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o1

FreemiumText to TextAPI

Summary

OpenAI's o1 trades speed for reasoning depth, letting the model think through hard problems before answering.

o1 is built around a single insight: some problems need deliberate, multi-step reasoning rather than pattern matching at scale. Before generating an answer, the model works through logic chains internally—visible to you—on math proofs, bug-heavy code, and scientific questions where a wrong answer is worse than a slow one. It costs roughly 2–3x more per token than GPT-4o and takes longer to respond, making it a specialist tool rather than a daily driver. The real catch is knowing when you actually need it; using o1 for a summarization task or casual question is like hiring a surgeon to tie your shoes.

Bottom line: *Use when correctness and transparent reasoning outweigh speed; skip for routine tasks or tight-deadline workflows.*

Pricing Plans

Per-tokenLast verified 2 weeks ago
Price
$15/1M input tokens, $60/1M output tokens (API); also available via ChatGPT Plus ($20/mo)
Cost per 1M Input
$15.00
Cost per 1M Output
$60.00
Free Tier
Limited access via ChatGPT free tier with usage caps; full access requires ChatGPT Plus (0/mo) or API with per-token billing

o1 Pro

$200per month

Premium tier with unlimited access to o1 model, GPT-4, and other advanced features for power users and organizations.

  • Unlimited o1 model access
  • Access to all GPT models
  • Highest priority processing
  • Advanced analytics and usage insights
  • Organizational collaboration features
  • Designed for heavy users and teams

View full pricing on openai.com →

Pricing may have changed since last verified. Check the official site for current plans.

Community Performance Report Card

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Best For: Research and academic applications, Advanced coding tasks and algorithm design, Scientific reasoning and data analysis, Complex problem decomposition, High-stakes accuracy requirements

LLM Spec Sheet

Specializations

CodeMathReasoningResearchScienceLong Context
Knowledge BaseTrained through October 2023

Benchmarks

92.3%MMLU
94.5%HumanEval
96.5%GPQA

Pricing & Limits

Input price
$15.00 / 1M tokens
Output price
$60.00 / 1M tokens
Max output tokens
32768.0000

Metrics from legacy-discovery, updated .

Community Benchmarks Community

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Changelog

  • Input price first recorded at $15.00/1M · legacy-discovery
  • Output price first recorded at $60.00/1M · legacy-discovery
  • MMLU first recorded at 92.3% · legacy-discovery
  • HumanEval first recorded at 94.5% · legacy-discovery
  • GPQA first recorded at 96.5% · legacy-discovery
  • Max output first recorded at 32.8k tokens · legacy-discovery
  • Superior reasoning capability on complex problems
  • State-of-the-art performance on STEM benchmarks
  • Transparent reasoning process for verification
  • Robust handling of multi-step logical inference
  • Strong code generation and technical reasoning
  • Slower inference time than standard LLMs due to reasoning overhead
  • Higher per-token cost reflects computational complexity
  • Optimized for reasoning tasks; may be overkill for simple queries

Community Reviews

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About

Platforms
Web, API
Languages
English
API Available
Yes
Self-Hosted
No
Last Updated
2026-04-08T13:00:40.152Z

Best For

Who it's for

  • Research and academic applications
  • Advanced coding tasks and algorithm design
  • Scientific reasoning and data analysis
  • Complex problem decomposition
  • High-stakes accuracy requirements

What it does well

  • Mathematical problem solving and proof verification
  • Complex software engineering and code debugging
  • Scientific research and hypothesis evaluation
  • Logic puzzles and constraint satisfaction problems
  • Advanced technical documentation analysis

Integrations

OpenAI API ecosystemChatGPT Plus interface

Discussion Community

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Frequently Asked Questions

Is o1 free?
o1 is a paid tool ($15/1M input tokens, $60/1M output tokens (API); also available via ChatGPT Plus ($20/mo)). No permanent free tier is offered.
Is o1 open source?
No — o1 is a closed-source tool. Source code is not publicly available.
Does o1 have an API?
Yes. o1 exposes a developer API. See the official documentation at https://openai.com for details.
What are the alternatives to o1?
Common alternatives include Claude 3 Opus, GPT-4, Gemini 2.0. Compare them on AIDiveForge for pricing, features, and platform support.
When was o1 released?
o1 was first released in 2024.
What platforms does o1 support?
o1 is available on: Web, API.

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Used in Workflow PacksComing soon — see which automation workflows use this tool.
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o1 represents a paradigm shift in LLM design, emphasizing deep reasoning and problem-solving over raw scale. Unlike traditional transformer models that generate responses token-by-token, o1 employs an internal reasoning process to work through problems methodically before generating an answer. This architecture enables superior performance on tasks requiring multi-step logic, mathematical proofs, and intricate code generation. The model demonstrates particularly strong capabilities in STEM domains, achieving top-tier results on benchmarks like AIME, GPQA, and coding challenges. o1 trades inference speed for accuracy, making it ideal for complex reasoning tasks where correctness is paramount. The model incorporates safety measures and constitutional AI principles in its reasoning process, ensuring outputs align with intended behaviors.