OpenAI · Legacy
o3
Reasoning model for math, science, coding, and visual reasoning tasks. Succeeded by GPT-5.
- Reasoning
-
- Speed
-
- Context window
- 200K
- Input
-
Text input supportedImage input supportedAudio input not supportedVideo input not supported - Output
-
Text output supportedImage output not supportedAudio output not supportedVideo output not supported
Pricing
per 1M tokens
Input price
$2.00
Cache read price
$0.50
Cache write price
—
Output price
$8.00
Capabilities
- ✓ Function calling
- ✓ Vision
- ✓ Structured output
- ✓ Extended reasoning
- ✓ Prompt caching
- ✓ Batch API
- ✓ Streaming
Limits & knowledge
- Context window
- 200K
- Max output
- 100K
- Knowledge cutoff
- Jun 2024
- Family
- o-series
Source & last check
Source: https://developers.openai.com/api/docs/models/o3 · Verified on: May 25, 2026