GPT-5.1
Flagship OpenAI reasoning model for complex coding and agentic work.
Input / 1M
$1.25
OpenAI
Output / 1M
$10.00
Cached input
$0.125
discounted reads
Context
400K
128K max output
Price history
input unchanged · verified 2h agoPrice changes
3 changes| Date | Field | From | To | Change | Source |
|---|---|---|---|---|---|
| 2026-09-13 | Input | — | $1.25 | — | seed |
| 2026-09-13 | Output | — | $10.00 | — | seed |
| 2026-09-13 | Cached input | — | $0.125 | — | seed |
Specifications
- Provider
- OpenAI
- Model ID
- gpt-5-1
- Modality
- text+image
- Context window
- 400K tokens
- Max output
- 128K tokens
- Tokenizer family
- o200k
Cost at similar prices
10,000 requests/month · 2000 in / 600 out tokens
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