GPT-5.5 (xhigh)
By OpenAI · released 2026-04-23 (2 months) · snapshot 2026-07-17
- Intelligence index
- 54.80
- Cost to run the AA index
- $2778
- Price per 1M tokens (in / out)
- $5.00 / $30.0
- End-to-end time
- 95.2s
Is GPT-5.5 (xhigh) on the Pareto frontier, and what beats it?
Off the frontier
No. GPT-5.6 Sol (xhigh) is at least as smart for the same money or less.
Next step up: GPT-5.6 Sol (max), smarter but dearer.
| # | Model | Creator | Intelligence | Total cost | E2E total | Open | Released | Frontier |
|---|---|---|---|---|---|---|---|---|
| 1 | GPT-5.5 (xhigh) | OpenAI | 54.80 | $2778 | 95.2s | 2026-04-23 | ||
| 2 | GPT-5.6 Sol (xhigh) | OpenAI | 57.70 | $1543 | 50.0s | 2026-07-09 | Frontier | |
| 3 | GPT-5.6 Sol (max) | OpenAI | 58.90 | $2824 | 148.1s | 2026-07-09 | Frontier |
Open in the picker Daily check URL: 200 on the frontier, 409 once beaten
GPT-5.5 (xhigh) today
Intelligence: Artificial Analysis Intelligence Index. Cost: total cost to run that benchmark, so reasoning tokens count. API id: gpt-5-5.
Compare head to head
Suggested: what beats it, its effort levels, and frontier models near its price.
- GPT-5.5 (xhigh) vs GPT-5.6 Sol (xhigh)
- GPT-5.5 (xhigh) vs GPT-5.6 Sol (max)
- GPT-5.5 (xhigh) vs GPT-5.5 (Non-reasoning)
- GPT-5.5 (xhigh) vs GPT-5.5 (low)
- GPT-5.5 (xhigh) vs GPT-5.5 (medium)
- GPT-5.5 (xhigh) vs GPT-5.5 (high)
- GPT-5.5 (xhigh) vs GPT-5.6 Sol (high)
- GPT-5.5 (xhigh) vs Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
What the GPT-5.5 release did to the frontier on 2026-04-23
4 of 5 effort levels reached the frontier at launch (GPT-5.5 (low), GPT-5.5 (medium), GPT-5.5 (high), GPT-5.5 (xhigh)). Impact 3.27, #9 of 34 releases this past year.
Should you use GPT-5.5 (xhigh)?
Should you use GPT-5.5 (xhigh)?
Only when it fits your setup: GPT-5.6 Sol (xhigh) is at least as smart for the same money or less, so GPT-5.5 (xhigh) is off the value frontier today.
What is better and cheaper than GPT-5.5 (xhigh)?
GPT-5.6 Sol (xhigh) — at least as smart for the same money or less.
How much does GPT-5.5 (xhigh) cost?
$5.00/$30 in/out per 1M tokens, and $2778 to run the full Artificial Analysis Intelligence Index, the honest all-in number for reasoning models.
Is GPT-5.5 (xhigh) on the Pareto frontier?
No: GPT-5.6 Sol (xhigh) beats it on intelligence, cost, or both.
Frontier membership by axis pair
Other axis pairs where GPT-5.5 (xhigh) is Pareto-optimal.
| Y axis | X axis | On the frontier |
|---|---|---|
| AA intelligence index | AA total cost to run (USD) | |
| AA intelligence index | End-to-end total seconds | |
| AA intelligence index | Output speed tokens/sec |
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/models/gpt-5-5 · Markdown: /api/v1/models/gpt-5-5?format=md · llms.txt · agent skill