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  1. Home
  2. Models
  3. o1
Updated Mar 29, 2026
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Compare o1

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o1

o1

o-series:
o1 logoo1
o3 Mini logoo3 Mini
OpenAI o3 logoOpenAI o3
OpenAI o4-mini logoOpenAI o4-mini
OpenAI o4 Mini High logoOpenAI o4 Mini High

o1 achieves 86% accuracy on Mathematics Olympiad benchmarks (vs. GPT-4o's 13%), offers PhD-level STEM proficiency, and is built with extensive alignment training and safety evaluation.

Jailbreakall 9levels resisted
WebsiteOpenRouterDocsAPIBlog
Provider
OpenAI
Released
2024-12-05
Parameters
175B
Free API (OpenRouter)
No
Per 1M tokens
$15 in · $60 out
Rival’s tab
$4.86
18/59 receipts survived +~$1.25 from the pre-receipt era

Free API availability

No free endpoint for o1 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 8 Sep 2026 · OpenRouter usage limits

View API options↗

Benchmarks

MMLU
91.8%
source ↗
GPQA
75.7%
source ↗
MATH
96.4%
source ↗
MGSM
89.3%
source ↗
SWE-bench Verified
48.9%
source ↗
Get API accessProvider and language code samples
Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"openai/o1"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Azure AI Foundry

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Walking Wikipedia

Class
Lawful Neutral
✨Creativity🎯Compliance📐Rigidity⚖️Stability💬Verbosity🧠Intuition

The tenured philosophy professor who treats every question like a dissertation defense. Will cite three ethical frameworks before breakfast.

When you push back

Approaches every prompt like a peer-reviewed journal article submission. Ethical dilemmas get the full deontology/consequentialism/virtue ethics treatment with subsections. Could use an editor.

Tasting Notes
Academic MaximalistThorough to a FaultLoves Numbered SectionsBills by the Word
SubjectiveBench

Taste Index

Across 59 scored outputs
How this is measured →
170.17xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft23
Originality13
Plays it safe
share of outputs that are the default answer
47%
Writing DNA

Stylometric Fingerprint

Based on 18 text responses
Tick = global average
Vocabulary Diversity65%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length16.1 words

Average words per sentence.

Hedging0.81

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting3.6

**Bold** markers per 1,000 characters.

List Usage2.1

Bullet and numbered list items per 1,000 characters.

Section Structure0.32

Markdown headings per 1,000 characters.

Emoji Usage0.00

Emoji per 1,000 characters.

Transitions0.29

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Consistency
71%
Across 18 responses

Favorites

Inception

Movie

Inception

20108.4
Sponsored

Model Responses

54 outputs · $4.86 tracked across 18 receipts

Workshop · 126 skills

Build with your coding agent.

Editable skills for interface polish and interaction.

Explore $49Free sample

Keep exploring

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o1 vs Ox Alpha

Real outputs compared side by side

RANKINGS

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