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GPT-5.5 Pro (OpenAI)
openai·openai/gpt-5.5-pro-2·GA·Closed·gpt-pro series
Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
At a glance
Reference price$30.00 / $180 per 1M
Cache read — · LLM Gateway
Lowest paid$30.00 / $180
LLM Gateway Gateway
Context1,050,000
Output limit128,000
Capabilities
✓ Reasoning✓ Tool useStructured 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 1 providers1 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| LLM Gateway openai/gpt-5.5-pro | 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
1LLM Gateway$15,000.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
effort = mediumeffort = higheffort = xhigh
Related models
GPT-5.5 Prosame 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 list $30.00Output list $180Min blended $67.50
Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-21). Each future sync adds a point, and once accumulated a line is drawn here.