o1 Preview API

openai/o1
New AI model from OpenAI for complex reasoning in science, coding, and mathematics.
Context
128K tokens
Input
$19.5 / 1M tokens
Output
$78 / 1M tokens
Released
Aug 7, 2025

How to use o1 Preview API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to openai/o1.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "openai/o1",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "openai/o1",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/o1","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

o1 Preview API Pricing

TypePrice
Input
$19.5 / 1M tokens
Output
$78 / 1M tokens
Cached input
$9.75 / 1M tokens

o1 Preview Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
SWE-bench Verified
48.9%
Resolving verified real GitHub issuesSourceJuly 12, 2026
GPQA Diamond
78%
Google-proof graduate science questions (hardest subset)SourceJuly 12, 2026
AIME 2025
79.2%
Competition mathematics (AIME), 2025SourceJuly 12, 2026
Intelligence
11.4
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Coding
34
Composite score across standardised coding evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Math
79.7
Composite score across standardised mathematics evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

o1 Preview vs other models

ModelInputOutputContextBest for
o1 Preview
This page
$19.5 / 1M tokens
$78 / 1M tokens
128K tokens
Reasoning + agents
$6.5 / 1M tokens
$39 / 1M tokens
1.05M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$0.65 / 1M tokens
$3.9 / 1M tokens
1.05M tokens
Reasoning + agents

Frequently asked questions

o1 Preview has a 128,000 tokens context window.

o1 Preview takes image, text as input and returns text.

Use openai/o1 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

o1 Preview became available on August 7, 2025.

o1 Preview is priced at input $19.5 / 1M tokens, output $78 / 1M tokens, cached input $9.75 / 1M tokens.

Yes, o1 Preview can stream responses as they are generated.

Yes, o1 Preview accepts image input alongside text.

o1 Preview was built by OpenAI.

It is a chat model from OpenAI built for complex reasoning in science, coding, and mathematics.

It is designed for tasks involving complex reasoning, such as scientific analysis, coding, and mathematics.

Yes, it supports tools and function calling along with structured outputs.

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