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GPT-5.5 Pro
openai·openai/gpt-5.5-pro·GA·Closed·gpt-pro series
Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
At a glance
Official price$30.00 / $180 per 1M
Cache read — · OpenAI
Lowest paid$27.00 / $162
Requesty Gateway · 1.4× spread
Context1,050,000
⚠ Providers report 400,000–1,050,000; the table below is authoritative
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
Modalities
TextImagePDF
Knowledge cutoff2025-12-01
Released / updated2026-04-23 / 2026-04-23
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 18 providers18 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Requesty | Gateway | $27.00 | $162 | — | — | 1,050,000 | 128,000 | |
| Poe | Gateway | $27.27 | $164 | — | — | 400,000 ⚠ | 128,000 | |
| OrcaRouter | Gateway | $30.00 tiered >272K: $60.00 | $180 | — | — | 1,050,000 | 128,000 | |
| Impossibl | Gateway | $30.00 tiered >272K: $60.00 | $180 | $3.00 | — | 1,050,000 | 128,000 | |
| OpenRouter | Gateway | $30.00 tiered >272K: $60.00 | $180 | — | — | 1,050,000 | 128,000 | |
| CrossModel | Gateway | $30.00 tiered >272K: $60.00 | $180 | — | — | 1,050,000 | 128,000 | |
| OpenAIOfficial | First-party | $30.00 tiered >272K: $60.00 | $180 | — | — | 1,050,000 | 128,000 | |
| Cloudflare AI Gateway | Cloud | $30.00 tiered >272K: $60.00 | $180 | — | — | 1,050,000 | 128,000 | |
| FastRouter | Gateway | $30.00 | $180 | — | — | 1,050,000 | 128,000 | |
| ZenMux | Gateway | $30.00 tiered >272K: $60.00 | $180 | — | — | 1,050,000 | 128,000 | |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1Impossibl$11,760.00
2Eden AI$11,760.00
3Eden AI$11,760.00
4Requesty$13,500.00
5Poe$13,636.36
6OrcaRouter$15,000.00
9OpenAI · Official$15,000.00
Switch to Impossibl to save $3,240.00/mo (22%)
Note: this is a gateway; verify availability and rate limits yourself.
Benchmark7 items
| Name | Conditions | Score | Metric | Source |
|---|---|---|---|---|
| BrowseComp | — | 90.1 | accuracy | Source ↗ |
| Humanity's Last Exam | variant: no tools | 43.1 | accuracy | Source ↗ |
| Humanity's Last Exam | variant: with tools | 57.2 | accuracy | Source ↗ |
| FrontierMath | dataset: Tier 1-3 | 52.4 | accuracy | Source ↗ |
| FrontierMath | dataset: Tier 4 | 39.6 | accuracy | Source ↗ |
| GDPval | — | 82.3 | wins or ties | Source ↗ |
| GeneBench | — | 33.2 | accuracy | Source ↗ |
The same benchmark scores very differently across harness / dataset, so the qualifying conditions must be shown together.
Reasoning control
effort = noneeffort = loweffort = mediumeffort = higheffort = maxbudget_tokenseffort = xhigh
Related models
GPT-5.5 Pro (OpenAI)same series$30.00 / $180GPT-5.4 Prosame series$30.00 / $180GPT-5.4 Pro (OpenAI)same series$30.00 / $180GLM-5.2cheaper alternative$1.40 / $4.40DeepSeek V4 Procheaper alternative$0.435 / $0.87DeepSeek V4 Flashcheaper alternative$0.14 / $0.28Kimi K3cheaper alternative$3.00 / $15.00
Price historyone sample accumulated per data sync
Input listOutput listMin blended