GPT Realtime 2.1
GPT Realtime 2.1 is OpenAI's language model with a 128K context window and up to 32K output tokens, available from 2 providers, starting at $4.00 / 1M input and $24.00 / 1M output. A speech-to-speech realtime LLM from OpenAI with improved alphanumeric recognition, silence handling, and interruption behavior over WebRTC and WebSocket.
Capabilities
Input3/5
Text✓
Image✓
Audio✓
Video·
PDF·
Output2/5
Text✓
Image·
Audio✓
Video·
Embedding·
Capabilities2/13
Reasoning·
Adaptive Reasoning·
Function Calling✓
Parallel Function Calling✓
Structured Outputs·
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·
Pricing by Provider
US Dollar ($)
Per 1M tokens
| Provider | Standard | |||||
|---|---|---|---|---|---|---|
| Input $ / 1M | Output $ / 1M | Cache Read $ / 1M | Audio In $ / 1M | Audio Out $ / 1M | Image In $ / 1M | |
| $4.00 | $24.00 | $0.4 | $32.00 | $64.00 | $5.00 | |
| $4.00 | $24.00 | $0.4 | N/A | N/A | N/A | |
Cost Calculator
US Dollar ($)
Preset:
Versions
| Version | Released | Context | Input / 1M | Output / 1M | Status |
|---|---|---|---|---|---|
| GPT-5.6 Sol | 1.1M | $5.00 | $30.00 | Available | |
| GPT-5.6 Terra | 1.1M | $2.50 | $15.00 | Available | |
| GPT-5.6 Luna | 1.1M | $1.00 | $6.00 | Available | |
| GPT-5.5 | 1.1M | $5.00 | $30.00 | Available | |
| GPT-5.4 Mini | 1.1M | $0.750 | $4.50 | Available | |
| GPT-5.4 Nano | 1.1M | $0.200 | $1.25 | Available | |
| GPT-5.4 | 1.1M | $2.50 | $15.00 | Available | |
| GPT-5.3 Codex | 400K | $1.75 | $14.00 | Available | |
| GPT-5.2 Codex | 400K | $1.75 | $14.00 | Available | |
| GPT-5.2 | 410K | $1.75 | $14.00 | Available | |
| GPT Realtime 2.1 | 128K | $4.00 | $24.00 | Current |