// model_detail
legacy reasoning
o1
by OpenAI
OpenAI's first reasoning model. Still available but superseded by o3.
Context window 200K 200K tokens
Max output 100K 100K tokens
Pricing /1M tok $15.00 in / $60.00 out per 1M tokens (API)
Released Dec 5, 2024
// specifications
Specs & capabilities
API details
- API model ID
o1- Internal ID
o1- Status
- legacy
- Type
- reasoning
Capabilities
- Vision
- 👁️ Yes
- Function calling
- 🔧 Yes
- Knowledge cutoff
- 📅 2024-10
Pricing
- Input
- $15.00 / 1M tokens
- Output
- $60.00 / 1M tokens
- Source
- First-party API pricing
Lifecycle
- Successor
- o3
// notes
Additional notes
Original reasoning model, premium priced
// more_from_openai
More OpenAI models
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GPT-5.4 Pro active reasoning
Highest-tier reasoning model with deep thinking. 1.1M context.
GPT-5.4 Mini active balanced
Smaller 5.4 variant for coding, computer use, and subagents. 1.1M context.
GPT-5.4 Nano active fast
Cheapest model in the GPT-5.4 family for high-volume simple tasks.
GPT-5.3 Chat active balanced
Chat-optimized variant of the GPT-5.3 series.
GPT-5.3 Codex active coding
OpenAI's latest coding-focused model. 91.5% LiveCodeBench. 400K context.
// external_links