Model · OpenAI · Reasoning
o4-mini
OpenAI's small reasoning model. Faster and cheaper than o3 while keeping the chain-of-thought architecture; the practical default for routine reasoning tasks.
- Modality
- Reasoning
- License
- Proprietary (Proprietary)
- Context window
- 200,000 tokens
- Released
- April 16, 2025
- Last verified
- June 8, 2026
- Runs locally
- No
Strengths
- Much cheaper than o3 with most of the reasoning quality
- Lower latency makes it usable in interactive flows
Weaknesses
- Less depth than o3 on the hardest problems
- Closed weights
Try it
| Where | Type | Notes |
|---|---|---|
| OpenAI API | hosted-api | API key required |
| ChatGPT | product | Free / paid tiers |
Version history
- o3 Apr 2025
- o4-mini Apr 2025 Current Deprecated
Official sources
- Model docs docs
Change log
- — Deprecated — superseded by GPT-5.4 mini; OpenAI API shutdown 2026-10-23.
- — Initial entry.
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