OpenAI: GPT-5.1

Sharper GPT-5 generation for coding, product work, and tool-assisted tasks

Model lab: OpenAI
Model family: gpt

Modalitiestext, image → text

Context window400,000

Maximum output128,000

Input · Service tier flexUSD 0.5 / 1M tokens

Output · Service tier flexUSD 4 / 1M tokens

Try now View docs

Quickstart

Use your Moduck API Key, set the API base URL to https://api.moduck.ai/v1, and set the model parameter to moduck/openai/gpt-5-1.

import os
import requests

base_url = "https://api.moduck.ai/v1"
api_key = os.environ["MODUCK_API_KEY"]
model_id = "moduck/openai/gpt-5-1"

response = requests.post(
    f"{base_url}/chat/completions",
    headers={
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json",
    },
    json={
        "model": model_id,
        "messages": [{"role": "user", "content": "Hello!"}],
        "stream": False,
    },
    timeout=60,
)
response.raise_for_status()
print(response.json())

Use the familiar OpenAI-style chat request format to make model integration easier.

GPT-5.1 API Pricing

Type	Price information
Input · Service tier flex	USD 0.5 / 1M tokens
Output · Service tier flex	USD 4 / 1M tokens
Cached input · Service tier flex	USD 0.05 / 1M tokens

Benchmarks

High

Intelligence Index · v4.324.7

Coding Index49.4

Agentic Index—

Non-reasoning

Intelligence Index · v4.313.3

Coding Index—

Agentic Index—

Performance

Output speed108.15 tokens/s

Time to first token33.16 s

Time to first answer token—

End-to-end response time—

Measurement variant	Output speed	Time to first token	Time to first answer token	End-to-end response time
High	108.15 tokens/s	33.16 s	—	—
Non-reasoning	100.92 tokens/s	1.1 s	—	—

Performance trends

Throughput108.15 tok/sCurrent

Time to first token33.16 sCurrent

End-to-end latency7.0 sCurrent

Throughput

Current108.15 tok/s

Window average105.2 tok/s

Time to first token

Current33.16 s

Window average39.2 s

End-to-end latency

Current7.0 s

Window average7.5 s

Tail latency (P99)

Current14.8 s

Window average16.6 s

Prompt cache hit rate

Current19.4%

Window average22.9%

Error rate

Current0.0%

Window average0.1%

Availability

Uptime100%At least one provider responded

Availability100%Requests actually served

Error rate0%Share of failed requests

Served requests, hour by hour

24 hours agoNow

GPT-5.1 Compare models

Model	Input price	Output price	Context window	Capabilities
GPT-5.1This page	USD 0.5 / 1M tokens · Service tier flex	USD 4 / 1M tokens · Service tier flex	400,000	Text output · Reasoning · Tool calling
GPT-5.6 Cyber	USD 10 / 1M tokens	USD 60 / 1M tokens	400,000	Text output · Reasoning · Tool calling
GPT-5.3 Chat (latest)	USD 1.4 / 1M tokens	USD 11.2 / 1M tokens	128,000	Text output · Tool calling
GPT-5.2	USD 0.7 / 1M tokens · Service tier flex	USD 5.6 / 1M tokens · Service tier flex	400,000	Text output · Reasoning · Tool calling
GPT-5	USD 1 / 1M tokens	USD 8 / 1M tokens	400,000	Text output · Reasoning · Tool calling

Model specifications

Input: text, image
Output: text
Context window: 400,000
Maximum input: 272,000
Maximum output: 128,000
Release date: 2025-11-13
Attachments: Yes
Reasoning: Yes
Tool calling: Yes
Structured output: Yes
Temperature setting: Yes
Open weights: No

Frequently asked questions

What is GPT-5.1 for?

Sharper GPT-5 generation for coding, product work, and tool-assisted tasks

What inputs and outputs does GPT-5.1 support?

Recorded inputs: text, images; outputs: text.

How is GPT-5.1 priced?

The pricing table shows the current recorded Moduck price. For example: Input · Service tier flex USD 0.5 / 1M tokens; Output · Service tier flex USD 4 / 1M tokens. See the pricing table for all units, variants, and conditions.

What specifications are recorded for GPT-5.1?

Current model records list Context window 400,000 tokens; Maximum output 128,000 tokens.

What model parameter does the Quickstart use?

The example uses moduck/openai/gpt-5-1. This is a cataloged Moduck public or reserved ID; check your account’s available models before calling it.

Can I call this model through the Moduck API now?

This page has no verified Moduck API call for this model. A Quickstart example or reserved ID does not establish access; check the models available to your account.