demanding problems. It supports medium, high (default), and xhigh effort, takes text and images, and returns text. It does not offer prompt caching, and long requests can take minutes.
Where it works well
- High is the default effort, with xhigh available.
- Most recent knowledge cutoff of the Pro tiers, December 2025.
- Supports code interpreter, hosted shell, MCP, and web search.
- Large context window shared with GPT-5.5.
When to choose another model
- Responses are slow, so interactive chat belongs on standard GPT-5.5.
- No prompt caching discount, which matters for repeated prefixes.
- Medium is the lowest effort, so there is no fast path for trivial calls.
Getting started
Create API key
Create a key in Console, then use it with every model on the platform.
Send your first request
Copy the example for your language and run it against the endpoint.
Text to textResponses APIPOST/v1/responsesAPI format:curl https://api.tokenlab.sh/v1/responses \ -H "Content-Type: application/json" \ -H "Authorization: Bearer sk-xxx" \ -d '{ "model": "gpt-5.5-pro", "input": "Hello!" }'
Pricing
The Verified price applies to Verified, which costs less on most models. The Official price is the model maker's published price and applies to the more reliable Official route. Auto bills the route that completes the request.
Input tokens <= 272K · Text to text
per 1M tokens- Official price
- Input $30.00 / Output $180.00
- Verified price
- —
- Discount
- —
Input tokens 272K-1.05M · Text to text
per 1M tokens- Official price
- Input $60.00 / Output $270.00
- Verified price
- —
- Discount
- —
Charged per call, only when the model uses the tool.
Web search
- Official price
- $0.01/search
- Verified price
- —
- Discount
- —
| Official priceper 1M tokens | Verified priceper 1M tokens | Discount | |
|---|---|---|---|
| Input tokens <= 272K · Text to text | Input $30.00 / Output $180.00 | — | — |
| Input tokens 272K-1.05M · Text to text | Input $60.00 / Output $270.00 | — | — |
| Tool feesCharged per call, only when the model uses the tool. | |||
| Web search | $0.01/search | — | — |
Usage & activity
Success rate is the share of requests that completed. Latency is how long a full response takes; P95 means 95% of requests finished within that time.
Usage & availability
Last 24 hours- Requests
- Success rate
- P95 latency
- Total tokens
Data is based on aggregate user requests, excluding status checks.
Open in Console
Open GPT-5.5 Pro in Console with a prompt ready to edit or send.
Help me try gpt-5.5-pro with a short message at /v1/responses. Show the reply, latency, and cost.
Use cases
Best for- Code
- Reasoning
- Vision
Hardest problems
Tackle questions where standard GPT-5.5 gets stuck or gives answers that disagree between runs.
Final-pass audits
Review work produced by faster models as a final pass before it ships or is sent to a client.
Scientific and quantitative work
Derive and check multi-step quantitative results, with every intermediate step shown for review.
Complex coding
Plan large refactors that need careful ordering and cross-file reasoning before any code is changed.
Prompt examples
Check this derivation line by line and point out the first incorrect step.
Review the full diff and list anything that breaks backward compatibility.
Design a rollout plan for these three dependent changes and justify the order.
This model has conditional pricing. Monthly token totals alone cannot produce a reliable estimate; use the detailed pricing for the request specification, cache, and applicable time window.
FAQ
What is GPT-5.5 Pro?
GPT-5.5 Pro is the highest-accuracy GPT-5.5 tier. It uses more compute per answer and is aimed at slower, precision-heavy reasoning and coding. It is slower than standard GPT-5.5 by design.
Which effort levels does GPT-5.5 Pro have?
Medium, high, and xhigh. High is the default, so every request already receives deep reasoning without extra configuration. Higher effort means longer waits, so reserve xhigh for the hardest cases.
Does GPT-5.5 Pro support caching?
No. Prompt caching is not available on this tier, so repeated long prefixes are processed in full each time. Keep prompts compact and avoid resending large shared context.
How do I call GPT-5.5 Pro?
It is called like any other chat model on this service, with the usual message, tool and image fields. Set generous client timeouts, because high-effort requests can run for minutes.
Should I use GPT-5.5 Pro for chat?
Not usually. Response times can reach minutes, which is too slow for interactive chat. Use GPT-5.5 for conversations and keep Pro for offline, high-stakes jobs.
How much does GPT-5.5 Pro cost?
On TokenLab, GPT-5.5 Pro costs Input $30.00 / Output $180.00 per 1M tokens. The pricing table above shows the full breakdown. Rates depend on the billing unit, specification, and usage. Compare matching conditions in the model's detailed pricing; a single rate does not determine the total cost.
What are the context window and output limit of GPT-5.5 Pro?
GPT-5.5 Pro accepts up to 1,050,000 tokens of context and returns up to 128,000 tokens in one response.
Which endpoint should GPT-5.5 Pro use?
Use https://api.tokenlab.sh/v1/responses for GPT-5.5 Pro. The request example below shows the matching code shape.
Which operations does GPT-5.5 Pro support?
GPT-5.5 Pro supports Text to text. Select an operation above to see its endpoint and request example.
Compare GPT-5.5 Pro
Sources
Reviewed Oct 2, 2026
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