OpenAI · Model
GPT-5.5 Pro pricing, context window and specs
GPT-5.5 Pro costs $30 per million input tokens and $180 per million output tokens, and reads up to 1,050,000 tokens per request. By blended price it is the most expensive of OpenAI’s 10 current models here.
- Input / 1M
- $30
- Output / 1M
- $180
- Cached / 1M
- –
- Context
- 1,050,000
- Max output
- 128,000
- Released
- 2026-04-24
Estimate your cost with GPT-5.5 ProCompare all OpenAI modelsCount tokens for GPT-5.5 Pro
Pricing
GPT-5.5 Pro API pricing
| Price per 1M tokens | Input | Output |
|---|---|---|
| Standard | $30 | $180 |
| Batch API | $15 | $90 |
| Prompts of 272,000+ tokens | $60 | $270 |
Output costs 6.0× the input price, so long replies drive the bill more than long prompts. No cached-input price is published, so repeated prompt prefixes are billed at the full input price. Once a single prompt reaches 272,000 tokens, the whole request is billed at the higher long-context rate shown above.
Examples
What GPT-5.5 Pro costs in practice
| Workload | Tokens in / out | Requests/day | Per request | Per month |
|---|---|---|---|---|
| Support chatbot | 1,500 / 400 | 1,000 | $0.12 | $3,559 |
| RAG app | 6,000 / 500 | 500 | $0.27 | $4,106 |
| Coding agent | 40,000 / 2,000 | 200 | $1.56 | $9,490 |
| Document summariserbatch | 8,000 / 600 | 300 | $0.17 | $1,588 |
Change any number in the cost calculator.
Context
Context window
GPT-5.5 Pro accepts up to 1,050,000 tokens per request, roughly 787,500 English words or 1,575 pages. That budget is shared between your prompt and the reply, and a single reply is capped at 128,000 tokens.
Filling the whole window with one prompt costs about $63.00 at list price, so for repeated long-document work, retrieval (sending only the relevant parts) or prompt caching is usually much cheaper.
Features
Capabilities
- Image input
- Yes
- Tool / function calling
- Yes
- Reasoning mode
- Yes
- Prompt caching
- No
- Structured output
- Yes
- Open weights
- No
- Accepts
- file, image, text
- Knowledge cutoff
- 2025-12-01
As declared by the provider’s API. It shows a feature exists, not how well it works.
API
GPT-5.5 Pro model ID
- OpenRouter
openai/gpt-5.5-pro- OpenAI API
gpt-5.5-pro(alias)gpt-5.5-pro-2026-04-23(pinned)
OpenAI lists GPT-5.5 Pro as current. Every GPT model ID, with aliases and snapshots.
OpenAI
Where GPT-5.5 Pro sits in OpenAI’s line-up
Ranked by blended price (three parts input to one part output, $67.50 per 1M for GPT-5.5 Pro), it is the most expensive of OpenAI’s 10 current models here. One step down, GPT-6 Astra costs $20 blended (70% less). It has the same published limits and features as GPT-5.5 Pro. See every OpenAI model and price
| Model | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|
| gpt-oss-120b | $0.037 | $0.17 | 131,072 | 2025-08-05 |
| GPT-6 Luna | $0.10 | $0.50 | 1,050,000 | 2026-09-22 |
| GPT-4o-mini | $0.15 | $0.60 | 128,000 | 2024-07-18 |
| GPT-5.4 Mini | $0.75 | $4.50 | 400,000 | 2026-03-17 |
| GPT-6.1 Sol | $2 | $10 | 1,050,000 | 2026-09-29 |
| GPT-4o | $2.50 | $10 | 128,000 | 2024-05-13 |
| GPT-5.6 Terra | $2 | $12 | 1,050,000 | 2026-07-09 |
| GPT-5.5 | $5 | $30 | 1,050,000 | 2026-04-24 |
| GPT-6 Astra | $10 | $50 | 1,050,000 | 2026-09-04 |
| GPT-5.5 Pro (this page) | $30 | $180 | 1,050,000 | 2026-04-24 |
OpenAI’s current models with a page here, cheapest first. Older and superseded models are listed on the provider page and in the comparison table.
History
Earlier versions of GPT-5.5 Pro
The previous model in this line is GPT-5.4 Pro, first listed on 2026-03-05. Compared with it, GPT-5.5 Pro’s input price is unchanged and its output price is unchanged.
| Model | Input / 1M | Output / 1M | Context | Released |
|---|---|---|---|---|
| GPT-5.4 Pro | $30 | $180 | 1,050,000 | 2026-03-05 |
| GPT-5.2 Pro | $21 | $168 | 400,000 | 2025-12-10 |
| GPT-5 Pro | $15 | $120 | 400,000 | 2025-10-06 |
Earlier releases with the same name and size in our data, newest first. Dates are when our source first listed each model.
Save
Cheaper alternatives
- Claude Opus 5.5Anthropic88% cheaper
- GPT-5.5OpenAI83% cheaper
Current models from major providers, one per provider, that keep image input, tool calling, a reasoning mode, a usable context window and output limit. Compared by blended price.
Compare
Similarly priced models
- Claude Fable 5.1Anthropic$10 / $50
- Qwen3.8 Max PrimeQwen$4 / $12
- Nova Premier 1.0Amazon$2.50 / $12.50
- Gemini 3.1 Pro PreviewGoogle$2 / $12
- GLM 5.3 PrimeZ.ai$2.80 / $8.80
Current models from other major providers, closest blended price.
FAQ
GPT-5.5 Pro questions
How much does GPT-5.5 Pro cost?
GPT-5.5 Pro costs $30 per million input tokens and $180 per million output tokens. A typical chatbot reply (1,500 tokens in, 400 out) costs about $0.12. Use the LLM cost calculator for your own workload.
What is GPT-5.5 Pro’s context window?
1,050,000 tokens, about 787,500 English words or 1,575 printed pages, shared between your prompt and the reply. A single reply can be up to 128,000 tokens.
Does GPT-5.5 Pro support prompt caching and batch requests?
No cached-input price is published for it. A batch API is available at $15 input and $90 output per million tokens.
What are cheaper alternatives to GPT-5.5 Pro?
With the same essentials (image input and tool calling), the cheapest options are Claude Opus 5.5 (88% cheaper), GPT-5.5 (83% cheaper). Cheaper doesn’t mean equivalent, so test them on your own prompts.
What is the API model ID for GPT-5.5 Pro?
On OpenRouter it is openai/gpt-5.5-pro. In OpenAI’s own API, use gpt-5.5-pro; OpenAI lists the model as current. The GPT model ID list has every alias and snapshot. Pass the ID as the model value in each request.
What did GPT-5.5 Pro replace?
The previous OpenAI model in the same line is GPT-5.4 Pro, first listed on 2026-03-05. Compared with it, GPT-5.5 Pro’s input price is unchanged and its output price is unchanged. Prices are only part of the picture, so test the newer model on your own prompts before switching.
Is GPT-5.5 Pro open source?
No, GPT-5.5 Pro is only available through OpenAI’s API and partners; its weights aren’t published.