OpenAI · Released Jan 31, 2025o3-mini
Smaller o-series reasoner for economical coding, math, and planning tasks.
- Capability
- 140.3ECI · #98 of 148
- Input
- $1.10per 1M tokens
- Output
- $4.40per 1M tokens
- Context
- 200K100K max output
What it costs
- Input
- $1.10per million tokens
- Output
- $4.40per million tokens
- Cached input
- $0.55per million tokens
- Blended (3:1)
- $1.93pricier than 69% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $4.40 |
| Team assistant25M input + 5M output tokens | $49.50 |
| Production app250M input + 50M output tokens | $495.00 |
Official OpenAI API price, as listed on models.dev.
Independent benchmarks
#98 of 148 scored models
The shaded band is Epoch AI’s confidence range (137.4–141.9); the tick marks the median scored model.
Scores from Epoch AI, run independently of OpenAI.
The details
- Lab
- OpenAI
- Released
- Jan 31, 2025
- Knowledge cutoff
- May 2024
- Context window
- 200,000 tokens
- Max output
- 100,000 tokens
- Inputs
- Text
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
o3-minion OpenAI- Availability
- 15 API providerslisted on models.dev
- Status
- Deprecated by the provider
What OpenAI claims
Published by the lab at launch. Settings vary, so compare these only with care.
| Benchmark | Score | Setting | Source |
|---|---|---|---|
| Aider Polyglot | 60.4 percent correct | — | Source |
More from OpenAI
About o3-mini
How much does o3-mini cost?
o3-mini costs $1.10 input / $4.40 output per million tokens (official OpenAI API price). Cached input is $0.55 per million tokens. At a 3:1 input-to-output mix that is $1.93 per million tokens, more expensive than 69% of the 360 priced models we track.
What is the context window of o3-mini?
o3-mini accepts up to 200,000 tokens per request and can write up to 100,000 tokens in one response.
How good is o3-mini?
Epoch AI gives o3-mini a Capabilities Index score of 140.3 (likely range 137.4–141.9), ranking it #98 of 148 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 77.0%, FrontierMath Tiers 1–3 18.6%, OTIS Mock AIME 2024–2025 76.9%, SimpleQA Verified 15.3%.
Is o3-mini open source?
No. o3-mini is proprietary; you use it through OpenAI’s API or partner platforms.
What inputs does o3-mini support?
o3-mini accepts text and replies in text. It is a reasoning model with low, medium and high effort settings, supports tool calling and can return structured JSON output.
When was o3-mini released?
OpenAI released o3-mini on Jan 31, 2025. Its training data runs to May 2024.
What are the best alternatives to o3-mini?
The closest current models from other labs on capability, price and release date are DeepSeek-R1 (DeepSeek, ECI 139.0, $0.70 / $2.60), Qwen3 235B-A22B (Alibaba (Qwen), ECI 139.4, $0.70 / $2.80), Claude Haiku 4.5 (Anthropic, ECI 142.4, $1.00 / $5.00) and Gemini 2.5 Flash (Google, ECI 140.8, $0.30 / $2.50).