GPT-5.5 Pro
OpenAI · released Apr 24, 2026
- Type
- Proprietary
- Input
- $30.00
- Output
- $180.00
- Cached
- Not published
List price · per 1M tokens · OpenAI at 1.1M context · source ↗
Our take
Written Aug 3, 2026GPT-5.5 Pro is OpenAI's flagship hosted-only model built for enormous single requests — it can take in over one million tokens at once, including text, images and files. It is positioned for long-document and extended-session workloads where premium pricing is acceptable, though no independent quality scores are available yet.
Choose this when you need to feed an entire codebase, book-length document or extended conversation history into a single request, or when your workflow mixes text with images and file attachments. Pick it if OpenAI's extended tier at 13 tokens per second suits your pace. Skip it if cost-sensitive output volume matters, if you need measured quality benchmarks to justify the spend, or if faster throughput is essential.
The case for it
- Exceptionally large request limit at 1,050,000 tokens — among the largest disclosed in our catalogue.
- Accepts text, images and files together in one prompt.
The case against it
- Very high output pricing on both tiers, with the extended tier doubling the standard rate.
- No benchmark scores recorded, so there is no measured quality data.
- Only 13 tokens per second on the extended tier — the only throughput figure we hold.
How good is it?
We hold no score for this model.
We look for every model we track on every board we watch, and none of them has turned up GPT-5.5 Pro — so there is no intelligence, coding, agentic or writing score to show you, not a low one, none.
Or rent it from someone else
Why this differs from the header. The strip above quotes OpenAI's own list price. This is the cheapest live offer at the widest standard context we hold, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.
- per 1M tokens
- $30.00 in / $180.00 out
- Context served
- 1.1M
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenAIflex tier | $15.00 / $90.00 | 1.1M | not measured | No | Yesunknown period | Unknown |
| OpenRouter | $30.00 / $180.00 | 1.1M | not measured | Unknown | Unknown | Unknown |
| OpenAI | $30.00 / $180.00 | 1.1M | 4 tok/s | No | Yesunknown period | Unknown |
Across the 3 listings we hold: 2 say they do not train on prompts, 0 say they do and 1 do not say. 0 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
- ✓
- Supported
- ✗
- Not supported
- Not published
- host gave no parameter list
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenAIflex | ✓ | ✓ | ✓ |
| OpenRouter | ✓ | ✓ | ✓ |
| OpenAI | ✓ | ✓ | ✓ |
Tool calling: 3 of 3 listings say yes. JSON output: 3 of 3 listings say yes. Strict schema: 3 of 3 listings say yes.
Models people weigh against GPT-5.5 Pro
When we formed this view
Dates behind this page
Prices last checked 9d ago
What we do not know about this model yet
- No board we watch has turned up a score, so we hold no quality figures at all.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 3 listings do not say whether they train on prompts.
- We hold no cached-input rate for any of its listings.
Licence and identifiers
What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.
Licence
Commercial API terms. We hold no licence record for this model, so there is nothing to summarise here.
Identifiers
- Modality record
- text+image+file->text
- Catalogue slug
- openai-gpt-5-5-pro