OpenAI · Balanced
GPT 5 Pro
The highest performing version of the flagship model GPT 5 by OpenAI.
- Reasoning
- Vision
- Input
- Text, Images
- Output
- Text
- Reasoning effort
- high
- Discovery tier
- Balanced
Pricing
USD per 1M tokens- Input
- $15.00
- Output
- $120.00
- Cache read
- $1.50
Reference prices as published by the model provider. API example
Specifications
- Context window
- 400K
- Max output
- 128K
- Average output (7 days)
- 90 tokens
- Longer than 8% of 468 models
Side by side
GPT 5 Pro compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| GPT 5 ProOpenAIThis model | Web AnswerkagiRemove | |
|---|---|---|
| Provider | OpenAI | kagi |
| Discovery tier | Balanced | Balanced |
| Added | Oct 6, 2025 | Dec 23, 2025 |
| Limits | ||
| Context window | 400K | — |
| Max output | 128KBest | 32.77K |
| Average output | 90 tokens | — |
| Pricing, USD per 1M tokens | ||
| Input | $15.00 | $7.50Best |
| Output | $120.00 | $7.50Best |
| Cache read | $1.50 | — |
| Capabilities | ||
| Reasoning | Yes | No |
| Vision | Yes | No |
| Reasoning effort | high | — |
Public evaluations
Benchmarks
There are no public benchmark results for these models yet.
Developers
Use it through the API
Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.
curl https://www.noumen.xyz/api/v1/chat/completions \
-H "Authorization: Bearer $NOUMEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-5-pro",
"reasoning_effort": "high",
"messages": [{ "role": "user", "content": "Explain this stack trace." }]
}'import os
from openai import OpenAI
client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
model="openai/gpt-5-pro",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)OpenAI
Related models
Other OpenAI models, starting with the same family.