OpenAI · Frontier
GPT-4o
OpenAI's flagship multimodal model, handling text, images, and audio. Exceptional at understanding context and generating human-like responses.
- Tools
- Vision
- Input
- Text, Images
- Output
- Text
- Discovery tier
- Frontier
Pricing
USD per 1M tokens- Input
- $2.50
- Output
- $10.00
- Cache read
- $1.25
Reference prices as published by the model provider. API example
Specifications
- Context window
- 128K
- Max output
- 16.4K
- Average output (7 days)
- 101 tokens
- Longer than 10% of 468 models
Side by side
GPT-4o compared
Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.
| GPT-4oOpenAIThis model | GPT 5.1OpenAIRemove | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Discovery tier | Frontier | Frontier |
| Added | May 13, 2025 | Nov 13, 2025 |
| Limits | ||
| Context window | 128K | 400KBest |
| Max output | 16.38K | 128KBest |
| Average output | 101 tokens | 294 tokens |
| Pricing, USD per 1M tokens | ||
| Input | $2.50 | $1.25Best |
| Output | $10.00 | $10.00 |
| Cache read | $1.25 | $0.13Best |
| Performance | ||
| Throughput | 69.2 tok/s | — |
| Time to first token | 1.4 s | — |
| Request success (24h) | 100.0% | 100.0% |
| Benchmark indexes | ||
| Intelligence Index | 8.4 | 13.3Best |
| Math Index | 6.0 | 38.0Best |
| Capabilities | ||
| Reasoning | No | Yes |
| Tools | Yes | Yes |
| Vision | Yes | Yes |
| Structured output | No | Yes |
| PDF input | No | Yes |
| Reasoning effort | — | none, low, medium, high |
Public evaluations
Benchmarks
Independent evaluation results, with how each score ranks among the models in the Noumen catalog.
- GPT-4o
- GPT 5.1
Intelligence Index
- GPT-4o8.4
- GPT 5.113.3
GPT-4o: Better than 13% of 326 scored models
Indexes
Math Index
Composite of the math evaluations
- GPT-4o: 6.0
- GPT 5.1: 38.0Top
Document reasoning
AA-LCRv1.1
Reasoning across long documents
- GPT-4o: 49.3%Top
- GPT 5.1: 45.0%
Reasoning and knowledge
Humanity’s Last Exam
Expert-level questions across academic fields
- GPT-4o: 2.4%
- GPT 5.1: 5.3%Top
GPQA Diamond
Graduate-level science questions
- GPT-4o: 54.3%
- GPT 5.1: 64.3%Top
MMLU-Pro
Multi-subject knowledge and reasoning
- GPT-4o: 74.8%
- GPT 5.1: 80.1%Top
IFBench
Following precise output instructions
- GPT-4o: 34.3%
- GPT 5.1: 43.2%Top
Coding
LiveCodeBench
Recent competitive programming problems
- GPT-4o: 30.9%
- GPT 5.1: 49.4%Top
Math
AIME 2025
Competition mathematics, 2025 problems
- GPT-4o: 6.0%
- GPT 5.1: 38.0%Top
AIME
Competition mathematics
- GPT-4o: 15.0%
- GPT 5.1: —
MATH-500
Competition math problems
- GPT-4o: 75.9%
- GPT 5.1: —
Legacy evaluations
Terminal-Bench Hard
Earlier terminal task suite
- GPT-4o: 8.3%
- GPT 5.1: 22.7%Top
τ²-Bench Telecom
Tool use in a customer-support simulation
- GPT-4o: 25.1%
- GPT 5.1: 46.5%Top
AA-LCR (unversioned)
Long-context reasoning, earlier grading
- GPT-4o: 49.3%Top
- GPT 5.1: 45.0%
Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis
- GPT-4o
- GPT 5.1
| Leaderboard | GPT-4o | GPT 5.1 |
|---|---|---|
| Vision Style Control · Creative Writing | Not in top 20 | #3 · 1284.6 |
| Vision Style Control · Captioning | Not in top 20 | #4 · 1248.2 |
| Vision Style Control · Entity Recognition | Not in top 20 | #11 · 1228.2 |
Ranks among Noumen catalog models on LMArena leaderboards. Only top-20 placements are listed.LMArena
Live routing data
Performance and reliability
Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.
- Throughput
- 69.2 tok/s
- Faster than 45% of 254 models
- Time to first token
- 1.4 s
- Quicker than 92% of 254 models
- Prompt cache hits
- 56.8%
- About $1.79 per 1M input tokens with caching
- Request success (24h)
- 100.0%
- Reliable
Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.
- Healthy (98% or more)
- Degraded (90–98%)
- Down (under 90%)
- No requests
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-4o",
"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-4o",
messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)OpenAI
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