OpenAI, proprietary
GPT-5.5 Pro
GPT-5.5 Pro by OpenAI ranks 8th of 354 ranked models on the Noometry Index as of October 2026, with a score of 64.3. Its strongest category is math, where it ranks 10th. API pricing starts at $30 per million input tokens and $180 per million output tokens, with a 1.05M-token context window.
Last verified
Specifications
- Noometry rank
- #8 of 354
- Index score
- 64.3
- Evidence
- Confirmed 14 results
- Provider
- OpenAI
- Released
- April 23, 2026
- Weights
- Proprietary
- Reasoning
- Yes
- Context window
- 1.05M
- Max output
- 128K
- Input price
- $30 / M
- Output price
- $180 / M
- Blended price
- $67.50 / M
- Output speed
- Not measured
- Value
- #215 of 219
- Knowledge cutoff
- December 2025
- Input
- text, image, pdf
Category scores
Each category score combines every public result we have in that category.
- Reasoning 73.3
- Math 84.0
- Knowledge 64.1
Strengths and weaknesses
Categories where GPT-5.5 Pro places highest and lowest among the models ranked in each, with its score against that category's median.
Closest competitors
The models ranked just above and below GPT-5.5 Pro. When scores are this close, price and speed are often the better way to choose.
| Model | Rank | Score | Blended $/M | Speed | |
|---|---|---|---|---|---|
| Claude Opus 5 | #4 | 67.8 | $10 | — | Compare |
| Claude Fable 5 | #5 | 66.8 | $20 | 25 | Compare |
| GPT-6.1 Sol | #6 | 65.6 | $4 | — | Compare |
| GPT-5.6 Sol | #7 | 65.0 | $8 | 10 | Compare |
| GPT-5.5 | #9 | 63.4 | $11.25 | 25 | Compare |
| Claude Sonnet 5.5 | #10 | 61.9 | $4 | — | Compare |
| Gemini 3.8 Flash | #11 | 61.8 | $1.50 | — | Compare |
| GPT-6 Sol | #12 | 61.8 | $4 | — | Compare |
Sponsored placements are available on pages like this one. Advertise on Noometry
Benchmark results
Every published result we track, with its source. Bold rows are the ones used for ranking; where several exist we prefer independent runs over self-reported numbers.
Reasoning
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| ARC-AGI-2 | 84.6% | #13 of 83, top 16% | high | Epoch AI | |
| ARC-AGI-2 | 84.2% | xhigh | Epoch AI | ||
| SimpleBench | 76.9% | #4 of 77, top 6% | Epoch AI | ||
| SimpleBench | 76.9% | high | Epoch AI | ||
| ARC-AGI-1 | 96.5% | #10 of 83, top 13% | high | Epoch AI | |
| ARC-AGI-1 | 95% | xhigh | Epoch AI | ||
| CritPt | 30.6% | #8 of 134, top 6% | xhigh | Epoch AI | |
| Chess Puzzles | 64% | #2 of 129, top 2% | xhigh | Epoch AI | 2026-05-01 |
| DTBench | 96% | #13 of 151, top 9% | xhigh | Epoch AI | |
| LMCA | 53.9% | #13 of 125, top 11% | xhigh | Epoch AI | |
| Epoch Capabilities Index | 162.07 | #8 of 213, top 4% | Epoch AI | 2026-04-23 |
Math
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | #8 of 81, top 10% | xhigh | Epoch AI | 2026-06-12 |
| FrontierMath Tier 4 | 78% | #9 of 63, top 15% | xhigh | Epoch AI | 2026-06-12 |
| OTIS Mock AIME 2024-2025 | 100% | #6 of 173, top 4% | xhigh | Epoch AI | 2026-04-24 |
| FrontierMath (Feb 2025 set) | 52.4% | Best of 68 | high | Epoch AI | 2026-04-23 |
| FrontierMath (Feb 2025 set) | 51% | xhigh | Epoch AI | 2026-04-23 | |
| FrontierMath Tier 4 (v1) | 39.6% | #2 of 55, top 4% | high | Epoch AI | 2026-04-23 |
| FrontierMath Tier 4 (v1) | 39.6% | xhigh | Epoch AI | 2026-04-23 |
Knowledge
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| GPQA Diamond | 93.9% | #12 of 186, top 7% | xhigh | Epoch AI | 2026-04-24 |
API pricing by provider
| Route | Input $/M | Output $/M | Cached input $/M | Checked |
|---|---|---|---|---|
| openai | $30 | $180 | — | 2026-10-10 |
| openrouter | $30 | $180 | — | 2026-10-10 |
Compare GPT-5.5 Pro
- GPT-5.5 Pro vs GPT-5.4 Pro
- GPT-5.5 Pro vs GPT-5.6 Sol
- GPT-5.5 Pro vs GPT-5.5
- GPT-5.5 Pro vs GPT-6.1 Sol
- GPT-5.5 Pro vs Claude Sonnet 5.5
- GPT-5.5 Pro vs Claude Fable 5
- GPT-5.5 Pro vs Gemini 3.8 Flash
- GPT-5.5 Pro vs Claude Fable 5.1
- GPT-5.5 Pro vs Kimi K3
- GPT-5.5 Pro vs Grok 4.6
- GPT-5.5 Pro vs Qwen3.8 Max
- GPT-5.5 Pro vs GLM-5.3
- GPT-5.5 Pro vs Muse Spark 1.3
- GPT-5.5 Pro vs DeepSeek V4 Pro
Other OpenAI models
- GPT-6 Astra70.8
- GPT-6.1 Sol65.6
- GPT-5.6 Sol65.0
- GPT-5.563.4
- GPT-6 Sol61.8
- GPT-5.459.4
- GPT-5.6 Terra59.2
- GPT-5.4 Pro58.9
Frequently asked questions
How good is GPT-5.5 Pro?
GPT-5.5 Pro by OpenAI ranks 8th of 354 ranked models on the Noometry Index as of October 2026, with a score of 64.3. Its strongest category is math, where it ranks 10th. API pricing starts at $30 per million input tokens and $180 per million output tokens, with a 1.05M-token context window.
How much does GPT-5.5 Pro cost?
GPT-5.5 Pro costs $30 per million input tokens and $180 per million output tokens on OpenAI's own API.
What is GPT-5.5 Pro's context window?
GPT-5.5 Pro accepts up to 1.05M tokens of input and can write up to 128K tokens in one response.
Is GPT-5.5 Pro open source?
No. GPT-5.5 Pro is proprietary and available only through OpenAI's API and partner platforms.
What are GPT-5.5 Pro's strengths and weaknesses?
Relative to other ranked models, GPT-5.5 Pro places best in reasoning and lowest in knowledge.
What is GPT-5.5 Pro best at?
Its best category is math, where it ranks 10th on Noometry.