OpenAI · Legacy
GPT-5
Predecessor to the GPT-5.x family for reasoning, coding, and agentic tasks.
- Reasoning
-
- Speed
-
- Context window
- 400K
- 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
$1.25
Cache read price
$0.125
Cache write price
—
Output price
$10.00
Capabilities
- ✓ Function calling
- ✓ Vision
- ✓ Structured output
- – Extended reasoning
- ✓ Prompt caching
- ✓ Batch API
- ✓ Streaming
Limits & knowledge
- Context window
- 400K
- Max output
- 128K
- Knowledge cutoff
- Sep 2024
- Family
- GPT-5
Source & last check
Source: https://developers.openai.com/api/docs/models/gpt-5 · Verified on: May 25, 2026