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OpenAI o3-mini

Free

Pushing the frontier of cost-effective reasoning.

FreeFree tier
Inputs: textOutputs: text
Type
Open Source
Company
OpenAI
Visit Website GitHub (38 stars)

About OpenAI o3-mini

OpenAI o3-mini, released on January 31, 2025, is the newest and most cost-efficient reasoning model in OpenAI's reasoning series. It delivers exceptional STEM capabilities—particularly in science, math, and coding—while maintaining low cost and reduced latency compared to its predecessor o1-mini. Available in both ChatGPT and the API, o3-mini supports highly requested developer features such as function calling, Structured Outputs, developer messages, and streaming. Developers can choose from three reasoning effort options (low, medium, high) to optimize for speed or accuracy. It also works with search to provide up-to-date answers with web links. o3-mini replaces o1-mini in the model picker, offering tripled rate limits for Plus and Team users (150 messages per day) and is the first reasoning model made available to free ChatGPT users via the 'Reason' option. It does not support vision capabilities.

Key Features

Cost-efficient reasoning with strong STEM performance (science, math, coding)
Available in ChatGPT and API (Chat Completions, Assistants, Batch)
Supports function calling, Structured Outputs, developer messages, and streaming
Three reasoning effort options: low, medium, high
Works with search for up-to-date answers with web links
Tripled rate limits for Plus/Team users (150 messages per day)
Available for free ChatGPT users via 'Reason' mode
Replaces o1-mini in model picker with higher rate limits and lower latency

Pros & Cons

Pros
  • Cost-efficient and fast, outperforming o1-mini in accuracy and speed
  • Matches o1 performance on math and science benchmarks with medium effort
  • Flexible reasoning effort for optimizing speed vs. depth
  • Supports essential developer features out of the box
  • Available to free users, lowering access barriers to reasoning AI
  • Integrates with search for real-time, sourced answers
  • Higher rate limits than o1-mini for paid users
Cons
  • Does not support vision capabilities (use o1 for visual tasks)
  • Specialized for STEM and technical domains, less suitable for broad general knowledge
  • High reasoning effort may increase response time for complex tasks
  • API access initially limited to usage tiers 3-5
  • Enterprise access delayed until February

Best For

STEM reasoning and problem-solving (math, science, coding)Production-ready API development with advanced featuresQuick, cost-effective responses for latency-sensitive applicationsSearch-enhanced Q&A with up-to-date informationCompetition math (AIME level) and complex logical tasksBalanced speed-accuracy tasks using medium reasoning effort

FAQ

What is OpenAI o3-mini?
OpenAI o3-mini is the newest, most cost-efficient reasoning model from OpenAI, released January 31, 2025. It excels in STEM tasks like math, science, and coding, and is available in ChatGPT and the API.
How does o3-mini differ from o1?
o3-mini is a smaller, more cost-efficient reasoning model optimized for technical domains and speed, while o1 is a broader general knowledge reasoning model. o3-mini matches o1's performance on math and science benchmarks with medium reasoning effort.
Does o3-mini support vision?
No, o3-mini does not support vision capabilities. Developers should use OpenAI o1 for visual reasoning tasks.
Is o3-mini free to use?
Yes, free ChatGPT users can access o3-mini by selecting 'Reason' in the message composer. Paid users (Plus, Team, Pro) also have access, with higher rate limits.
What reasoning effort options are available?
Developers can choose from three reasoning effort levels: low, medium, and high. Low prioritizes speed, medium provides a balance, and high focuses on complex problem-solving.
What are the rate limits for o3-mini?
Plus and Team users get 150 messages per day with o3-mini, triple the 50 messages per day for o1-mini. Pro users have unlimited access. Free users have limited usage.