GPT-5.4 ProvsGPT-5.5 Pro
Both language models, compared at each maker’s own API list prices. Every figure links to its source.
Compare at your usage
Every model priced for the same request8,000 tokens in, 2,000 out
| GPT-5.4 Pro on OpenAI API | GPT-5.5 Pro on OpenAI API | |
|---|---|---|
| Rate applied | Base rate | Base rate |
| Inputper 1M tokens | $30.00 | $30.00 |
| Outputper 1M tokens | $180.00 | $180.00 |
| Cost per request | $0.60 | $0.60 |
| Per 1,000 requests | $600.00 | $600.00 |
- GPT-5.4 Pro OpenAI API pricing · as of Nov 2, 2026
- GPT-5.5 Pro OpenAI API pricing · as of Nov 2, 2026
Every model is priced for the same request at its maker’s own list prices (each with its source and date), so bold marks the cheapest. A model that can’t serve the request is named, not ranked; a condition its seller doesn’t price says which rate was used.
Cost per request as prompts grow
2K tokens out, list price on each maker’s API. GPT-5.4 Pro charges $60.00 / $270.00 above 272K tokens. GPT-5.5 Pro charges $60.00 / $270.00 above 272K tokens.
- GPT-5.4 Pro · OpenAI API
- GPT-5.5 Pro · OpenAI API
Where each stands among all scored models
Each line runs from the lowest to the highest score on the board; the tick is the median.
- GPT-5.4 Pro
- GPT-5.5 Pro
Key differences
These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.
Full comparison
| GPT-5.4 Pro OpenAI | GPT-5.5 Pro OpenAI | |
|---|---|---|
| Overview | ||
| Released | Mar 5, 2026 | Apr 24, 2026 |
| Open weights | — | — |
| Knowledge cutoff | Aug 2025 | Dec 2025 |
| Specs | ||
| Context | 1.05M | 1.05M |
| Max input | 922K | 922K |
| Max output | 128K | 128K |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Reasoning | ||
| Reasoning efforts | medium, high, xhigh | medium, high, xhigh |
| Tool use | ||
| Structured output | — | |
| Pricing · per 1M tokens | ||
| Input price | $30.00 | $30.00 |
| Output price | $180.00 | $180.00 |
| Blended price (3 input : 1 output) | $67.50 | $67.50 |
| Pricing under conditions · per 1M tokens | ||
| Input price, long prompts | $60.00Prompts over 272K tokens | $60.00Prompts over 272K tokens |
| Output price, long prompts | $270.00Prompts over 272K tokens | $270.00Prompts over 272K tokens |
| Batch input price | $15.00Batch | $15.00Batch |
| Batch output price | $90.00Batch | $90.00Batch |
| Flex tier input price | $15.00Flex tier | $15.00Flex tier |
| Flex tier output price | $90.00Flex tier | $90.00Flex tier |
| Cited scores | ||
| Epoch Capabilities Index | 160.2 | 162.7 |
| Epoch AI · GPQA Diamond | 94.6% xhigh effort | — |
| Epoch AI · FrontierMath Tiers 1–3 | 82.5% xhigh effort | 87.7% xhigh effort |
Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.
Model details and sources
- GPT-5.4 Pro → Available
- GPT-5.5 Pro → Available
Cited scores
- Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · Epoch AI Benchmarking Hub data · CC BY 4.0 · as of Nov 5, 2026
- Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · Epoch AI Benchmarking Hub data · CC BY 4.0 · as of Oct 28, 2026
- Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · Epoch AI Benchmarking Hub data · CC BY 4.0 · as of Nov 4, 2026